- Features
- Time-series native · Telegraf · IoT metrics
- Free tier
- Free plan
- Est. monthly
- $2.00/mo
Cloud & APIs
Developer infrastructure
Estimated monthly cost at typical usage. Open a tool to tweak usage.
Databases & Vector · at 1,000 GB written
| InfluxDB Cloud | Time-series native · Telegraf · IoT metrics | Free plan | $2.00/mo |
| Cloud Firestore | Realtime sync · Offline support · Firebase SDKs | 50K reads/day | $3.06/mo |
| Chroma Cloud | Open source · Simple Python API · Embeddings-first | $5 free credits | $6.60/mo |
| MongoDB Atlas | Document model · Atlas Search · Vector search | 512 MB shared cluster | $8.00/mo |
| Neon | Serverless Postgres · Branching · Autoscaling | 0.5 GB, scale to zero | $12/mo |
| Upstash Redis | Serverless Redis · Per-request pricing · Global replication | 500K commands/mo | $19/mo |
| Qdrant Cloud | Rust vector engine · Filtering | 1 GB cluster | $22/mo |
| Tembo | Postgres extensions · Stacks · Managed Postgres | Hobby tier | $23/mo |
| Supabase | Postgres + Auth + Storage · Realtime · pgvector | 500 MB, 2 projects | $27/mo |
| Weaviate Cloud | Built-in vectorizers · GraphQL | 14-day sandbox | $27/mo |
| Fauna | Distributed transactions · FQL · Serverless | Free plan | $30/mo |
| Couchbase Capella | JSON + SQL++ · Mobile sync · Memory-first | Free tier cluster | $30/mo |
| Dragonfly Cloud | Redis-compatible · Multi-threaded · High throughput | Trial credits | $32/mo |
| Timescale Cloud | Postgres time-series · Compression · Continuous aggregates | 30-day trial | $39/mo |
| Redis Cloud | Official Redis · Modules · Active-active | 30 MB free | $40/mo |
| Zilliz Cloud (Milvus) | Open-source Milvus · Billion-scale vectors · GPU index | Free cluster | $40/mo |
| PlanetScale | Vitess MySQL & Postgres · Deploy requests | None | $54/mo |
| Pinecone | Serverless vector DB · Hybrid search | 2 GB starter | $57/mo |
| ClickHouse Cloud | Columnar OLAP · Sub-second analytics · SQL | Trial credits | $90/mo |
- Features
- Realtime sync · Offline support · Firebase SDKs
- Free tier
- 50K reads/day
- Est. monthly
- $3.06/mo
- Features
- Open source · Simple Python API · Embeddings-first
- Free tier
- $5 free credits
- Est. monthly
- $6.60/mo
- Features
- Document model · Atlas Search · Vector search
- Free tier
- 512 MB shared cluster
- Est. monthly
- $8.00/mo
- Features
- Serverless Postgres · Branching · Autoscaling
- Free tier
- 0.5 GB, scale to zero
- Est. monthly
- $12/mo
- Features
- Serverless Redis · Per-request pricing · Global replication
- Free tier
- 500K commands/mo
- Est. monthly
- $19/mo
- Features
- Rust vector engine · Filtering
- Free tier
- 1 GB cluster
- Est. monthly
- $22/mo
- Features
- Postgres extensions · Stacks · Managed Postgres
- Free tier
- Hobby tier
- Est. monthly
- $23/mo
- Features
- Postgres + Auth + Storage · Realtime · pgvector
- Free tier
- 500 MB, 2 projects
- Est. monthly
- $27/mo
- Features
- Built-in vectorizers · GraphQL
- Free tier
- 14-day sandbox
- Est. monthly
- $27/mo
- Features
- Distributed transactions · FQL · Serverless
- Free tier
- Free plan
- Est. monthly
- $30/mo
- Features
- JSON + SQL++ · Mobile sync · Memory-first
- Free tier
- Free tier cluster
- Est. monthly
- $30/mo
- Features
- Redis-compatible · Multi-threaded · High throughput
- Free tier
- Trial credits
- Est. monthly
- $32/mo
- Features
- Postgres time-series · Compression · Continuous aggregates
- Free tier
- 30-day trial
- Est. monthly
- $39/mo
- Features
- Official Redis · Modules · Active-active
- Free tier
- 30 MB free
- Est. monthly
- $40/mo
- Features
- Open-source Milvus · Billion-scale vectors · GPU index
- Free tier
- Free cluster
- Est. monthly
- $40/mo
- Features
- Vitess MySQL & Postgres · Deploy requests
- Free tier
- None
- Est. monthly
- $54/mo
- Features
- Serverless vector DB · Hybrid search
- Free tier
- 2 GB starter
- Est. monthly
- $57/mo
- Features
- Columnar OLAP · Sub-second analytics · SQL
- Free tier
- Trial credits
- Est. monthly
- $90/mo
6 of 19
Email APIs · at 0 emails
| ZeptoMail | Exclusively transactional email sending to protect domain and IP reputation · Credit-based pay-as-you-go pricing with no monthly subscription lock-in (credits valid for 6 months) · Integration via RESTful APIs and SMTP relay with SDK support for multiple languages · Comprehensive email logs, suppression list management, and delivery analytics | 10,000 free email credits on account signup, valid for 6 months | $0/mo |
| Courier | Multi-channel routing across email, SMS, push, in-app inbox, Slack, Teams, and WhatsApp via a single API · Drop-in notification center and toasts for web and mobile applications · Visual template builder and journey workflows with automatic provider failover across 50+ integrations · Developer and AI tooling including official MCP server, CLI, and client/server SDKs · Pay-as-you-go pricing at $0.005 per send on all channels with no per-seat fees | Developer plan includes 10,000 free sends per month with journeys, broadcasts, SDKs, CLI, and MCP server support. | $0/mo |
| Inboxroad | SMTP relay and REST APIs for marketing and transactional emails · Dedicated IP addresses with automated IP warm-up schedules · Per-ISP send-rate controls and integrated Feedback Loops (FBLs) · Drag-and-drop campaign email builder and HTML editor · Real-time event webhooks and delivery monitoring | 1,000 free emails per month | $0/mo |
| UniOne | Email delivery via RESTful Web API and SMTP API · Dynamic templating supporting Liquid, Velocity, and Simple template engines · Drag-and-drop email builder with AI HTML editor and 200+ pre-built templates · Real-time event webhooks, click/open tracking, and up to 100 days of analytics storage · Integrated email validation API and automatic suppression list management | 4-month free trial with 6,000 emails/month and 100 email validations; free testing tier allows up to 100 emails/day to v | $4.00/mo |
| Shipmail | Custom-domain email with webmail, IMAP, SMTP, and JMAP support · REST API, webhooks, and MCP server for AI agent integration · Shared inboxes, calendars, contact management, and booking features · 15–25 GB of storage per mailbox | None (14-day free trial, credit card required) | $4.00/mo |
| Bavimail | Unified REST API and SDKs (TypeScript and Python) for outbound and inbound email · Per-agent dedicated inboxes and official MCP server integration for AI agents · Automated domain authentication setup and verification for SPF, DKIM, and DMARC · Signed webhooks across email lifecycle and delivery events | Free tier includes 6,000 monthly emails (capped at 200 daily outbound sends), 3 inboxes per domain, 0.5 GB retained stor | $5.00/mo |
| Dead Simple Email | Programmatic inbox provisioning via REST API, SDKs, and native Model Context Protocol (MCP) server support · Inbound prompt-injection risk scoring and structured JSON reply parsing · Real-time event streaming and delivery via HMAC-signed webhooks, WebSockets, and SSE · Custom domain support with automatic SPF, DKIM, and DMARC configuration | 5 inboxes and 5,000 emails per month with no credit card required. | $5.00/mo |
| SendPulse Transactional Email | Supports SMTP relay and REST API integration · Generous free tier offering 12,000 emails per month · SPF, DKIM, and DMARC domain authentication support · Delivery statistics, unsubscribe management, and webhook notifications · Dedicated IP addresses available on higher-tier plans | 12,000 emails/month (rate-limited to 50 emails/hour, up to 2 sending domains) | $8.85/mo |
| Mailjet | Send transactional and marketing emails via Send API v3.1 or SMTP relay · Real-time event webhooks for opens, clicks, bounces, spam complaints, and blocks · Responsive email builder with support for MJML open-source markup · Contact list management, email address validations, and inbox preview testing | Free plan includes 6,000 emails per month capped at 200 emails per day, with up to 1,000 contacts, API/SMTP relay access | $9.00/mo |
| Moosend | Unlimited email campaigns and sends on paid plans · Visual drag-and-drop email automation workflow builder · Built-in landing page and subscription form builders · Real-time analytics and reporting tools | None | $9.00/mo |
| Campaign Monitor | Drag-and-drop email builder with custom HTML template import · Visual customer journey automation and drip campaigns · Built-in transactional email sending with REST API integration · A/B testing, inbox preview, and spam testing tools · Send time optimization and engagement-based segmentation on higher tiers | 30-day free trial for up to 500 contacts and 500 email sends | $13/mo |
| turboSMTP | High-deliverability SMTP relay and developer REST APIs · Real-time analytics for opens, clicks, unsubscribes, and bounces · 24/7 customer support via ticket, live chat, and phone · Integrated email validation and custom tracking domain configuration | 6,000 emails per month (capped at 200 emails per day) with no credit card required | $15/mo |
| SMTP2GO | SMTP relay and RESTful API integration with global data centers · Real-time analytics and tracking for delivery, opens, clicks, bounces, and spam complaints · Email overage support allowing sending up to 3x plan limits on paid tiers · Subaccount management and unlimited team members on all paid plans · Dedicated IP included on Professional plans starting at 100,000 emails/month | 1,000 emails/month (capped at 200 emails/day), 5 days of reporting, ticket support, and no credit card required. | $15/mo |
| Amazon SES | Usage based · AWS integration · Dedicated IP options | AWS Free Tier credits may apply | $16/mo |
| Omnisend | Ecommerce-tailored automations for cart abandonment, order confirmations, and win-back flows · Multi-channel support including email, SMS, and web push notifications · Extensive REST API for managing contacts, custom events, orders, and campaigns · Dynamic product recommendation and discount code content blocks | Free for up to 250 contacts and 500 emails/month with access to core automations, templates, and signup forms. | $16/mo |
| Elastic Email | REST API and SMTP relay for transactional and marketing email delivery · SDKs and client libraries for 12 programming languages · Drag-and-drop template designer and built-in email verification · Real-time deliverability analytics, webhooks, and suppression management | Free tier includes up to 3,000 emails per month with a daily send limit of 100 emails. | $19/mo |
| GetResponse | Unlimited email sends across all standard paid tiers · Visual marketing automation workflows and autoresponders · Drag-and-drop landing page and website builders with AI features · Built-in webinar hosting and conversion funnel tools · Comprehensive REST API, webhooks, and ecommerce integrations | Free plan includes up to 500 contacts, 2,500 emails per month, and access to basic marketing tools. | $19/mo |
| Mandrill | Send transactional emails via REST API or SMTP credentials · Sold in blocks of 25,000 emails with volume discounts from $20 down to $10 per block · Inbound email processing and real-time event webhooks · Custom domain whitelabeling, dedicated IPs, and rules engine | Up to 500 free demo/test email sends to a verified domain for new users. | $20/mo |
| Mails.ai | Inbound email parsing delivered as structured JSON with automatic prompt-injection detection · Automatic email thread reconstruction and conversation handling via REST, SSE, or webhooks · Native Model Context Protocol (MCP) server support alongside TypeScript and Python SDKs · Per-agent reputation monitoring and send limits with cold outreach enforcement | 3,000 events/month, 1 agent, sending via workspace subdomain, MCP server access, and SDKs with no credit card required | $20/mo |
| Nitrosend | Native support for AI agents via Model Context Protocol (MCP), REST API, and CLI · Unified sending for newsletters, transactional emails, and automated lifecycle flows · Unlimited contacts included on all plans with pricing based solely on send volume · Automated brand kit formatting and AI copywriting powered by NitroWheel LLM · Support for bringing your own sending infrastructure (e.g., SES, Mailgun) and AI API keys | 8,000 starter emails up front, then 500 emails/month with unlimited contacts, 1 seat, and full MCP/API/CLI access | $20/mo |
| Waypoint | Block-based visual template builder supporting Liquid syntax, conditional logic, loops, and test data · Detailed observability with complete message logs including rendered HTML, variables, and delivery event timeline · Unlimited team members with no per-seat fees on all plans · Purposely designed for transactional emails with curated IP pools to maintain high deliverability | None (sandbox/free trial only; no ongoing free tier for live sending) | $20/mo |
| Mailshake | Automated cold email sequencing with personalized follow-ups · Unlimited email warmup and automated email verification · AI email writing assistant and campaign A/B testing · CRM integrations with Salesforce, HubSpot, and Pipedrive | None | $29/mo |
| Scaleway Transactional Email | European cloud · Data residency · Transactional API | Usage-based | $30/mo |
| Novu | Unified multi-channel orchestration across email, in-app inbox, SMS, push, and chat · Pre-built embeddable Inbox component and subscriber preference management · Workflow engine supporting digests, delays, conditional logic, and provider integrations · Open-source core with options for cloud hosting or self-hosted deployment | Free tier includes 10,000 workflow runs per month across all channels, up to 20 workflows, 2 environments, and up to 3 t | $30/mo |
| Woodpecker | Unlimited email accounts and unlimited team members included on all tiers · Built-in deliverability features including automated warm-up, inbox rotation, and adaptive human-like sending · Real-time email list verification and catch-all validation included at no extra cost · Condition-based sequences with automated follow-ups and LinkedIn outreach steps · Developer ecosystem including REST API, webhooks, Model Context Protocol (MCP) server, and CLI | None (offers a 14-day free trial with up to 100 cold emails) | $35/mo |
| SocketLabs | Cloud SMTP relay service and REST email injection API · StreamScore deliverability scoring and reporting analytics · Inbound email stream parsing and real-time webhook event notifications · Configurable overage protection and automated IP warmup | None (offers a 1-month free trial with 40,000 emails, no credit card required) | $40/mo |
| Saleshandy | Unlimited email account connections with sender rotation · Automated multi-step cold email sequences with AI assistance · Unified inbox to manage prospect replies across all connected accounts · Integrated deliverability suite with email warm-up and sequence scoring · Built-in B2B Lead Finder contact database with verification credits | None | $41/mo |
| Apollo.io | Database of over 275 million B2B contacts with verified email addresses · Automated multi-step email sequences and engagement cadences · Chrome extension for lead enrichment and prospecting directly from LinkedIn · Native CRM integrations with platforms like Salesforce and HubSpot | Free plan includes up to 10,000 email credits per month, limited mobile and export credits, basic filters, and 2 active | $49/mo |
| AhaSend | Fast transactional API · Simple pricing · Engineer support | Limited free allowance | $50/mo |
| Reply.io | Multichannel sequences across email, LinkedIn, calls, SMS, and WhatsApp · Unlimited connected mailboxes with automated email warmup · Autonomous AI SDR agent (Jason AI) for prospecting and meeting booking · Comprehensive REST API and MCP server support for agentic sales automation | None (14-day free trial available) | $59/mo |
| AgentMail | AI agent inboxes · Programmatic email · Message processing | Developer access varies | $60/mo |
| Robotomail | Multi-tenant inboxes · Event streaming · Conversation threads | Developer access varies | $60/mo |
| Resend | React Email · Simple API · Webhooks | 3,000 emails/mo | $65/mo |
| SendGrid | Marketing + transactional · Mature deliverability | 100 emails/day (trial) | $70/mo |
| SparkPost | Deliverability analytics · Enterprise scale · Predictive signals | Trial availability varies | $70/mo |
| SMTP.com | SMTP relay · Sender reputation · Bulk transactional email | Trial | $75/mo |
| MailerSend | REST API · Template builder · Inbound routing | Limited free plan | $78/mo |
| Maileroo | Transactional API · Inbound webhooks · Simple REST setup | Limited free plan | $82/mo |
| MailerLite | Email marketing · Automation · Budget friendly | Limited free plan | $96/mo |
| Plunk | Open source · Simple API · AWS SES infrastructure | Developer free allowance | $97/mo |
| Loops | SaaS lifecycle email · Event tracking · Modern UI | Trial | $99/mo |
| QuickMail | Deliverability safeguards · Multichannel campaigns · Team inbox | Trial | $99/mo |
| Mailgun | Email validation · Inbound routing · EU region | 100 emails/day | $100/mo |
| SuprSend | Multi-channel support including Email, SMS, Push, In-App Inbox, WhatsApp, Slack, and MS Teams · Visual workflow engine for branching, routing, batching, and digest scheduling · Centralized template management with WYSIWYG editor, version control, and multi-lingual (i18n) localization · Pre-built in-app feed SDKs and customizable preference center | Free plan includes up to 10,000 notifications per month across unlimited channels with community support. | $100/mo |
| Brevo | Transactional + marketing · SMS · EU-based | Limited free plan | $105/mo |
| Mailtrap | Email sandbox · Sending API · Detailed logs | Limited free plan | $105/mo |
| Klaviyo | E-commerce data · Omnichannel · Shopify ecosystem | Limited free plan | $115/mo |
| Kit | Creator newsletters · Sequences · Subscriber API | Creator free plan | $119/mo |
| Smartlead | Multiple sending accounts · Lead routing · Master inbox | Trial | $119/mo |
| Instantly | Account rotation · Warmup · Inbox placement | Trial | $127/mo |
| Postmark | Delivery speed · Message streams · 45-day retention | 100 emails/mo | $134/mo |
| Knock | Cross-channel workflow orchestration with batching, delays, and branch logic · Prebuilt and headless UI components for in-app notification feeds · Out-of-the-box user preference management and hosted preference centers · Git-like commit and workflow promotion across environments with CLI and API support | Developer plan includes up to 10,000 messages per month, 500 guide active users, and 500 AI agent credits. | $250/mo |
| Customer.io | Behavioral messaging · Lifecycle workflows · Event triggers | Trial | $280/mo |
| Lemlist | Personalization · Multichannel outreach · Campaign API | Trial | $295/mo |
- Features
- Exclusively transactional email sending to protect domain and IP reputation · Credit-based pay-as-you-go pricing with no monthly subscription lock-in (credits valid for 6 months) · Integration via RESTful APIs and SMTP relay with SDK support for multiple languages · Comprehensive email logs, suppression list management, and delivery analytics
- Free tier
- 10,000 free email credits on account signup, valid for 6 months
- Est. monthly
- $0/mo
- Features
- Multi-channel routing across email, SMS, push, in-app inbox, Slack, Teams, and WhatsApp via a single API · Drop-in notification center and toasts for web and mobile applications · Visual template builder and journey workflows with automatic provider failover across 50+ integrations · Developer and AI tooling including official MCP server, CLI, and client/server SDKs · Pay-as-you-go pricing at $0.005 per send on all channels with no per-seat fees
- Free tier
- Developer plan includes 10,000 free sends per month with journeys, broadcasts, SDKs, CLI, and MCP server support.
- Est. monthly
- $0/mo
- Features
- SMTP relay and REST APIs for marketing and transactional emails · Dedicated IP addresses with automated IP warm-up schedules · Per-ISP send-rate controls and integrated Feedback Loops (FBLs) · Drag-and-drop campaign email builder and HTML editor · Real-time event webhooks and delivery monitoring
- Free tier
- 1,000 free emails per month
- Est. monthly
- $0/mo
- Features
- Email delivery via RESTful Web API and SMTP API · Dynamic templating supporting Liquid, Velocity, and Simple template engines · Drag-and-drop email builder with AI HTML editor and 200+ pre-built templates · Real-time event webhooks, click/open tracking, and up to 100 days of analytics storage · Integrated email validation API and automatic suppression list management
- Free tier
- 4-month free trial with 6,000 emails/month and 100 email validations; free testing tier allows up to 100 emails/day to v
- Est. monthly
- $4.00/mo
- Features
- Custom-domain email with webmail, IMAP, SMTP, and JMAP support · REST API, webhooks, and MCP server for AI agent integration · Shared inboxes, calendars, contact management, and booking features · 15–25 GB of storage per mailbox
- Free tier
- None (14-day free trial, credit card required)
- Est. monthly
- $4.00/mo
- Features
- Unified REST API and SDKs (TypeScript and Python) for outbound and inbound email · Per-agent dedicated inboxes and official MCP server integration for AI agents · Automated domain authentication setup and verification for SPF, DKIM, and DMARC · Signed webhooks across email lifecycle and delivery events
- Free tier
- Free tier includes 6,000 monthly emails (capped at 200 daily outbound sends), 3 inboxes per domain, 0.5 GB retained stor
- Est. monthly
- $5.00/mo
- Features
- Programmatic inbox provisioning via REST API, SDKs, and native Model Context Protocol (MCP) server support · Inbound prompt-injection risk scoring and structured JSON reply parsing · Real-time event streaming and delivery via HMAC-signed webhooks, WebSockets, and SSE · Custom domain support with automatic SPF, DKIM, and DMARC configuration
- Free tier
- 5 inboxes and 5,000 emails per month with no credit card required.
- Est. monthly
- $5.00/mo
- Features
- Supports SMTP relay and REST API integration · Generous free tier offering 12,000 emails per month · SPF, DKIM, and DMARC domain authentication support · Delivery statistics, unsubscribe management, and webhook notifications · Dedicated IP addresses available on higher-tier plans
- Free tier
- 12,000 emails/month (rate-limited to 50 emails/hour, up to 2 sending domains)
- Est. monthly
- $8.85/mo
- Features
- Send transactional and marketing emails via Send API v3.1 or SMTP relay · Real-time event webhooks for opens, clicks, bounces, spam complaints, and blocks · Responsive email builder with support for MJML open-source markup · Contact list management, email address validations, and inbox preview testing
- Free tier
- Free plan includes 6,000 emails per month capped at 200 emails per day, with up to 1,000 contacts, API/SMTP relay access
- Est. monthly
- $9.00/mo
- Features
- Unlimited email campaigns and sends on paid plans · Visual drag-and-drop email automation workflow builder · Built-in landing page and subscription form builders · Real-time analytics and reporting tools
- Free tier
- None
- Est. monthly
- $9.00/mo
- Features
- Drag-and-drop email builder with custom HTML template import · Visual customer journey automation and drip campaigns · Built-in transactional email sending with REST API integration · A/B testing, inbox preview, and spam testing tools · Send time optimization and engagement-based segmentation on higher tiers
- Free tier
- 30-day free trial for up to 500 contacts and 500 email sends
- Est. monthly
- $13/mo
- Features
- High-deliverability SMTP relay and developer REST APIs · Real-time analytics for opens, clicks, unsubscribes, and bounces · 24/7 customer support via ticket, live chat, and phone · Integrated email validation and custom tracking domain configuration
- Free tier
- 6,000 emails per month (capped at 200 emails per day) with no credit card required
- Est. monthly
- $15/mo
- Features
- SMTP relay and RESTful API integration with global data centers · Real-time analytics and tracking for delivery, opens, clicks, bounces, and spam complaints · Email overage support allowing sending up to 3x plan limits on paid tiers · Subaccount management and unlimited team members on all paid plans · Dedicated IP included on Professional plans starting at 100,000 emails/month
- Free tier
- 1,000 emails/month (capped at 200 emails/day), 5 days of reporting, ticket support, and no credit card required.
- Est. monthly
- $15/mo
- Features
- Usage based · AWS integration · Dedicated IP options
- Free tier
- AWS Free Tier credits may apply
- Est. monthly
- $16/mo
- Features
- Ecommerce-tailored automations for cart abandonment, order confirmations, and win-back flows · Multi-channel support including email, SMS, and web push notifications · Extensive REST API for managing contacts, custom events, orders, and campaigns · Dynamic product recommendation and discount code content blocks
- Free tier
- Free for up to 250 contacts and 500 emails/month with access to core automations, templates, and signup forms.
- Est. monthly
- $16/mo
- Features
- REST API and SMTP relay for transactional and marketing email delivery · SDKs and client libraries for 12 programming languages · Drag-and-drop template designer and built-in email verification · Real-time deliverability analytics, webhooks, and suppression management
- Free tier
- Free tier includes up to 3,000 emails per month with a daily send limit of 100 emails.
- Est. monthly
- $19/mo
- Features
- Unlimited email sends across all standard paid tiers · Visual marketing automation workflows and autoresponders · Drag-and-drop landing page and website builders with AI features · Built-in webinar hosting and conversion funnel tools · Comprehensive REST API, webhooks, and ecommerce integrations
- Free tier
- Free plan includes up to 500 contacts, 2,500 emails per month, and access to basic marketing tools.
- Est. monthly
- $19/mo
- Features
- Send transactional emails via REST API or SMTP credentials · Sold in blocks of 25,000 emails with volume discounts from $20 down to $10 per block · Inbound email processing and real-time event webhooks · Custom domain whitelabeling, dedicated IPs, and rules engine
- Free tier
- Up to 500 free demo/test email sends to a verified domain for new users.
- Est. monthly
- $20/mo
- Features
- Inbound email parsing delivered as structured JSON with automatic prompt-injection detection · Automatic email thread reconstruction and conversation handling via REST, SSE, or webhooks · Native Model Context Protocol (MCP) server support alongside TypeScript and Python SDKs · Per-agent reputation monitoring and send limits with cold outreach enforcement
- Free tier
- 3,000 events/month, 1 agent, sending via workspace subdomain, MCP server access, and SDKs with no credit card required
- Est. monthly
- $20/mo
- Features
- Native support for AI agents via Model Context Protocol (MCP), REST API, and CLI · Unified sending for newsletters, transactional emails, and automated lifecycle flows · Unlimited contacts included on all plans with pricing based solely on send volume · Automated brand kit formatting and AI copywriting powered by NitroWheel LLM · Support for bringing your own sending infrastructure (e.g., SES, Mailgun) and AI API keys
- Free tier
- 8,000 starter emails up front, then 500 emails/month with unlimited contacts, 1 seat, and full MCP/API/CLI access
- Est. monthly
- $20/mo
- Features
- Block-based visual template builder supporting Liquid syntax, conditional logic, loops, and test data · Detailed observability with complete message logs including rendered HTML, variables, and delivery event timeline · Unlimited team members with no per-seat fees on all plans · Purposely designed for transactional emails with curated IP pools to maintain high deliverability
- Free tier
- None (sandbox/free trial only; no ongoing free tier for live sending)
- Est. monthly
- $20/mo
- Features
- Automated cold email sequencing with personalized follow-ups · Unlimited email warmup and automated email verification · AI email writing assistant and campaign A/B testing · CRM integrations with Salesforce, HubSpot, and Pipedrive
- Free tier
- None
- Est. monthly
- $29/mo
- Features
- European cloud · Data residency · Transactional API
- Free tier
- Usage-based
- Est. monthly
- $30/mo
- Features
- Unified multi-channel orchestration across email, in-app inbox, SMS, push, and chat · Pre-built embeddable Inbox component and subscriber preference management · Workflow engine supporting digests, delays, conditional logic, and provider integrations · Open-source core with options for cloud hosting or self-hosted deployment
- Free tier
- Free tier includes 10,000 workflow runs per month across all channels, up to 20 workflows, 2 environments, and up to 3 t
- Est. monthly
- $30/mo
- Features
- Unlimited email accounts and unlimited team members included on all tiers · Built-in deliverability features including automated warm-up, inbox rotation, and adaptive human-like sending · Real-time email list verification and catch-all validation included at no extra cost · Condition-based sequences with automated follow-ups and LinkedIn outreach steps · Developer ecosystem including REST API, webhooks, Model Context Protocol (MCP) server, and CLI
- Free tier
- None (offers a 14-day free trial with up to 100 cold emails)
- Est. monthly
- $35/mo
- Features
- Cloud SMTP relay service and REST email injection API · StreamScore deliverability scoring and reporting analytics · Inbound email stream parsing and real-time webhook event notifications · Configurable overage protection and automated IP warmup
- Free tier
- None (offers a 1-month free trial with 40,000 emails, no credit card required)
- Est. monthly
- $40/mo
- Features
- Unlimited email account connections with sender rotation · Automated multi-step cold email sequences with AI assistance · Unified inbox to manage prospect replies across all connected accounts · Integrated deliverability suite with email warm-up and sequence scoring · Built-in B2B Lead Finder contact database with verification credits
- Free tier
- None
- Est. monthly
- $41/mo
- Features
- Database of over 275 million B2B contacts with verified email addresses · Automated multi-step email sequences and engagement cadences · Chrome extension for lead enrichment and prospecting directly from LinkedIn · Native CRM integrations with platforms like Salesforce and HubSpot
- Free tier
- Free plan includes up to 10,000 email credits per month, limited mobile and export credits, basic filters, and 2 active
- Est. monthly
- $49/mo
- Features
- Fast transactional API · Simple pricing · Engineer support
- Free tier
- Limited free allowance
- Est. monthly
- $50/mo
- Features
- Multichannel sequences across email, LinkedIn, calls, SMS, and WhatsApp · Unlimited connected mailboxes with automated email warmup · Autonomous AI SDR agent (Jason AI) for prospecting and meeting booking · Comprehensive REST API and MCP server support for agentic sales automation
- Free tier
- None (14-day free trial available)
- Est. monthly
- $59/mo
- Features
- AI agent inboxes · Programmatic email · Message processing
- Free tier
- Developer access varies
- Est. monthly
- $60/mo
- Features
- Multi-tenant inboxes · Event streaming · Conversation threads
- Free tier
- Developer access varies
- Est. monthly
- $60/mo
- Features
- React Email · Simple API · Webhooks
- Free tier
- 3,000 emails/mo
- Est. monthly
- $65/mo
- Features
- Marketing + transactional · Mature deliverability
- Free tier
- 100 emails/day (trial)
- Est. monthly
- $70/mo
- Features
- Deliverability analytics · Enterprise scale · Predictive signals
- Free tier
- Trial availability varies
- Est. monthly
- $70/mo
- Features
- SMTP relay · Sender reputation · Bulk transactional email
- Free tier
- Trial
- Est. monthly
- $75/mo
- Features
- REST API · Template builder · Inbound routing
- Free tier
- Limited free plan
- Est. monthly
- $78/mo
- Features
- Transactional API · Inbound webhooks · Simple REST setup
- Free tier
- Limited free plan
- Est. monthly
- $82/mo
- Features
- Email marketing · Automation · Budget friendly
- Free tier
- Limited free plan
- Est. monthly
- $96/mo
- Features
- Open source · Simple API · AWS SES infrastructure
- Free tier
- Developer free allowance
- Est. monthly
- $97/mo
- Features
- SaaS lifecycle email · Event tracking · Modern UI
- Free tier
- Trial
- Est. monthly
- $99/mo
- Features
- Deliverability safeguards · Multichannel campaigns · Team inbox
- Free tier
- Trial
- Est. monthly
- $99/mo
- Features
- Email validation · Inbound routing · EU region
- Free tier
- 100 emails/day
- Est. monthly
- $100/mo
- Features
- Multi-channel support including Email, SMS, Push, In-App Inbox, WhatsApp, Slack, and MS Teams · Visual workflow engine for branching, routing, batching, and digest scheduling · Centralized template management with WYSIWYG editor, version control, and multi-lingual (i18n) localization · Pre-built in-app feed SDKs and customizable preference center
- Free tier
- Free plan includes up to 10,000 notifications per month across unlimited channels with community support.
- Est. monthly
- $100/mo
- Features
- Transactional + marketing · SMS · EU-based
- Free tier
- Limited free plan
- Est. monthly
- $105/mo
- Features
- Email sandbox · Sending API · Detailed logs
- Free tier
- Limited free plan
- Est. monthly
- $105/mo
- Features
- E-commerce data · Omnichannel · Shopify ecosystem
- Free tier
- Limited free plan
- Est. monthly
- $115/mo
- Features
- Creator newsletters · Sequences · Subscriber API
- Free tier
- Creator free plan
- Est. monthly
- $119/mo
- Features
- Multiple sending accounts · Lead routing · Master inbox
- Free tier
- Trial
- Est. monthly
- $119/mo
- Features
- Account rotation · Warmup · Inbox placement
- Free tier
- Trial
- Est. monthly
- $127/mo
- Features
- Delivery speed · Message streams · 45-day retention
- Free tier
- 100 emails/mo
- Est. monthly
- $134/mo
- Features
- Cross-channel workflow orchestration with batching, delays, and branch logic · Prebuilt and headless UI components for in-app notification feeds · Out-of-the-box user preference management and hosted preference centers · Git-like commit and workflow promotion across environments with CLI and API support
- Free tier
- Developer plan includes up to 10,000 messages per month, 500 guide active users, and 500 AI agent credits.
- Est. monthly
- $250/mo
- Features
- Behavioral messaging · Lifecycle workflows · Event triggers
- Free tier
- Trial
- Est. monthly
- $280/mo
- Features
- Personalization · Multichannel outreach · Campaign API
- Free tier
- Trial
- Est. monthly
- $295/mo
6 of 54
Auth & Backend · at 25,000 MAUs
| Firebase Auth | Google ecosystem · Phone auth | 50,000 MAUs | $0/mo |
| WorkOS | SSO + SCIM · Admin portal · Enterprise-ready | 1M MAUs free (AuthKit) | $0/mo |
| Better Auth | TypeScript-first · Plugins · Self-hosted | Free, open source | $0/mo |
| PocketBase | Single binary · SQLite · Realtime | Free, self-hosted | $0/mo |
| Lucia | Library, not a service · Session-based · Full control | Free, open source | $0/mo |
| Transmit Security | Passwordless · Fraud & risk · Enterprise CIAM | Custom trial | $0/mo |
| Appwrite Cloud | Open-source BaaS · Databases + storage · Functions | 75K MAUs | $25/mo |
| Clerk | Prebuilt UI · Organizations | 10,000 MAUs | $325/mo |
| Passage by 1Password | Passkeys-first · Biometrics · 1Password backed | 500 MAUs | $499/mo |
| Amazon Cognito | AWS native · Pay per MAU · User pools | 10K MAUs | $600/mo |
| Auth0 | Enterprise SSO · Actions | 25,000 MAUs | $1,750/mo |
| Descope | No-code flows · Passwordless · B2B SSO | 7.5K MAUs | $2,249/mo |
| Stytch | Passkeys · B2B orgs · Fraud prevention | 10K MAUs | $4,000/mo |
| Okta Customer Identity | Enterprise CIAM · Compliance · Workforce + customer | 25K MAUs (Auth0) | $100,000/mo |
| Ping Identity | Enterprise federation · Orchestration · Regulated industries | Trial | $150,000/mo |
- Features
- Google ecosystem · Phone auth
- Free tier
- 50,000 MAUs
- Est. monthly
- $0/mo
- Features
- SSO + SCIM · Admin portal · Enterprise-ready
- Free tier
- 1M MAUs free (AuthKit)
- Est. monthly
- $0/mo
- Features
- TypeScript-first · Plugins · Self-hosted
- Free tier
- Free, open source
- Est. monthly
- $0/mo
- Features
- Single binary · SQLite · Realtime
- Free tier
- Free, self-hosted
- Est. monthly
- $0/mo
- Features
- Library, not a service · Session-based · Full control
- Free tier
- Free, open source
- Est. monthly
- $0/mo
- Features
- Passwordless · Fraud & risk · Enterprise CIAM
- Free tier
- Custom trial
- Est. monthly
- $0/mo
- Features
- Open-source BaaS · Databases + storage · Functions
- Free tier
- 75K MAUs
- Est. monthly
- $25/mo
- Features
- Prebuilt UI · Organizations
- Free tier
- 10,000 MAUs
- Est. monthly
- $325/mo
- Features
- Passkeys-first · Biometrics · 1Password backed
- Free tier
- 500 MAUs
- Est. monthly
- $499/mo
- Features
- AWS native · Pay per MAU · User pools
- Free tier
- 10K MAUs
- Est. monthly
- $600/mo
- Features
- Enterprise SSO · Actions
- Free tier
- 25,000 MAUs
- Est. monthly
- $1,750/mo
- Features
- No-code flows · Passwordless · B2B SSO
- Free tier
- 7.5K MAUs
- Est. monthly
- $2,249/mo
- Features
- Passkeys · B2B orgs · Fraud prevention
- Free tier
- 10K MAUs
- Est. monthly
- $4,000/mo
- Features
- Enterprise CIAM · Compliance · Workforce + customer
- Free tier
- 25K MAUs (Auth0)
- Est. monthly
- $100,000/mo
- Features
- Enterprise federation · Orchestration · Regulated industries
- Free tier
- Trial
- Est. monthly
- $150,000/mo
6 of 15
Compute & Storage · at 20 million requests
| AWS Lambda | Pay per request · Any runtime · AWS integration | 1M requests/mo | $3.80/mo |
| Cloudflare Workers | Zero egress · R2 storage | 100k req/day | $5.00/mo |
| Backblaze B2 | Low-cost storage · S3-compatible · Free egress via CDN partners | 10 GB | $5.94/mo |
| Wasabi | Flat pricing · No egress fees · 1 TB minimum | 30-day trial | $6.99/mo |
| Cloudflare R2 | Zero egress fees · S3-compatible · Workers binding | 10 GB/mo | $15/mo |
| Fly.io | Global VMs · Postgres | Pay as you go | $30/mo |
| Netlify Pro | Jamstack hosting · Edge functions · Forms | Starter plan | $40/mo |
| Render | Git deploys · Managed Postgres · Background workers | Free web services | $40/mo |
| Railway | Usage-based · Instant deploys · Templates | Trial credits | $40/mo |
| Vercel Pro | Edge network · Preview deploys | Hobby: 100 GB | $95/mo |
| AWS ECS (Fargate) | Managed containers · Fargate serverless · AWS native | None | $118/mo |
| AWS S3 | Industry standard · Lifecycle rules | 5 GB storage (12 mo) | $126/mo |
| RunPod | On-demand GPUs · Serverless endpoints · Community cloud | None | $398/mo |
| Modal | Python-native · Scale to zero · Fast cold starts | $30/mo credits | $941/mo |
| Replicate | Model marketplace · Pay per second · One-line deploys | Trial | $1,098/mo |
| CoreWeave | H100 clusters · Kubernetes-native · Enterprise AI | Custom | $1,232/mo |
- Features
- Pay per request · Any runtime · AWS integration
- Free tier
- 1M requests/mo
- Est. monthly
- $3.80/mo
- Features
- Zero egress · R2 storage
- Free tier
- 100k req/day
- Est. monthly
- $5.00/mo
- Features
- Low-cost storage · S3-compatible · Free egress via CDN partners
- Free tier
- 10 GB
- Est. monthly
- $5.94/mo
- Features
- Flat pricing · No egress fees · 1 TB minimum
- Free tier
- 30-day trial
- Est. monthly
- $6.99/mo
- Features
- Zero egress fees · S3-compatible · Workers binding
- Free tier
- 10 GB/mo
- Est. monthly
- $15/mo
- Features
- Global VMs · Postgres
- Free tier
- Pay as you go
- Est. monthly
- $30/mo
- Features
- Jamstack hosting · Edge functions · Forms
- Free tier
- Starter plan
- Est. monthly
- $40/mo
- Features
- Git deploys · Managed Postgres · Background workers
- Free tier
- Free web services
- Est. monthly
- $40/mo
- Features
- Usage-based · Instant deploys · Templates
- Free tier
- Trial credits
- Est. monthly
- $40/mo
- Features
- Edge network · Preview deploys
- Free tier
- Hobby: 100 GB
- Est. monthly
- $95/mo
- Features
- Managed containers · Fargate serverless · AWS native
- Free tier
- None
- Est. monthly
- $118/mo
- Features
- Industry standard · Lifecycle rules
- Free tier
- 5 GB storage (12 mo)
- Est. monthly
- $126/mo
- Features
- On-demand GPUs · Serverless endpoints · Community cloud
- Free tier
- None
- Est. monthly
- $398/mo
- Features
- Python-native · Scale to zero · Fast cold starts
- Free tier
- $30/mo credits
- Est. monthly
- $941/mo
- Features
- Model marketplace · Pay per second · One-line deploys
- Free tier
- Trial
- Est. monthly
- $1,098/mo
- Features
- H100 clusters · Kubernetes-native · Enterprise AI
- Free tier
- Custom
- Est. monthly
- $1,232/mo
6 of 16
CRMs & Customer Data · at 50,000 monthly tracked users
| Amplitude | Behavioral analytics · Experimentation · CDP | 50K MTUs | $49/mo |
| HubSpot CRM | Marketing hub · Huge ecosystem | Free CRM | $100/mo |
| Pipedrive | Pipeline-first UI · Automations | 14-day trial | $120/mo |
| Attio | Data-model flexibility · API-first | 3 seats free | $145/mo |
| PostHog | Product analytics · Session replay · Feature flags | 1M events/mo | $200/mo |
| Census | Reverse ETL · Warehouse-native · Audience hub | Free plan | $550/mo |
| Twilio Segment | Event tracking · 300+ integrations · Profiles | 1K MTUs | $600/mo |
| RudderStack | Open-source CDP · Warehouse-first · Event streaming | 1M events/mo | $800/mo |
| Salesforce Platform | Enterprise CRM · Apex + APIs · AppExchange | 30-day trial | $875/mo |
| Hightouch | Reverse ETL · Composable CDP · AI decisioning | Free plan | $875/mo |
| Mixpanel | Event analytics · Funnels · Cohorts | 1M events/mo | $1,120/mo |
- Features
- Behavioral analytics · Experimentation · CDP
- Free tier
- 50K MTUs
- Est. monthly
- $49/mo
- Features
- Marketing hub · Huge ecosystem
- Free tier
- Free CRM
- Est. monthly
- $100/mo
- Features
- Pipeline-first UI · Automations
- Free tier
- 14-day trial
- Est. monthly
- $120/mo
- Features
- Data-model flexibility · API-first
- Free tier
- 3 seats free
- Est. monthly
- $145/mo
- Features
- Product analytics · Session replay · Feature flags
- Free tier
- 1M events/mo
- Est. monthly
- $200/mo
- Features
- Reverse ETL · Warehouse-native · Audience hub
- Free tier
- Free plan
- Est. monthly
- $550/mo
- Features
- Event tracking · 300+ integrations · Profiles
- Free tier
- 1K MTUs
- Est. monthly
- $600/mo
- Features
- Open-source CDP · Warehouse-first · Event streaming
- Free tier
- 1M events/mo
- Est. monthly
- $800/mo
- Features
- Enterprise CRM · Apex + APIs · AppExchange
- Free tier
- 30-day trial
- Est. monthly
- $875/mo
- Features
- Reverse ETL · Composable CDP · AI decisioning
- Free tier
- Free plan
- Est. monthly
- $875/mo
- Features
- Event analytics · Funnels · Cohorts
- Free tier
- 1M events/mo
- Est. monthly
- $1,120/mo
6 of 11
