Email APIs · side by side
Brevo vs Customer.io
Compare Brevo, Customer.io by sending volume, delivery webhooks, inbound email, domain limits and retention.
Email APIs pricing calculator
These providers bill in different units. Each estimate uses its own workload; there is no same-volume price winner.
Brevo
100K
Customer.io
25K
Brevo
$105 / mo
Standard · 100K emails
Customer.io
Custom / not listed
Custom / unlisted usage pricing · 25K profiles
Listed USD plan fees and tracked usage only. Unlisted compute, transfer, extras, taxes and contract terms are excluded. Custom or unsupported plan usage is not estimated.
Email APIs overview & pricing
| Email APIs | Brevo | Customer.io |
|---|---|---|
| Provider | Brevo | Customer.io |
| Billing unit | emails | profiles |
| Plan at selected usage | Standard | Custom / unlisted usage pricing |
| Monthly estimate | $105/mo | Custom / not listed |
| Workload | 100K emails | 25K profiles |
| Free access | Limited free plan | Trial |
| Published plans | Free, Standard, Starter, Professional, Enterprise | Essentials, Premium, Enterprise |
| Prices checked | 2026-10-08 | 2026-10-08 |
Provider
- Brevo
- Brevo
- Customer.io
- Customer.io
Billing unit
- Brevo
- emails
- Customer.io
- profiles
Plan at selected usage
- Brevo
- Standard
- Customer.io
- Custom / unlisted usage pricing
Monthly estimate
- Brevo
- $105/mo
- Customer.io
- Custom / not listed
Workload
- Brevo
- 100K emails
- Customer.io
- 25K profiles
Free access
- Brevo
- Limited free plan
- Customer.io
- Trial
Published plans
- Brevo
- Free, Standard, Starter, Professional, Enterprise
- Customer.io
- Essentials, Premium, Enterprise
Prices checked
- Brevo
- 2026-10-08
- Customer.io
- 2026-10-08
Email APIs monthly cost
Brevo: $105Customer.io: Not priced
Different workloads, separate estimates
Separate transactional delivery from campaigns, outreach and agent inboxes. Compare monthly sends and daily caps; contacts, seats and inboxes are not sending allowances. Budget separately for dedicated IPs, validation and attachments.
Email APIs feature comparison
| Email APIs | Brevo | Customer.io |
|---|---|---|
| Sending methods | Not listed | Not listed |
| Inbound processing | Not listed | Not listed |
| Sending domains | Not listed | Not listed |
| Activity retention | Not listed | Not listed |
| Webhooks & events | Not listed | Not listed |
| Dedicated IP | Not listed | Not listed |
| Single sign-on | Not listed | Not listed |
| Support | Not listed | Not listed |
| AI Agent (beta): Session limits | Not listed | Not listed |
| AI Agent (beta): Persistent Memory | Not listed | Not listed |
| AI Agent (beta): Core Execution Skills | Not listed | Not listed |
| AI Agent (beta): Custom Execution Skills | Not listed | Not listed |
| AI Agent (beta): Routines: # of tasks | Not listed | Not listed |
| AI Agent (beta): Routines: frequency | Not listed | Not listed |
| Monthly email sends | Not listed | Not listed |
| Transactional emails | Not listed | Not listed |
| Monthly push and in-app | Not listed | Not listed |
| Mobile SDKs | Not listed | Not listed |
| Monthly SMS sends | Not listed | Not listed |
| WhatsApp (Native) | Not listed | Not listed |
| LINE | Not listed | Not listed |
| Webhook (send & receive) | Not listed | Not listed |
| Anonymous messages | Not listed | Not listed |
| LLM actions | Not listed | Not listed |
| Visual workflow builder | Not listed | Not listed |
| Cross-channel campaign automation | Not listed | Not listed |
| Send-time optimization | Not listed | Not listed |
| In-app message suggestions | Not listed | Not listed |
| API-triggered broadcasts | Not listed | Not listed |
| Scalable Personalization | Not listed | Not listed |
| Custom SMTP | Not listed | Not listed |
| Profiles (people + objects) | Not listed | Not listed |
| People attributes | Not listed | Not listed |
| Custom objects | Not listed | Not listed |
| Object types | Not listed | Not listed |
| Segments | Not listed | Not listed |
| AI-powered segment builder | Not listed | Not listed |
| Suggested segments | Not listed | Not listed |
| Nested data | Not listed | Not listed |
| Ad audience sync | Not listed | Not listed |
| Custom collections | Not listed | Not listed |
| Drag-and-drop visual editor | Not listed | Not listed |
| Code editor | Not listed | Not listed |
| AI-generated global styles | Not listed | Not listed |
| AI translator for messages | Not listed | Not listed |
| Email content analysis | Not listed | Not listed |
| Reusable components | Not listed | Not listed |
| Saved templates & version control | Not listed | Not listed |
| Inbox previews | Not listed | Not listed |
| Monthly API calls | Not listed | Not listed |
| Integrations | Not listed | Not listed |
| MCP server | Not listed | Not listed |
| Data index | Not listed | Not listed |
| Connected forms | Not listed | Not listed |
| Privacy management | Not listed | Not listed |
| Reverse ETL | Not listed | Not listed |
| Data warehouse destinations | Not listed | Not listed |
| Data replay | Not listed | Not listed |
| Dashboards | Not listed | Not listed |
| Campaign reporting | Not listed | Not listed |
| Workspace performance dashboard | Not listed | Not listed |
| Survey analysis | Not listed | Not listed |
| Data export | Not listed | Not listed |
| A/B & multivariate testing | Not listed | Not listed |
| Conversion tracking | Not listed | Not listed |
| Universal search | Not listed | Not listed |
| SSO & 2-factor authentication | Not listed | Not listed |
| US / EU data centers | Not listed | Not listed |
| SOC Tier II Compliance | Not listed | Not listed |
| Standard role-based permissions | Not listed | Not listed |
| Custom role-based permissions | Not listed | Not listed |
| Managed deliverability | Not listed | Not listed |
| HIPAA Compliance | Not listed | Not listed |
| Audit logging & data governance | Not listed | Not listed |
| Dedicated hardware | Not listed | Not listed |
| Documentation | Not listed | Not listed |
| Community support | Not listed | Not listed |
| Email support | Not listed | Not listed |
| Chat support | Not listed | Not listed |
| Onboarding support | Not listed | Not listed |
| Dedicated Customer Success Manager | Not listed | Not listed |
| Migration support | Not listed | Not listed |
| Dedicated Technical Implementation Specialist | Not listed | Not listed |
| Shared Slack channel | Not listed | Not listed |
| 2-hour first outreach response time | Not listed | Not listed |
| User seats | Not listed | Not listed |
| Workspaces | Not listed | Not listed |
| Additional people & object profiles | Not listed | Not listed |
Sending methods
- Brevo
- Not listed
- Customer.io
- Not listed
Inbound processing
- Brevo
- Not listed
- Customer.io
- Not listed
Sending domains
- Brevo
- Not listed
- Customer.io
- Not listed
Activity retention
- Brevo
- Not listed
- Customer.io
- Not listed
Webhooks & events
- Brevo
- Not listed
- Customer.io
- Not listed
Dedicated IP
- Brevo
- Not listed
- Customer.io
- Not listed
Single sign-on
- Brevo
- Not listed
- Customer.io
- Not listed
Support
- Brevo
- Not listed
- Customer.io
- Not listed
AI Agent (beta): Session limits
- Brevo
- Not listed
- Customer.io
- Not listed
AI Agent (beta): Persistent Memory
- Brevo
- Not listed
- Customer.io
- Not listed
AI Agent (beta): Core Execution Skills
- Brevo
- Not listed
- Customer.io
- Not listed
AI Agent (beta): Custom Execution Skills
- Brevo
- Not listed
- Customer.io
- Not listed
AI Agent (beta): Routines: # of tasks
- Brevo
- Not listed
- Customer.io
- Not listed
AI Agent (beta): Routines: frequency
- Brevo
- Not listed
- Customer.io
- Not listed
Monthly email sends
- Brevo
- Not listed
- Customer.io
- Not listed
Transactional emails
- Brevo
- Not listed
- Customer.io
- Not listed
Monthly push and in-app
- Brevo
- Not listed
- Customer.io
- Not listed
Mobile SDKs
- Brevo
- Not listed
- Customer.io
- Not listed
Monthly SMS sends
- Brevo
- Not listed
- Customer.io
- Not listed
WhatsApp (Native)
- Brevo
- Not listed
- Customer.io
- Not listed
LINE
- Brevo
- Not listed
- Customer.io
- Not listed
Webhook (send & receive)
- Brevo
- Not listed
- Customer.io
- Not listed
Anonymous messages
- Brevo
- Not listed
- Customer.io
- Not listed
LLM actions
- Brevo
- Not listed
- Customer.io
- Not listed
Visual workflow builder
- Brevo
- Not listed
- Customer.io
- Not listed
Cross-channel campaign automation
- Brevo
- Not listed
- Customer.io
- Not listed
Send-time optimization
- Brevo
- Not listed
- Customer.io
- Not listed
In-app message suggestions
- Brevo
- Not listed
- Customer.io
- Not listed
API-triggered broadcasts
- Brevo
- Not listed
- Customer.io
- Not listed
Scalable Personalization
- Brevo
- Not listed
- Customer.io
- Not listed
Custom SMTP
- Brevo
- Not listed
- Customer.io
- Not listed
Profiles (people + objects)
- Brevo
- Not listed
- Customer.io
- Not listed
People attributes
- Brevo
- Not listed
- Customer.io
- Not listed
Custom objects
- Brevo
- Not listed
- Customer.io
- Not listed
Object types
- Brevo
- Not listed
- Customer.io
- Not listed
Segments
- Brevo
- Not listed
- Customer.io
- Not listed
AI-powered segment builder
- Brevo
- Not listed
- Customer.io
- Not listed
Suggested segments
- Brevo
- Not listed
- Customer.io
- Not listed
Nested data
- Brevo
- Not listed
- Customer.io
- Not listed
Ad audience sync
- Brevo
- Not listed
- Customer.io
- Not listed
Custom collections
- Brevo
- Not listed
- Customer.io
- Not listed
Drag-and-drop visual editor
- Brevo
- Not listed
- Customer.io
- Not listed
Code editor
- Brevo
- Not listed
- Customer.io
- Not listed
AI-generated global styles
- Brevo
- Not listed
- Customer.io
- Not listed
AI translator for messages
- Brevo
- Not listed
- Customer.io
- Not listed
Email content analysis
- Brevo
- Not listed
- Customer.io
- Not listed
Reusable components
- Brevo
- Not listed
- Customer.io
- Not listed
Saved templates & version control
- Brevo
- Not listed
- Customer.io
- Not listed
Inbox previews
- Brevo
- Not listed
- Customer.io
- Not listed
Monthly API calls
- Brevo
- Not listed
- Customer.io
- Not listed
Integrations
- Brevo
- Not listed
- Customer.io
- Not listed
MCP server
- Brevo
- Not listed
- Customer.io
- Not listed
Data index
- Brevo
- Not listed
- Customer.io
- Not listed
Connected forms
- Brevo
- Not listed
- Customer.io
- Not listed
Privacy management
- Brevo
- Not listed
- Customer.io
- Not listed
Reverse ETL
- Brevo
- Not listed
- Customer.io
- Not listed
Data warehouse destinations
- Brevo
- Not listed
- Customer.io
- Not listed
Data replay
- Brevo
- Not listed
- Customer.io
- Not listed
Dashboards
- Brevo
- Not listed
- Customer.io
- Not listed
Campaign reporting
- Brevo
- Not listed
- Customer.io
- Not listed
Workspace performance dashboard
- Brevo
- Not listed
- Customer.io
- Not listed
Survey analysis
- Brevo
- Not listed
- Customer.io
- Not listed
Data export
- Brevo
- Not listed
- Customer.io
- Not listed
A/B & multivariate testing
- Brevo
- Not listed
- Customer.io
- Not listed
Conversion tracking
- Brevo
- Not listed
- Customer.io
- Not listed
Universal search
- Brevo
- Not listed
- Customer.io
- Not listed
SSO & 2-factor authentication
- Brevo
- Not listed
- Customer.io
- Not listed
US / EU data centers
- Brevo
- Not listed
- Customer.io
- Not listed
SOC Tier II Compliance
- Brevo
- Not listed
- Customer.io
- Not listed
Standard role-based permissions
- Brevo
- Not listed
- Customer.io
- Not listed
Custom role-based permissions
- Brevo
- Not listed
- Customer.io
- Not listed
Managed deliverability
- Brevo
- Not listed
- Customer.io
- Not listed
HIPAA Compliance
- Brevo
- Not listed
- Customer.io
- Not listed
Audit logging & data governance
- Brevo
- Not listed
- Customer.io
- Not listed
Dedicated hardware
- Brevo
- Not listed
- Customer.io
- Not listed
Documentation
- Brevo
- Not listed
- Customer.io
- Not listed
Community support
- Brevo
- Not listed
- Customer.io
- Not listed
Email support
- Brevo
- Not listed
- Customer.io
- Not listed
Chat support
- Brevo
- Not listed
- Customer.io
- Not listed
Onboarding support
- Brevo
- Not listed
- Customer.io
- Not listed
Dedicated Customer Success Manager
- Brevo
- Not listed
- Customer.io
- Not listed
Migration support
- Brevo
- Not listed
- Customer.io
- Not listed
Dedicated Technical Implementation Specialist
- Brevo
- Not listed
- Customer.io
- Not listed
Shared Slack channel
- Brevo
- Not listed
- Customer.io
- Not listed
2-hour first outreach response time
- Brevo
- Not listed
- Customer.io
- Not listed
User seats
- Brevo
- Not listed
- Customer.io
- Not listed
Workspaces
- Brevo
- Not listed
- Customer.io
- Not listed
Additional people & object profiles
- Brevo
- Not listed
- Customer.io
- Not listed
Showing 15 of 88
Which email providers fit your needs?
Brevo features & plan notes
- Transactional + marketing
- SMS
- EU-based
- Everything in Starter
- Marketing automation (unlimited automated, multi-step workflows)
- A/B testing
- Advanced email reporting (click heatmaps, geography & device reports)
- AI send time optimization
- Web & event tracking
- Landing pages (1 page included)
- No Brevo logo (Remove the 'Sent with Brevo' footer)
- Sales Essentials (add-on)
Customer.io features & plan notes
- Behavioral messaging
- Lifecycle workflows
- Event triggers
How to compare email providers
Separate transactional delivery from campaigns, outreach and agent inboxes. Compare monthly sends and daily caps; contacts, seats and inboxes are not sending allowances. Budget separately for dedicated IPs, validation and attachments.
Browse Email APIs pricing