Email APIs · side by side
Courier vs Klaviyo
Compare Courier, Klaviyo 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.
Courier
Klaviyo
Courier
$0 / mo
Developer · 0 sends
Klaviyo
Custom / not listed
Custom / unlisted usage pricing · 10K 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 | Courier | Klaviyo |
|---|---|---|
| Provider | trycourier.com, Inc. | Klaviyo |
| Billing unit | sends | profiles |
| Plan at selected usage | Developer | Custom / unlisted usage pricing |
| Monthly estimate | $0/mo | Custom / not listed |
| Workload | 0 sends | 10K profiles |
| Free access | Developer plan includes 10,000 free sends per month with journeys, broadcasts, SDKs, CLI, and MCP server support. | Limited free plan |
| Published plans | Developer, Business, Enterprise | Free |
| Prices checked | 2026-10-08 | 2026-10-08 |
- Courier
- trycourier.com, Inc.
- Klaviyo
- Klaviyo
- Courier
- sends
- Klaviyo
- profiles
- Courier
- Developer
- Klaviyo
- Custom / unlisted usage pricing
- Courier
- $0/mo
- Klaviyo
- Custom / not listed
- Courier
- 0 sends
- Klaviyo
- 10K profiles
- Courier
- Developer plan includes 10,000 free sends per month with journeys, broadcasts, SDKs, CLI, and MCP server support.
- Klaviyo
- Limited free plan
- Courier
- Developer, Business, Enterprise
- Klaviyo
- Free
- Courier
- 2026-10-08
- Klaviyo
- 2026-10-08
Email APIs monthly cost
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 | Courier | Klaviyo |
|---|---|---|
| Number of notification | 10,000 per month | Not listed |
| Log retention | 7 days | Not listed |
- Courier
- 10,000 per month
- Klaviyo
- Not listed
- Courier
- 7 days
- Klaviyo
- Not listed
Which email providers fit your needs?
Courier features & plan notes
- 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
- 10,000 sends per month
- Journeys & broadcasts
- MCP server, CLI, & SDKs
- SSO via Google, Github
- Email & chat support
Klaviyo features & plan notes
- E-commerce data
- Omnichannel
- Shopify ecosystem
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