head to head
Resend vs MailerSend
React Email-first sending versus a modern API with visual template tooling.
What matters for teams choosing a transactional API
Judged purely as an API. What the request contract guarantees on retry, how complete the webhook event coverage is, whether suppressions are readable and writable programmatically, and how much the message log retains when something needs debugging in production.
| Priority | Resend | MailerSend |
|---|---|---|
| Idempotency keys | Yes | No |
| Webhooks | Yes | Yes |
| Event stream | Yes | Yes |
| Operating since | 2023 | 2020 |
| Suppressions API | Yes | Yes |
| Best published rate per 1,000 | $0.35 | Tiers not published in comparable form |
| Batch sending | Yes | Yes |
| SDKs | node, python, go, ruby, php, rust, java, elixir, cli | node, python, go, ruby, php |
| Deliverability | Acceptable, but the deliverability track record is shorter than Postmark or SendGrid. Independent inbox-placement studies vary. Dedicated IPs are available on higher tiers. | Good and steadily improving; reputation managed via dedicated IP options on paid plans. |
For a transactional workload running high-frequency programmatic sends where a missed delivery is a product failure, Resend takes idempotency keys and SDK breadth, while MailerSend takes operating track record. That ordering reflects this audience. Weigh the same table differently and the answer changes.
Side by side
| Feature | Resend | MailerSend |
|---|---|---|
| Webhooks | Yes | Yes |
| SDKs | node, python, go, ruby, php, rust, java, elixir, cli | node, python, go, ruby, php |
| Deliverability | Acceptable, but the deliverability track record is shorter than Postmark or SendGrid. Independent inbox-placement studies vary. Dedicated IPs are available on higher tiers. | Good and steadily improving; reputation managed via dedicated IP options on paid plans. |
| Tagline | Email API tightly coupled to React Email. | Modern transactional API with a clean UI. |
| Free tier | 3,000/mo permanent, capped at 100/day, one domain | 500/mo permanent |
| Starts at | $20/mo for 50,000 emails | $7/mo for 5,000 emails |
| Pricing model | tiered | tiered |
| API | Yes | Yes |
| SMTP | Yes | Yes |
| Templates | react-email | rich |
| React Email | Yes | No |
| Inbound | Yes | Yes |
| Multi-tenant | No | Yes |
| Idempotency | Yes | No |
| Dedicated IP | Yes | Yes |
| DX score | 8/10 | 8/10 |
| Best for | Early-stage React or Next.js product teams sending under 50k/mo. | Teams that want both API and visual template editing. |
Resend
pros
- ›Idiomatic SDKs across major languages
- ›React Email integration is the smoothest of any provider
- ›Idempotency keys supported
- ›Clean dashboard and event log
cons
- ›Volume pricing is significantly higher than AWS SES at large volumes
- ›Founded 2023, so deliverability track record and incident history are still building
- ›No drag-and-drop template editor; non-React stacks get a thinner experience
- ›Free tier is capped at 100 sends a day, so a 3,000/mo allowance cannot absorb a launch spike
- ›January 2024 breach exposed email metadata, contacts, and encrypted API tokens for all users; message bodies were not reached
- ›Status page logged roughly ten incidents in the three weeks to 2026-08-01, mostly outside the sending path: dashboard, webhooks, domain verification, and automations
- ›Single-region historically; multi-region setup is newer
- ›Smaller support footprint than Twilio SendGrid or Sinch Mailgun
MailerSend
pros
- ›Drag-and-drop templates plus API
- ›Inbound routing supported
- ›Sub-accounts for agencies
cons
- ›Smaller SDK footprint than SendGrid
- ›Brand and ecosystem less recognized than older providers