tinysend vs Resend
Resend is a developer-favorite email API with great DX, built primarily for sending transactional and broadcast email from your code. It can receive email by forwarding parsed messages to a webhook, and ships agent skills and an MCP server for coding agents. tinysend covers sending too, and adds a hosted inbox, subscriber management, public archives, and agent self-signup — an agent can register and send without a human creating an API key first.
They are aimed at different jobs. Here is the breakdown.
| capability | resend | tinysend |
|---|---|---|
| send email via API | yes | yes |
| hosted inbox for replies | webhook only | yes |
| newsletters | broadcasts | yes |
| subscriber management | basic audiences | yes |
| write from your email client | no | yes |
| custom domains | yes | yes |
| open tracking | yes | yes |
| public archive + RSS | no | yes |
| agent skills + MCP server | yes | yes |
| agent self-signup (auth.md) | manual key only | yes |
Pick Resend if you are a developer who mainly needs to send transactional and broadcast email from your own app, with React Email templates and a clean SDK.
Pick tinysend if you are running a newsletter, want to write from your inbox, want a hosted inbox for replies, or want an agent to sign up and send on its own.
Plenty of people use both: Resend for app transactional mail, tinysend for the newsletter and audience. See managing subscribers and custom domains.