head to head · open source
useSend vs Hyvor Relay
useSend has 4,686 GitHub stars, 421 forks, 37 open issues and last shipped 10 days ago. Hyvor Relay has 897 stars, 63 forks, 56 open issues and last shipped yesterday. useSend leads on adoption by 422% (4,686 vs 897 stars). useSend is written in TypeScript under AGPL-3.0; Hyvor Relay is written in PHP under AGPL-3.0. useSend has attracted 9% as many forks as stars, Hyvor Relay 7%. Hyvor Relay was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (email), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| useSend | Hyvor Relay | |
|---|---|---|
| GitHub stars | ★ 4.7K | ★ 897 |
| License | AGPL-3.0 | AGPL-3.0 |
| Written in | TypeScript | PHP |
| Last push | 2026-09-08 | 2026-09-17 |
| Forks | ⑂ 421 | ⑂ 63 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick useSend if
- You weight community size — 4.7K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Hyvor Relay if
- You want the Hyvor Relay feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches PHP
- You evaluated both and Hyvor Relay fits your workflow better
About useSend
useSend is open source sending infrastructure, positioned directly as an alternative to Resend, Sendgrid and Postmark, and written in TypeScript under the AGPL 3.0 license. It lives in the email and communication ecosystem, filed under Productivity & Utilities / Email & Communication. Like most email products on the market, it uses Amazon SES under the hood to transmit messages, and it wraps that delivery layer in an open dashboard for sending reliably and cheaply. The project's stated premise is simple: pay per email sent, rather than paying for contact storage. The repository carries 4676 stars, 421 forks and 3…
read the full useSend overview →
About Hyvor Relay
Hyvor Relay is an open source email API aimed at developers, written primarily in PHP with Symfony for the API backend and Go for the email workers, webhook handlers, DNS server, and incoming SMTP server. The frontend is built with SvelteKit and the Hyvor Design System, and PostgreSQL serves both as the database and as the queue. It lives in the PHP and Go ecosystems, is licensed under AGPL 3.0, and is positioned as a cloud and self hosted alternative to SES, Mailgun, and SendGrid.
read the full Hyvor Relay overview →
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Frequently asked questions
Is useSend or Hyvor Relay more popular?
useSend has 4,686 GitHub stars and Hyvor Relay has 897. useSend has the larger community by that measure.
Are useSend and Hyvor Relay free?
Both are open source. useSend is licensed under AGPL-3.0 and Hyvor Relay under AGPL-3.0. Neither carries a licence fee.
What is the difference between useSend and Hyvor Relay?
useSend is written in TypeScript and Hyvor Relay in PHP. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, useSend or Hyvor Relay?
Choose useSend if you want the larger community (4,686 stars) or its AGPL-3.0 licence terms. Choose Hyvor Relay if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.