head to head · open source
useSend vs Hyvor Relay
useSend has 4,775 GitHub stars, 447 forks, 37 open issues and last shipped 3 days ago. Hyvor Relay has 920 stars, 65 forks, 56 open issues and last shipped yesterday. useSend leads on adoption by 419% (4,775 vs 920 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 | ★ 4.8K | ★ 920 |
| License | AGPL-3.0 | AGPL-3.0 |
| Written in | TypeScript | PHP |
| Last push | 2026-10-31 | 2026-11-02 |
| Forks | ⑂ 447 | ⑂ 65 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick useSend if
- You weight community size — 4.8K 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
The Open Source sending infrastructure. Learn more » Discord . Website · Issues About this project As most of email products out there, useSend also uses Amazon SES under the hood to send emails. We provide an open and alternative way to send emails reliably and cheaply with a great dashboard. You can also use useSend manage contacts and send bulk emails(newsletter, product updates etc). We will take care of the subscriptions. Currently we only support emails, but we plan to expand to other sending protocols like SMS, push notification and even whatsapp. We are currently in beta! Features [x] Add domains [x]…
read the full useSend overview →
About Hyvor Relay
Hyvor Relay Hyvor Relay is a self hosted, open source email API for developers. It uses SMTP to send emails using your own infrastructure. It is designed to be simple to self host, easy to manage and observe, and powerful enough to send millions of daily emails. Email API for Developers Self Hosting Docs Product Docs Features Self Hosted : Docker compose or swarm based deployment. Health Checks : Multiple health checks to ensure best performance and deliverability. Email API : Send emails using a simple API. Logs & SMTP Conversations : View send logs and SMTP conversations of sent emails up to 30 days. Multi…
read the full Hyvor Relay overview →
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Frequently asked questions
Is useSend or Hyvor Relay more popular?
useSend has 4,775 GitHub stars and Hyvor Relay has 920. 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 (4,775 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.