head to head · open source
useSend vs Sessy
useSend has 4,686 GitHub stars, 421 forks, 37 open issues and last shipped 10 days ago. Sessy has 929 stars, 44 forks, 7 open issues and last shipped 3 days ago. useSend leads on adoption by 404% (4,686 vs 929 stars). useSend is written in TypeScript under AGPL-3.0; Sessy is written in Ruby under a custom or non-standard licence. useSend has attracted 9% as many forks as stars, Sessy 5%. Sessy 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.
← all 8884 open source comparisons
Side by side
| useSend | Sessy | |
|---|---|---|
| GitHub stars | ★ 4.7K | ★ 929 |
| License | AGPL-3.0 | Custom / other |
| Written in | TypeScript | Ruby |
| Last push | 2026-09-08 | 2026-09-15 |
| Forks | ⑂ 421 | ⑂ 44 |
| 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 Sessy if
- You want the Sessy feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Ruby
- You evaluated both and Sessy 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 Sessy
Sessy is an open source email observability tool for Amazon SES, built in Ruby on Rails by Marc Köhlbrugge and distributed under the O'Saasy License. It lives in the AWS ecosystem: you keep sending through raw SES, and Sessy supplies the interface that shows what happened to each message after it left your application. The repository carries the topics amazon ses, email, rails, and ruby, and the project's own homepage is sessy.do.
read the full Sessy overview →
More in Productivity & Utilities
Related comparisons
More Email & Communication projects
Compare either of these against the rest of the Email & Communication field.
Frequently asked questions
Is useSend or Sessy more popular?
useSend has 4,686 GitHub stars and Sessy has 929. useSend has the larger community by that measure.
Are useSend and Sessy free?
Both are open source. useSend is licensed under AGPL-3.0, and Sessy has no licence declared in this registry. Both are free to self-host.
What is the difference between useSend and Sessy?
useSend is written in TypeScript and Sessy in Ruby. 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 Sessy?
Choose useSend if you want the larger community (4,686 stars) or its AGPL-3.0 licence terms. Choose Sessy if its feature set, stack or Custom / other licence fits better. Both are self-hostable.