head to head · open source
Bluesky vs postmarks
Bluesky has 18,295 GitHub stars, 2,837 forks, 2,400 open issues and last shipped yesterday. postmarks has 546 stars, 42 forks, 78 open issues and last shipped 4 months ago. Bluesky leads on adoption by 3,251% (18,295 vs 546 stars). Bluesky is written in TypeScript under MIT; postmarks is written in JavaScript under MIT. Bluesky has attracted 16% as many forks as stars, postmarks 8%. Bluesky was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| Bluesky | postmarks | |
|---|---|---|
| GitHub stars | ★ 18K | ★ 546 |
| License | MIT | MIT |
| Written in | TypeScript | JavaScript |
| Last push | 2026-09-17 | 2026-05-15 |
| Forks | ⑂ 2.8K | ⑂ 42 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Bluesky if
- You weight community size — 18K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick postmarks if
- You want the postmarks feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and postmarks fits your workflow better
About Bluesky
Bluesky is the open source social application codebase for the Bluesky Social app. It lives in the AT Protocol ecosystem, also called atproto, and it is written in TypeScript as a React Native application. The project provides client code for Web, iOS, and Android, and it builds on open source atproto packages such as @atproto/api, which live in a separate repository.
read the full Bluesky overview →
About postmarks
Postmarks is a single user bookmarking website that you host yourself and connect to the Fediverse, built for one person who wants to own their bookmarks while still sharing them with Mastodon, FireFish, and any other text based ActivityPub platform.
read the full postmarks overview →
More in Community & Social
Related comparisons
More Social Networking projects
Compare either of these against the rest of the Social Networking field.
Frequently asked questions
Is Bluesky or postmarks more popular?
Bluesky has 18,295 GitHub stars and postmarks has 546. Bluesky has the larger community by that measure.
Are Bluesky and postmarks free?
Both are open source. Bluesky is licensed under MIT and postmarks under MIT. Neither carries a licence fee.
What is the difference between Bluesky and postmarks?
Bluesky is written in TypeScript and postmarks in JavaScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Bluesky or postmarks?
Choose Bluesky if you want the larger community (18,295 stars) or its MIT licence terms. Choose postmarks if its feature set, stack or MIT licence fits better. Both are self-hostable.