head to head · open source
Fizzy vs lotti
Fizzy has 8,283 GitHub stars, 1,211 forks, 67 open issues and last shipped today. lotti has 1,204 stars, 120 forks, 4 open issues and last shipped today. Fizzy leads on adoption by 588% (8,283 vs 1,204 stars). Fizzy is written in Ruby under a custom or non-standard licence; lotti is written in Dart under GPL-3.0. Fizzy has attracted 15% as many forks as stars, lotti 10%. Fizzy 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.
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Side by side
| Fizzy | lotti | |
|---|---|---|
| GitHub stars | ★ 8.3K | ★ 1.2K |
| License | Custom / other | GPL-3.0 |
| Written in | Ruby | Dart |
| Last push | 2026-11-05 | 2026-11-05 |
| Forks | ⑂ 1.2K | ⑂ 120 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Fizzy if
- You weight community size — 8.3K stars and counting
- You want the Custom / other license terms
- Your stack matches Ruby
- You value the larger contributor base for long-term maintenance
pick lotti if
- You want the lotti feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches Dart
- You evaluated both and lotti fits your workflow better
About Fizzy
Fizzy This is the source code of Fizzy, the Kanban tracking tool for issues and ideas by 37signals. Running your own Fizzy instance If you want to run your own Fizzy instance, but don't need to change its code, you can use our pre built Docker image. You'll need access to a server on which you can run Docker, and you'll need to configure some options to customize your installation. You can find the details of how to do a Docker based deployment in our Docker deployment guide. If you want more flexibility to customize your Fizzy installation by changing its code, and deploy those changes to your server, then we…
read the full Fizzy overview →
About lotti
Lotti Discord for support A private logbook for the work you actually did. Lotti records what you meant to do and what actually happened, and keeps them as separate facts. Tasks, planned blocks, tracked time, voice notes, journal entries, habits, and health data live in a local database on your own devices, looked after by a staff of personal AI assistants: persistent agents that read what you record, keep the mess summarised, and propose the next step — while proposed changes wait for your approval. No server ever holds your data in readable form; sync is end to end encrypted, and the relay between your devices…
read the full lotti overview →
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Frequently asked questions
Is Fizzy or lotti more popular?
Fizzy has 8,283 GitHub stars and lotti has 1,204. Fizzy has the larger community by that measure.
Are Fizzy and lotti free?
Both are open source. Fizzy has no licence declared in this registry, and lotti is licensed under GPL-3.0. Both are free to self-host.
What is the difference between Fizzy and lotti?
Fizzy is written in Ruby and lotti in Dart. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Fizzy or lotti?
Choose Fizzy if you want the larger community (8,283 stars) or its Custom / other licence terms. Choose lotti if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.