head to head · open source
Fizzy vs lotti
Fizzy has 8,212 GitHub stars, 1,194 forks, 67 open issues and last shipped yesterday. lotti has 1,175 stars, 119 forks, 4 open issues and last shipped today. Fizzy leads on adoption by 599% (8,212 vs 1,175 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%. lotti 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 | ★ 8.2K | ★ 1.2K |
| License | Custom / other | GPL-3.0 |
| Written in | Ruby | Dart |
| Last push | 2026-09-19 | 2026-09-20 |
| Forks | ⑂ 1.2K | ⑂ 119 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Fizzy if
- You weight community size — 8.2K 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 is an open source kanban tool for tracking issues and ideas, published by 37signals as a Ruby on Rails application, and it is aimed at teams that want a fast, simple board together with the source code and the option to run that board on their own server.
read the full Fizzy overview →
About lotti
Lotti is an open source, end to end encrypted logbook for individuals who want a private, local first record of the work they actually did, staffed by persistent AI agents that read what is recorded and propose the next change for the user to approve.
read the full lotti overview →
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Frequently asked questions
Is Fizzy or lotti more popular?
Fizzy has 8,212 GitHub stars and lotti has 1,175. 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 (8,212 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.