head to head · open source
nanobot vs Kai
nanobot has 48,372 GitHub stars, 8,548 forks, 775 open issues and last shipped today. Kai has 1,255 stars, 185 forks, 127 open issues and last shipped 2 days ago. nanobot leads on adoption by 3,754% (48,372 vs 1,255 stars). nanobot is written in Python under MIT; Kai is written in Kotlin under Apache-2.0. nanobot has attracted 18% as many forks as stars, Kai 15%. nanobot was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (chatbot), 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
| nanobot | Kai | |
|---|---|---|
| GitHub stars | ★ 48K | ★ 1.3K |
| License | MIT | Apache-2.0 |
| Written in | Python | Kotlin |
| Last push | 2026-09-20 | 2026-09-18 |
| Forks | ⑂ 8.5K | ⑂ 185 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick nanobot if
- You weight community size — 48K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Kai if
- You want the Kai feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Kotlin
- You evaluated both and Kai fits your workflow better
About nanobot
nanobot is an ultra lightweight, open source, self hosted personal AI agent framework written in Python, aimed at individual developers and small teams who want to run their own agent through a browser WebUI, a terminal, or chat apps instead of renting a hosted assistant.
read the full nanobot overview →
About Kai
Kai 9000 is an Apache 2.0 licensed, open source AI assistant written in Kotlin that runs with persistent memory across Android, iOS, Windows, macOS, Linux, and the web, built for people who want a personal assistant that keeps its context and works on their own devices.
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Frequently asked questions
Is nanobot or Kai more popular?
nanobot has 48,372 GitHub stars and Kai has 1,255. nanobot has the larger community by that measure.
Are nanobot and Kai free?
Both are open source. nanobot is licensed under MIT and Kai under Apache-2.0. Neither carries a licence fee.
What is the difference between nanobot and Kai?
nanobot is written in Python and Kai in Kotlin. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, nanobot or Kai?
Choose nanobot if you want the larger community (48,372 stars) or its MIT licence terms. Choose Kai if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.