head to head · open source
ComfyUI vs Kai
ComfyUI has 144,907 GitHub stars, 17,244 forks, 4,894 open issues and last shipped today. Kai has 1,330 stars, 210 forks, 127 open issues and last shipped 2 days ago. ComfyUI leads on adoption by 10,795% (144,907 vs 1,330 stars). ComfyUI is written in Python under GPL-3.0; Kai is written in Kotlin under Apache-2.0. ComfyUI has attracted 12% as many forks as stars, Kai 16%. ComfyUI was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ai), 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
| ComfyUI | Kai | |
|---|---|---|
| GitHub stars | ★ 145K | ★ 1.3K |
| License | GPL-3.0 | Apache-2.0 |
| Written in | Python | Kotlin |
| Last push | 2026-11-04 | 2026-11-02 |
| Forks | ⑂ 17K | ⑂ 210 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ComfyUI if
- You weight community size — 145K stars and counting
- You want the GPL-3.0 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 ComfyUI
ComfyUI The most powerful and modular AI engine for content creation. [![Website][website shield]][website url] [![Dynamic JSON Badge][discord shield]][discord url] [![Twitter][twitter shield]][twitter url] [![Matrix][matrix shield]][matrix url] [![][github release shield]][github release link] [![][github release date shield]][github release link] [![][github downloads shield]][github downloads link] [![][github downloads latest shield]][github downloads link] [matrix shield]: [matrix url]: [website shield]: [website url]: [discord shield]: [discord url]: [twitter shield]: [twitter url]: [github release…
read the full ComfyUI overview →
About Kai
Kai 9000 An open source AI assistant with persistent memory that runs on Android, iOS, Windows, Mac, Linux, and Web . Website Documentation Sponsor: Atlas Cloud Installation Homebrew (macOS): AUR (Arch Linux): Winget (Windows): Direct Downloads AI That Builds Screens, Not Just Text Kai 9000's Interactive UI lets the AI generate full interactive screens — quizzes, dashboards, recipes, brainstorms, and more. Navigate by tapping buttons instead of scrolling through chat. Features Persistent memory — Kai remembers important details across conversations and uses them automatically Customizable soul — Define the AI's…
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Frequently asked questions
Is ComfyUI or Kai more popular?
ComfyUI has 144,907 GitHub stars and Kai has 1,330. ComfyUI has the larger community by that measure.
Are ComfyUI and Kai free?
Both are open source. ComfyUI is licensed under GPL-3.0 and Kai under Apache-2.0. Neither carries a licence fee.
What is the difference between ComfyUI and Kai?
ComfyUI 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, ComfyUI or Kai?
Choose ComfyUI if you want the larger community (144,907 stars) or its GPL-3.0 licence terms. Choose Kai if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.