head to head · open source
promptfoo vs cangjie-skill
promptfoo has 25,297 GitHub stars, 2,344 forks, 651 open issues and last shipped today. cangjie-skill has 10,331 stars, 1,198 forks, 23 open issues and last shipped 7 days ago. promptfoo leads on adoption by 145% (25,297 vs 10,331 stars). promptfoo is written in TypeScript under MIT; cangjie-skill is written in Python under MIT. promptfoo has attracted 9% as many forks as stars, cangjie-skill 12%. promptfoo was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (prompt-engineering), 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
| promptfoo | cangjie-skill | |
|---|---|---|
| GitHub stars | ★ 25K | ★ 10K |
| License | MIT | MIT |
| Written in | TypeScript | Python |
| Last push | 2026-09-20 | 2026-09-13 |
| Forks | ⑂ 2.3K | ⑂ 1.2K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick promptfoo if
- You weight community size — 25K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick cangjie-skill if
- You want the cangjie-skill feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and cangjie-skill fits your workflow better
About promptfoo
Promptfoo is an open source command line tool and TypeScript library for evaluating and red teaming large language model applications, aimed at developers, AI engineers, and security teams who need measurable evidence that a prompt, agent, or retrieval augmented generation pipeline behaves correctly and safely before it reaches users.
read the full promptfoo overview →
About cangjie-skill
Cangjie Skill is an MIT licensed Python tool that distills methodologies from books, long form videos, and podcasts into callable AI Skills, built for developers and knowledge workers who assemble agent workflows on OpenClaw, Claude Code, or DeepSeek Harness.
read the full cangjie-skill overview →
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Frequently asked questions
Is promptfoo or cangjie-skill more popular?
promptfoo has 25,297 GitHub stars and cangjie-skill has 10,331. promptfoo has the larger community by that measure.
Are promptfoo and cangjie-skill free?
Both are open source. promptfoo is licensed under MIT and cangjie-skill under MIT. Neither carries a licence fee.
What is the difference between promptfoo and cangjie-skill?
promptfoo is written in TypeScript and cangjie-skill in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, promptfoo or cangjie-skill?
Choose promptfoo if you want the larger community (25,297 stars) or its MIT licence terms. Choose cangjie-skill if its feature set, stack or MIT licence fits better. Both are self-hostable.