head to head · open source
humanizer vs promptfoo
humanizer has 64,789 GitHub stars, 5,109 forks, 13 open issues and last shipped 8 days ago. promptfoo has 26,835 stars, 2,650 forks, 651 open issues and last shipped yesterday. humanizer leads on adoption by 141% (64,789 vs 26,835 stars). humanizer is written in Python under MIT; promptfoo is written in TypeScript under MIT. humanizer has attracted 8% as many forks as stars, promptfoo 10%. promptfoo was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (llm, 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
| humanizer | promptfoo | |
|---|---|---|
| GitHub stars | ★ 65K | ★ 27K |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-10-28 | 2026-11-04 |
| Forks | ⑂ 5.1K | ⑂ 2.6K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick humanizer if
- You weight community size — 65K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick promptfoo if
- You want the promptfoo feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and promptfoo fits your workflow better
About humanizer
Humanizer Humanizer rewrites AI sounding text so it reads like a person wrote it, without changing what it says. Because it is just Markdown, it works with any agent that supports skills. Installation Install Humanizer with the Skills CLI: Leave off global to install Humanizer only in the current project. Add agent or agent ' ' to choose which agents receive it, then reload their skills. The skill answers to /humanizer . Claude Code 2.1.142 or newer can install the plugin instead: The plugin answers to /humanizer:humanizer . In Claude Desktop, download this repository as a ZIP and upload it as a skill. For a…
read the full humanizer overview →
About promptfoo
Promptfoo: LLM evals & red teaming promptfoo is a CLI and library for evaluating and red teaming LLM apps. Stop the trial and error approach start shipping secure, reliable AI apps. Website · Getting Started · Red Teaming · Documentation · Discord Promptfoo is now part of OpenAI. Promptfoo remains open source and MIT licensed. Read the company update. Quick Start Requires Node.js =22.22.0 for npm and npx usage. Node.js 24 LTS is recommended; see the runtime support guide. Also available via brew install promptfoo and pip install promptfoo . You can also use npx promptfoo@latest to run any command without…
read the full promptfoo overview →
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Frequently asked questions
Is humanizer or promptfoo more popular?
humanizer has 64,789 GitHub stars and promptfoo has 26,835. humanizer has the larger community by that measure.
Are humanizer and promptfoo free?
Both are open source. humanizer is licensed under MIT and promptfoo under MIT. Neither carries a licence fee.
What is the difference between humanizer and promptfoo?
humanizer is written in Python and promptfoo in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, humanizer or promptfoo?
Choose humanizer if you want the larger community (64,789 stars) or its MIT licence terms. Choose promptfoo if its feature set, stack or MIT licence fits better. Both are self-hostable.