head to head · open source
humanizer vs CL4R1T4S
humanizer has 64,488 GitHub stars, 5,085 forks, 13 open issues and last shipped 8 days ago. CL4R1T4S has 51,737 stars, 10,551 forks, 127 open issues and last shipped 1 months ago. humanizer leads on adoption by 25% (64,488 vs 51,737 stars). humanizer is written in Python under MIT; CL4R1T4S is written in various languages under AGPL-3.0. humanizer has attracted 8% as many forks as stars, CL4R1T4S 20%. humanizer was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (chatgpt, 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 | CL4R1T4S | |
|---|---|---|
| GitHub stars | ★ 64K | ★ 52K |
| License | MIT | AGPL-3.0 |
| Written in | Python | — |
| Last push | 2026-10-28 | 2026-09-22 |
| Forks | ⑂ 5.1K | ⑂ 11K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick humanizer if
- You weight community size — 64K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick CL4R1T4S if
- You want the CL4R1T4S feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- You evaluated both and CL4R1T4S 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 CL4R1T4S
CL4R1T4S AI SYSTEMS TRANSPARENCY AND OBSERVABILITY FOR ALL! Full extracted system prompts, guidelines, and tools from OpenAI, Google, Anthropic, xAI, Perplexity, Cursor, Windsurf, Devin, Manus, Replit, and more – virtually all major AI models + agents! 📌 Why This Exists "In order to trust the output, one must understand the input." AI labs shape how models behave using massive, unseen prompt scaffolds. Because AI is a trusted external intelligence layer for a growing number of humans, these hidden instructions can affect the perceptions and behavior of the public. These prompts define: What AIs can’t say What…
read the full CL4R1T4S overview →
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Frequently asked questions
Is humanizer or CL4R1T4S more popular?
humanizer has 64,488 GitHub stars and CL4R1T4S has 51,737. humanizer has the larger community by that measure.
Are humanizer and CL4R1T4S free?
Both are open source. humanizer is licensed under MIT and CL4R1T4S under AGPL-3.0. Neither carries a licence fee.
What is the difference between humanizer and CL4R1T4S?
humanizer is written in Python and CL4R1T4S in various languages. 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 CL4R1T4S?
Choose humanizer if you want the larger community (64,488 stars) or its MIT licence terms. Choose CL4R1T4S if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.