head to head · open source
CL4R1T4S vs AutoPrompt
CL4R1T4S has 50,059 GitHub stars, 10,280 forks, 127 open issues and last shipped 10 days ago. AutoPrompt has 3,019 stars, 265 forks, 23 open issues and last shipped 10 months ago. CL4R1T4S leads on adoption by 1,558% (50,059 vs 3,019 stars). CL4R1T4S is written in various languages under AGPL-3.0; AutoPrompt is written in Python under Apache-2.0. CL4R1T4S has attracted 21% as many forks as stars, AutoPrompt 9%. CL4R1T4S 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
| CL4R1T4S | AutoPrompt | |
|---|---|---|
| GitHub stars | ★ 50K | ★ 3.0K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | — | Python |
| Last push | 2026-09-10 | 2025-12-02 |
| Forks | ⑂ 10K | ⑂ 265 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick CL4R1T4S if
- You weight community size — 50K stars and counting
- You want the AGPL-3.0 license terms
- You value the larger contributor base for long-term maintenance
pick AutoPrompt if
- You want the AutoPrompt feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and AutoPrompt fits your workflow better
About CL4R1T4S
CL4R1T4S is an AGPL 3.0 repository of full extracted system prompts, guidelines and tools from the major AI models and agents — ChatGPT, Claude, Gemini, Grok, Perplexity, Cursor, Lovable, Replit and more — for anyone who wants to know what instructions sit behind the AI systems they use.
read the full CL4R1T4S overview →
About AutoPrompt
AutoPrompt is an open source Python framework, released under the Apache 2.0 licence, that improves and perfects prompts for large language models by applying an Intent based Prompt Calibration method, and it is built for developers, ML engineers, and product teams who need robust production grade prompts without doing all of the prompt engineering by hand.
read the full AutoPrompt overview →
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Frequently asked questions
Is CL4R1T4S or AutoPrompt more popular?
CL4R1T4S has 50,059 GitHub stars and AutoPrompt has 3,019. CL4R1T4S has the larger community by that measure.
Are CL4R1T4S and AutoPrompt free?
Both are open source. CL4R1T4S is licensed under AGPL-3.0 and AutoPrompt under Apache-2.0. Neither carries a licence fee.
What is the difference between CL4R1T4S and AutoPrompt?
CL4R1T4S is written in various languages and AutoPrompt 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, CL4R1T4S or AutoPrompt?
Choose CL4R1T4S if you want the larger community (50,059 stars) or its AGPL-3.0 licence terms. Choose AutoPrompt if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.