head to head · open source
garak vs FuzzyAI
garak has 9,308 GitHub stars, 1,294 forks, 429 open issues and last shipped 4 days ago. FuzzyAI has 1,576 stars, 217 forks, 7 open issues and last shipped 8 months ago. garak leads on adoption by 491% (9,308 vs 1,576 stars). garak is written in Python under Apache-2.0; FuzzyAI is written in Jupyter Notebook under Apache-2.0. garak has attracted 14% as many forks as stars, FuzzyAI 14%. garak was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (ai, llm-evaluation, llm-security), 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
| garak | FuzzyAI | |
|---|---|---|
| GitHub stars | ★ 9.3K | ★ 1.6K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Jupyter Notebook |
| Last push | 2026-09-16 | 2026-02-06 |
| Forks | ⑂ 1.3K | ⑂ 217 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick garak if
- You weight community size — 9.3K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick FuzzyAI if
- You want the FuzzyAI feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Jupyter Notebook
- You evaluated both and FuzzyAI fits your workflow better
About garak
garak is a free, Apache 2.0 command line vulnerability scanner for large language models that probes generative AI systems for hallucination, data leakage, prompt injection, misinformation, toxicity generation, and jailbreaks, and it is aimed at security engineers, red teamers, and AI developers who need to test the models they ship.
read the full garak overview →
About FuzzyAI
FuzzyAI is an open source fuzzer for large language model APIs. It lives in the AI security and red teaming ecosystem. It uses automated prompt mutation to test whether a model or API accepts jailbreak attempts. The project helps developers and security researchers find, evaluate, and reduce exposure to harmful or unwanted model behavior.
read the full FuzzyAI overview →
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Frequently asked questions
Is garak or FuzzyAI more popular?
garak has 9,308 GitHub stars and FuzzyAI has 1,576. garak has the larger community by that measure.
Are garak and FuzzyAI free?
Both are open source. garak is licensed under Apache-2.0 and FuzzyAI under Apache-2.0. Neither carries a licence fee.
What is the difference between garak and FuzzyAI?
garak is written in Python and FuzzyAI in Jupyter Notebook. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, garak or FuzzyAI?
Choose garak if you want the larger community (9,308 stars) or its Apache-2.0 licence terms. Choose FuzzyAI if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.