head to head · open source
SkillSpector vs FuzzyAI
SkillSpector has 17,624 GitHub stars, 1,504 forks, 136 open issues and last shipped yesterday. FuzzyAI has 1,574 stars, 216 forks, 7 open issues and last shipped 7 months ago. SkillSpector leads on adoption by 1,020% (17,624 vs 1,574 stars). SkillSpector is written in Python under Apache-2.0; FuzzyAI is written in Jupyter Notebook under Apache-2.0. SkillSpector has attracted 9% as many forks as stars, FuzzyAI 14%. SkillSpector was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| SkillSpector | FuzzyAI | |
|---|---|---|
| GitHub stars | ★ 18K | ★ 1.6K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Jupyter Notebook |
| Last push | 2026-09-17 | 2026-02-06 |
| Forks | ⑂ 1.5K | ⑂ 216 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick SkillSpector if
- You weight community size — 18K 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 SkillSpector
SkillSpector is an open source security scanner for AI agent skills that detects vulnerabilities, malicious patterns, prompt injection, data exfiltration, and supply chain risk in Claude Code, Codex CLI, Gemini CLI, and MCP skills before they are installed — built for developers who install agent skills and for security teams that vet or publish them.
read the full SkillSpector 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 SkillSpector or FuzzyAI more popular?
SkillSpector has 17,624 GitHub stars and FuzzyAI has 1,574. SkillSpector has the larger community by that measure.
Are SkillSpector and FuzzyAI free?
Both are open source. SkillSpector is licensed under Apache-2.0 and FuzzyAI under Apache-2.0. Neither carries a licence fee.
What is the difference between SkillSpector and FuzzyAI?
SkillSpector 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, SkillSpector or FuzzyAI?
Choose SkillSpector if you want the larger community (17,624 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.