head to head · open source
SkillSpector vs sapper-v2
SkillSpector has 25,664 GitHub stars, 2,266 forks, 136 open issues and last shipped yesterday. sapper-v2 has 2,018 stars, 1,029 forks, 3 open issues and last shipped 2 days ago. SkillSpector leads on adoption by 1,172% (25,664 vs 2,018 stars). SkillSpector is written in Python under Apache-2.0; sapper-v2 is written in Python under MIT. SkillSpector has attracted 9% as many forks as stars, sapper-v2 51%. SkillSpector was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai-security, claude-code), 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
| SkillSpector | sapper-v2 | |
|---|---|---|
| GitHub stars | ★ 26K | ★ 2.0K |
| License | Apache-2.0 | MIT |
| Written in | Python | Python |
| Last push | 2026-11-12 | 2026-11-11 |
| Forks | ⑂ 2.3K | ⑂ 1.0K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick SkillSpector if
- You weight community size — 26K 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 sapper-v2 if
- You want the sapper-v2 feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and sapper-v2 fits your workflow better
About SkillSpector
SkillSpector Security scanner for AI agent skills. Detect vulnerabilities, malicious patterns, and security risks before installing agent skills. Overview AI agent skills (used by Claude Code, Codex CLI, Gemini CLI, etc.) execute with implicit trust and minimal vetting. In the 31,132 skill analyzed subset of the research dataset, 26.1% of skills contain vulnerabilities and 5.2% show likely malicious intent . SkillSpector helps you answer: "Is this skill safe to install?" SkillSpector is part of the NVIDIA Verified Skills pipeline, which scans, evaluates, and signs agent skills before publication. Skills that…
read the full SkillSpector overview →
About sapper-v2
sapper v2 — The Autonomous Pentest Legion Champion of the 3rd Tencent Cloud Intelligent Attack Defense Challenge online qualifier (634 teams · 80.18/100 · 8 hours fully unattended) · First Prize , GeekCon 2026 AI Challenge Same 85 flags as the runner up, 25 seconds faster — on 1B tokens where they burned 4.5B. This was the first time an AI ape looked up at the stars. 📖 Full design article (WeChat, in Chinese) — the Nüwa Test, the three capability foundation, 18 iterations, emergence, and the taggant proposal. English 中文 ⚠️ AUTHORIZED SECURITY TESTING ONLY — see DISCLAIMER.md. Meet sapper in 60 seconds 🎬…
read the full sapper-v2 overview →
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Frequently asked questions
Is SkillSpector or sapper-v2 more popular?
SkillSpector has 25,664 GitHub stars and sapper-v2 has 2,018. SkillSpector has the larger community by that measure.
Are SkillSpector and sapper-v2 free?
Both are open source. SkillSpector is licensed under Apache-2.0 and sapper-v2 under MIT. Neither carries a licence fee.
What is the difference between SkillSpector and sapper-v2?
SkillSpector is written in Python and sapper-v2 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, SkillSpector or sapper-v2?
Choose SkillSpector if you want the larger community (25,664 stars) or its Apache-2.0 licence terms. Choose sapper-v2 if its feature set, stack or MIT licence fits better. Both are self-hostable.