head to head · open source
SkillSpector vs beelzebub
SkillSpector has 17,624 GitHub stars, 1,504 forks, 136 open issues and last shipped yesterday. beelzebub has 2,177 stars, 209 forks, 5 open issues and last shipped 4 days ago. SkillSpector leads on adoption by 710% (17,624 vs 2,177 stars). SkillSpector is written in Python under Apache-2.0; beelzebub is written in Go under GPL-3.0. SkillSpector has attracted 9% as many forks as stars, beelzebub 10%. 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 | beelzebub | |
|---|---|---|
| GitHub stars | ★ 18K | ★ 2.2K |
| License | Apache-2.0 | GPL-3.0 |
| Written in | Python | Go |
| Last push | 2026-09-17 | 2026-09-14 |
| Forks | ⑂ 1.5K | ⑂ 209 |
| 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 beelzebub if
- You want the beelzebub feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches Go
- You evaluated both and beelzebub 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 beelzebub
Beelzebub is an open source deception runtime framework written in Go and released under GPL 3.0. It operates in the cybersecurity and AI security ecosystem, where teams need controlled systems that attract and record activity aimed at decoy services. The project is a configurable runtime for honeypots, decoys, and agent facing bait tools, with documentation at docs.beelzebub.ai.
read the full beelzebub overview →
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Frequently asked questions
Is SkillSpector or beelzebub more popular?
SkillSpector has 17,624 GitHub stars and beelzebub has 2,177. SkillSpector has the larger community by that measure.
Are SkillSpector and beelzebub free?
Both are open source. SkillSpector is licensed under Apache-2.0 and beelzebub under GPL-3.0. Neither carries a licence fee.
What is the difference between SkillSpector and beelzebub?
SkillSpector is written in Python and beelzebub in Go. 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 beelzebub?
Choose SkillSpector if you want the larger community (17,624 stars) or its Apache-2.0 licence terms. Choose beelzebub if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.