head to head · open source
SkillSpector vs h5i
SkillSpector has 17,667 GitHub stars, 1,512 forks, 136 open issues and last shipped yesterday. h5i has 647 stars, 64 forks, 9 open issues and last shipped yesterday. SkillSpector leads on adoption by 2,631% (17,667 vs 647 stars). SkillSpector is written in Python under Apache-2.0; h5i is written in Rust under Apache-2.0. SkillSpector has attracted 9% as many forks as stars, h5i 10%. SkillSpector was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (agentic-ai, 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 | h5i | |
|---|---|---|
| GitHub stars | ★ 18K | ★ 647 |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Rust |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 1.5K | ⑂ 64 |
| 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 h5i if
- You want the h5i feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Rust
- You evaluated both and h5i 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 h5i
The Red Teaming Browser for AI Agents h5i (pronounced high five ) is a lightweight browser built for AI agents to test web applications. It combines page automation with direct control over HTTP traffic, letting agents capture, inspect, modify, replay, and compare requests through one interface. Sandboxing, network policies, credential isolation, and auditable sessions keep autonomous testing contained and within scope. Agent native red teaming Browser + direct HTTP control Attack replay in CI Replay attack flows in CI Sandboxed & auditable Isolated execution with logs Fast & lightweight 3× faster, 86% less memor…
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Frequently asked questions
Is SkillSpector or h5i more popular?
SkillSpector has 17,667 GitHub stars and h5i has 647. SkillSpector has the larger community by that measure.
Are SkillSpector and h5i free?
Both are open source. SkillSpector is licensed under Apache-2.0 and h5i under Apache-2.0. Neither carries a licence fee.
What is the difference between SkillSpector and h5i?
SkillSpector is written in Python and h5i in Rust. 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 h5i?
Choose SkillSpector if you want the larger community (17,667 stars) or its Apache-2.0 licence terms. Choose h5i if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.