head to head · open source
iFixAi vs sapper-v2
iFixAi has 44,973 GitHub stars, 1,789 forks, 2 open issues and last shipped 2 days ago. sapper-v2 has 2,018 stars, 1,029 forks, 3 open issues and last shipped 2 days ago. iFixAi leads on adoption by 2,129% (44,973 vs 2,018 stars). iFixAi is written in Python under Apache-2.0; sapper-v2 is written in Python under MIT. iFixAi has attracted 4% as many forks as stars, sapper-v2 51%. iFixAi 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
| iFixAi | sapper-v2 | |
|---|---|---|
| GitHub stars | ★ 45K | ★ 2.0K |
| License | Apache-2.0 | MIT |
| Written in | Python | Python |
| Last push | 2026-11-11 | 2026-11-11 |
| Forks | ⑂ 1.8K | ⑂ 1.0K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick iFixAi if
- You weight community size — 45K 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 iFixAi
iFixAi English · 简体中文 · 日本語 · 한국어 Independent Auditing of AI Agents Catch your agent's mistakes and blind spots before the shit hits the fan. Quick start • Three ways to run • Test your agent • Scoring • Docs • Contributing One ifixai run , end to end: guided setup picks the system, judge, and suite; the run verifies the connection and saves your config; 32 inspections execute across five pillars; and the result lands as an A–F grade with a scored core pillar scorecard. What it is The existing Eval, Red teaming, and Observability Tools are evaluating the agent mainly based on tech capability (token efficiency…
read the full iFixAi 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 iFixAi or sapper-v2 more popular?
iFixAi has 44,973 GitHub stars and sapper-v2 has 2,018. iFixAi has the larger community by that measure.
Are iFixAi and sapper-v2 free?
Both are open source. iFixAi is licensed under Apache-2.0 and sapper-v2 under MIT. Neither carries a licence fee.
What is the difference between iFixAi and sapper-v2?
iFixAi 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, iFixAi or sapper-v2?
Choose iFixAi if you want the larger community (44,973 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.