head to head · open source
giskard-oss vs lean-ctx
giskard-oss has 5,911 GitHub stars, 554 forks, 64 open issues and last shipped today. lean-ctx has 3,890 stars, 353 forks, 9 open issues and last shipped yesterday. giskard-oss leads on adoption by 52% (5,911 vs 3,890 stars). giskard-oss is written in Python under Apache-2.0; lean-ctx is written in Rust under Apache-2.0. giskard-oss has attracted 9% as many forks as stars, lean-ctx 9%. giskard-oss was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ai-security), 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
| giskard-oss | lean-ctx | |
|---|---|---|
| GitHub stars | ★ 5.9K | ★ 3.9K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Rust |
| Last push | 2026-10-20 | 2026-10-19 |
| Forks | ⑂ 554 | ⑂ 353 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick giskard-oss if
- You weight community size — 5.9K 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 lean-ctx if
- You want the lean-ctx 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 lean-ctx fits your workflow better
About giskard-oss
Evals, Red Teaming and Test Generation for Agentic Systems Modular, Lightweight, Dynamic and Async first Docs • Website • Community [!IMPORTANT] Giskard v3 is a fresh rewrite designed for dynamic, multi turn testing of AI agents. This release drops heavy dependencies for better efficiency while introducing a more powerful AI vulnerability scanner and enhanced RAG evaluation — both now shipping natively in giskard scan , with no dependency on v2. Only the legacy scan for tabular/ML models remains v2 only. Giskard v2 remains available but is no longer actively maintained. Follow progress → Read the v3…
read the full giskard-oss overview →
About lean-ctx
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read the full lean-ctx overview →
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Frequently asked questions
Is giskard-oss or lean-ctx more popular?
giskard-oss has 5,911 GitHub stars and lean-ctx has 3,890. giskard-oss has the larger community by that measure.
Are giskard-oss and lean-ctx free?
Both are open source. giskard-oss is licensed under Apache-2.0 and lean-ctx under Apache-2.0. Neither carries a licence fee.
What is the difference between giskard-oss and lean-ctx?
giskard-oss is written in Python and lean-ctx 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, giskard-oss or lean-ctx?
Choose giskard-oss if you want the larger community (5,911 stars) or its Apache-2.0 licence terms. Choose lean-ctx if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.