head to head · open source
giskard-oss vs arcjet-js
giskard-oss has 5,830 GitHub stars, 537 forks, 64 open issues and last shipped 2 days ago. arcjet-js has 683 stars, 32 forks, 11 open issues and last shipped 2 days ago. giskard-oss leads on adoption by 754% (5,830 vs 683 stars). giskard-oss is written in Python under Apache-2.0; arcjet-js is written in TypeScript under Apache-2.0. giskard-oss has attracted 9% as many forks as stars, arcjet-js 5%. arcjet-js 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, llm-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 | arcjet-js | |
|---|---|---|
| GitHub stars | ★ 5.8K | ★ 683 |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-09-18 | 2026-09-18 |
| Forks | ⑂ 537 | ⑂ 32 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick giskard-oss if
- You weight community size — 5.8K 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 arcjet-js if
- You want the arcjet-js feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and arcjet-js fits your workflow better
About giskard-oss
Giskard OSS is an open source Python library for evaluating, red teaming and testing LLM agents and RAG pipelines, built for developers, ML engineers and AI security teams that need reproducible checks on non deterministic systems.
read the full giskard-oss overview →
About arcjet-js
Arcjet for JavaScript is an Apache 2.0 TypeScript monorepo of runtime security packages that developers call directly inside JavaScript and TypeScript applications, so AI features and agents can detect prompt injection, authorize tool calls, redact sensitive data, and block bots and abuse before an action runs.
read the full arcjet-js overview →
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Frequently asked questions
Is giskard-oss or arcjet-js more popular?
giskard-oss has 5,830 GitHub stars and arcjet-js has 683. giskard-oss has the larger community by that measure.
Are giskard-oss and arcjet-js free?
Both are open source. giskard-oss is licensed under Apache-2.0 and arcjet-js under Apache-2.0. Neither carries a licence fee.
What is the difference between giskard-oss and arcjet-js?
giskard-oss is written in Python and arcjet-js in TypeScript. 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 arcjet-js?
Choose giskard-oss if you want the larger community (5,830 stars) or its Apache-2.0 licence terms. Choose arcjet-js if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.