head to head · open source
garak vs arcjet-js
garak has 9,308 GitHub stars, 1,294 forks, 429 open issues and last shipped 4 days ago. arcjet-js has 683 stars, 32 forks, 11 open issues and last shipped 2 days ago. garak leads on adoption by 1,263% (9,308 vs 683 stars). garak is written in Python under Apache-2.0; arcjet-js is written in TypeScript under Apache-2.0. garak has attracted 14% 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 1 topic tag (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
| garak | arcjet-js | |
|---|---|---|
| GitHub stars | ★ 9.3K | ★ 683 |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-09-16 | 2026-09-18 |
| Forks | ⑂ 1.3K | ⑂ 32 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick garak if
- You weight community size — 9.3K 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 garak
garak is a free, Apache 2.0 command line vulnerability scanner for large language models that probes generative AI systems for hallucination, data leakage, prompt injection, misinformation, toxicity generation, and jailbreaks, and it is aimed at security engineers, red teamers, and AI developers who need to test the models they ship.
read the full garak 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 garak or arcjet-js more popular?
garak has 9,308 GitHub stars and arcjet-js has 683. garak has the larger community by that measure.
Are garak and arcjet-js free?
Both are open source. garak is licensed under Apache-2.0 and arcjet-js under Apache-2.0. Neither carries a licence fee.
What is the difference between garak and arcjet-js?
garak 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, garak or arcjet-js?
Choose garak if you want the larger community (9,308 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.