ai red-teaming tools
ranked on what you can actually run today — because a third of this category has been acquired, and the three best options are free.
13 listed · 10 of them researched by us · featured first, then most upvoted
NeMo Guardrails
nvidia's toolkit for constraining llm behaviour, used alongside testing
HiddenLayer
we checked thisnot publishedfifty disclosed cves and thirty patents, across the broadest claimed scope here.
Promptfoo
we checked thisfreemit-licensed, free for ten thousand probes a month, and the only free tool here that tests agent tool access.
Garak
we checked thisfreeapache 2.0 from nvidia, twenty-plus probe modules, and a peer-reviewed paper behind it.
Adversa AI
we checked thisnot publishedthe most itemised attack taxonomy and the only vendor naming five compliance frameworks — behind a demo form.
PyRIT
we checked thisfreemicrosoft's mit-licensed red-team framework — build your own attacks, and the repository just moved.
Lakera
we checked thisfree tier availablethe only commercial vendor here you can start using without talking to anyone.
SPLX
we checked thisnot publishedpublishes red-team findings against named frontier models, and open-sourced the agent-mapping half of its product.
Mindgard
we checked thisnot publisheda hundred disclosures against systems you've heard of, from a lab with a decade of university research behind it.
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