verifier.org

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

#guardrails#open-source

Giskard

open-source scanner for llm vulnerabilities and quality regressions

#open-source#scanner

ModelScan

scans model files for unsafe serialisation before you load them

#supply-chain#open-source

HiddenLayer

we checked thisnot published

fifty disclosed cves and thirty patents, across the broadest claimed scope here.

#enterprises-wanting-mode

Promptfoo

we checked thisfree

mit-licensed, free for ten thousand probes a month, and the only free tool here that tests agent tool access.

#any-team-that-wants-to-s

Garak

we checked thisfree

apache 2.0 from nvidia, twenty-plus probe modules, and a peer-reviewed paper behind it.

#scanning-a-specific-mode#with-something-citable-t

Adversa AI

we checked thisnot published

the most itemised attack taxonomy and the only vendor naming five compliance frameworks — behind a demo form.

#teams-securing-ai-coding#where-its-current-flagsh

PyRIT

we checked thisfree

microsoft's mit-licensed red-team framework — build your own attacks, and the repository just moved.

#security-teams-with-engi

Lakera

we checked thisfree tier available

the only commercial vendor here you can start using without talking to anyone.

#smaller-teams-wanting-ru

SPLX

we checked thisnot published

publishes red-team findings against named frontier models, and open-sourced the agent-mapping half of its product.

#teams-wanting-to-map-an-

Mindgard

we checked thisnot published

a hundred disclosures against systems you've heard of, from a lab with a decade of university research behind it.

#buyers-who-weight-demons

Gray Swan AI

we checked thisnot published

runs a public attack competition that finds real exploits — and describes its actual product in adjectives.

#frontier-labs-commission#researchers-wanting-to-c

Repello AI

we checked thisfree scan available

a free scan you can run without a sales call, behind numbers nothing supports.

#a-no-commitment-first-lo

missing something? a free listing takes two minutes, $50 pins it to the top of this page.

add a tool →