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Inspect vs Promptfoo: catalog facts
Inspect	Promptfoo
Free Free and open source.	Freemium The open-source CLI is free; enterprise features are sold separately.
Web, Command line	Command line
Over 200 pre-built evaluations ready to run Sandboxed execution in Docker, Kubernetes and other systems	Runs from the command line with a single npx command Compares prompts and models side by side
Writing new evaluations requires Python Aimed at researchers rather than casual users	Red-teaming features are intended for authorized testing of your own applications Some reporting features belong to the paid enterprise edition
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 26, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.