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

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