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Promptfoo vs Evidently: catalog facts
Promptfoo	Evidently
Freemium The open-source CLI is free; enterprise features are sold separately.	Free Free and open source under the Apache 2.0 license.
Command line	Command line
Runs from the command line with a single npx command Compares prompts and models side by side	Covers both LLM systems and classic ML models Checks for drift, hallucinations and data leaks
Red-teaming features are intended for authorized testing of your own applications Some reporting features belong to the paid enterprise edition	Requires writing Python code to set up checks Some evaluations depend on access to a judge model
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: Apache-2.0
Not stated if an account is 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 September 26, 2026	Official website Full listing and sources Checked September 26, 2026

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