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lm-evaluation-harness vs Promptfoo: catalog facts
lm-evaluation-harness	Promptfoo
Free Free and open source.	Freemium The open-source CLI is free; enterprise features are sold separately.
Windows, macOS, Linux, Command line	Command line
Hundreds of benchmark tasks in one tool New tasks defined through YAML templates	Runs from the command line with a single npx command Compares prompts and models side by side
Command-line and Python only, no graphical interface Running large benchmarks needs substantial compute	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: MIT	License not stated
No account needed	Not stated if an account is needed
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.