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Promptfoo vs Langfuse: catalog facts
Promptfoo	Langfuse
Freemium The open-source CLI is free; enterprise features are sold separately.	Freemium Open source for self-hosting, with a hosted version that can be started for free.
Command line	Web, Self-hosted
Runs from the command line with a single npx command Compares prompts and models side by side	Tracing, prompt management and evaluation in one tool Can be self-hosted or used as a hosted service
Red-teaming features are intended for authorized testing of your own applications Some reporting features belong to the paid enterprise edition	Requires instrumenting your application with its SDK Self-hosting means running and maintaining the server yourself
Downloadable app	Self-hosted, Hosted service
Open source	Open source
License not stated	License not stated
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.