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DeepEval vs Langfuse: catalog facts
DeepEval	Langfuse
Free The framework is free and open source.	Freemium Open source for self-hosting, with a hosted version that can be started for free.
Command line	Web, Self-hosted
Treats LLM output checks like unit tests Very active development with a large user base	Tracing, prompt management and evaluation in one tool Can be self-hosted or used as a hosted service
Aimed at developers comfortable with Python code Evaluations that rely on a judge model may need API access to one	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.