Langfuse vs Promptfoo

Compare the essentials. Check the sources. Choose for your task.

Which option fits your task?

No clear overall leader

The available profile signals have the same combined score. Check your requirements against the sources.

Sources and evidence gaps

Profile signals

Combined signal:: Equal comparison score
Open-source option:: Langfuse
Recorded adoption events:: No adoption records listed
Developer reviews:: No developer reviews yet
Repository stars:: Langfuse

The score combines listed API, open-source, docs and repository fields with capped adoption, review and star counts. These signals do not establish verified product use or fit.

Confirm the open-source license and deployment requirements in its sources.

Source links

Not listed in these profiles

Langfuse: developer reviews, recorded adoption events, benchmarks.
Promptfoo: developer reviews, recorded adoption events, benchmarks.

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At a glance

Typical use is inferred from profile information. Check the linked docs against your requirements.

Product capabilities
Criterion	Langfuse	Promptfoo
Typical use (inferred)	LLM app monitoring/evals	LLM app monitoring/evals
Category	Observability	Observability
Pricing model	Freemium	Open source
Open source	Listed	Listed
API	Available	Available
Docs	Read docs	Read docs

Developer tradeoffs

Inferred from category and profile information; verify against your requirements.

Inferred developer guidance
Criterion	Langfuse	Promptfoo
Tradeoff (inferred)	More control and inspectability, but more setup and operational ownership.	More control and inspectability, but more setup and operational ownership.

Reviews, adoption and benchmarks

Supporting signals are separate from capabilities and evidence. Missing data is not a zero score.

Supporting product signals
Criterion	Langfuse	Promptfoo
Rating	No reviews	No reviews
GitHub	36,853 stars	26,809 stars
Adoption	Public evidence pending	Public evidence pending
Benchmark	No benchmark data	No benchmark data

Plan a build Draft findings

Use with an agent

Open comparison JSON API reference

Public catalog facts, source links, and evidence gaps. Your private workspace and buyer requirements are not included.

Sources support review; they do not certify product fit. Sponsored offers do not change comparison order or evidence. Saving does not contact vendors.

Optional offers

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