Pick Evidently if
mL / LLM teams who will run Evidently locally at $0 — not Arize first unless they want hosted Signal at $50.
Read the Evidently pageEvidently vs Langfuse
Our take
Pick Evidently if you're on a mL / LLM team who will run Evidently locally at $0 — not Arize first unless they want hosted Signal at $50. Pick Langfuse if you're on a team shipping LLM apps who need traces and a cost tile, not another chat UI. Skip Langfuse if you're people who only want a gateway (LiteLLM) or a framework (LangChain) without an observability SKU.
Best for
Evidently One Apache dashboard for LLM and classic ML quality
Langfuse Debug and cost-track generations
Free plan
Evidently $0 · local UI (evidently ui). You bring compute and judge-model keys
Langfuse $0 · for the MIT core. ee/ is not the community license
Lowest paid
Evidently Not published by the vendor
Langfuse Enterprise $2/mo
Next step up
Evidently
Langfuse Core $29/mo
Runs where
Evidently Hosted
Langfuse Local or hosted
Watch out
Evidently $0 is the library, not judge tokens
Langfuse Hobby is two users and 30-day retention
Last checked
Evidently 2026-10-27 · evidentlyai.com
Langfuse 2026-10-19 · langfuse.com/pricing
Which one, then?
Pick Langfuse if
teams shipping LLM apps who need traces and a cost tile, not another chat UI.
Read the Langfuse page