Langfuse
Open-source LLM observability platform for tracing, evaluating, prompt management and debugging language-model applications.
Self-hostable open source (MIT); Hobby free (50k units/month, 2 users, 30 days of data access); Core $29/month (100k units); Pro $199/month; Enterprise $2,499/month; a Teams Add-on at $300/month adds SSO, RBAC and dedicated support to Pro. Overage is graduated from $8.00 per 100k units to $6.00 above 50M.
What it does
- Evaluation and observability
How it compares
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Helicone
Helicone and Langfuse are top open-source tools that help developers monitor, analyze, and optimize their LLM-powered applications.
Official documentation · 19 Sep 2026 -
LangSmith
This guide outlines the key differences between Langfuse and LangSmith ... Choose LangSmith if you are an all-in LangChain/LangGraph shop that wants a managed SaaS ... Is Langfuse the best LangSmith alternative? Yes, if you want an independent open-source platform
Official documentation · 19 Sep 2026 -
Arize AX
For teams replacing Langfuse because agent complexity, unit costs, or enterprise requirements have grown past what the platform handles, Arize should be the first comparison.
Official documentation · 20 Sep 2026
Sources
- Pricing
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Official documentation · 31 Aug 2026
Pricing page lists Hobby (free, 50k units/month), Core ($29/month, 100k units), Pro ($199/month, 3 years data access), Enterprise ($2,499/month).
- Sold within
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"Get started on the Hobby plan for free. No credit card required." Paid Core ($29 per month) and Pro ($199) are self-serve; Enterprise ($2499) routes to "Talk to sales".
Also from Langfuse
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Langfuse Assistant Application
In-product AI assistant for exploring Langfuse project data (traces, observations, metrics) and taking approved actions inside Langfuse.
Open Langfuse in the directory
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