Langfuse
Open source platform that traces, evaluates and monitors LLM apps and agents, self-hosted or in the cloud.
How the 8.0 was reached
- Quality of output8/10
GitHub has 35,205 stars and active pushes; vendor cites Fortune 50 usage. github.com
- Ease of use8/10
Free tier of 50k observations and a step-by-step guide to a first trace with OpenAI, LangChain or SDKs. langfuse.com
- Pricing value8/10
Free Hobby plan and self-hosting; paid from $29 a month with published overage rates. langfuse.com
- API and integration quality8/10
SDKs and integrations with OpenAI and LangChain; self-hosting guides for Docker, Kubernetes and Terraform. langfuse.com
- Solves the problem it claims to solve8/10
Hierarchical tracing with filters is documented, and 35K stars show adoption for open source LLM observability. github.com
8.0/10 is the mean of the 5 criteria that apply. Scored on the five-criteria rubric v1, 29 September 2026. How scoring works
Pricing
- 50k observations per month on the free tier
- 100k units per month included
- 100k units per month included
- Extra usage at $8 per 100k units, with volume discounts
Key Features
- Hierarchical traces for LLM calls, tool invocations and retrieval steps
- Filters by user, session, cost, latency and custom metadata
- Prompt management and evaluation metrics
- SDKs and integrations for OpenAI and LangChain
- Self-hosting guides for Docker Compose, Kubernetes (Helm) and Terraform on AWS, GCP and Azure
Pros & Cons
Pros
- Free Hobby plan and self-hosting option
- About 35.2k GitHub stars point to wide adoption
- Langfuse says 21 of the Fortune 50 use it
- Published overage rates make costs easy to predict
Cons
- Enterprise plan at $2499 a month is a big step up from Pro
- Joined ClickHouse, which may shift its direction
- Usage-based overage can add up at high volume
- Best suited to teams that already instrument their code
A strong default for teams that want LLM tracing and evals with an open source, self-hostable base. Very small projects may not need the full platform, and buyers on a fixed budget should model overage costs.
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