Langfuse
Open-source LLM engineering platform
Our Take
Langfuse was the strongest open-source option in the observability space, and in January 2026 it was acquired by ClickHouse. The core remains open source. If you want self-hosted tracing without vendor lock-in, start here. The cloud offering is generous on the free tier. Main gap is advanced alerting — you'll outgrow it if you need complex monitors.
Pros
- + Open source, self-hostable
- + Generous free tier
- + Strong LangChain/LlamaIndex integration
- + Active development and community
- + Built-in prompt management
Cons
- - Alerting is basic
- - Smaller community than LangSmith
- - Self-hosting requires PostgreSQL + ClickHouse
Details
- Pricing Model
- freemium
- Starting Price
- $0
- Self-Hosted
- Yes
- Cloud Hosted
- Yes
- Founded
- 2022
- Repository
- GitHub →
Best For
- • LLM tracing and debugging
- • Prompt management
- • Cost tracking
- • Self-hosted observability
Integrations
OpenAI LangChain LlamaIndex Vercel AI SDK Anthropic LiteLLM
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