Langfuse
An open-source (MIT) agent evaluation and observability platform covering tracing, prompt management, datasets, experiments and evals, with a free self-hostable core. OpenTelemetry-native with 100+ integrations.
- Website
- https://langfuse.com/
- Who it's for
- Engineering teams that want a self-hostable observability and eval platform with full data control.
- Pricing
- Hobby free (50k units/mo, 2 users); Core $29/mo (100k units, unlimited users); Pro $199/mo; Enterprise $2,499/mo. Self-hosted core is free.
- Category
- Agent operations
- Last verified
- 2026-10-22 (current)
- Confidence
- high
Key facts
- Acquired by ClickHouse on 16 January 2026; still actively developed
- MIT licensed, with all core features self-hostable
- OpenTelemetry-native (OTLP ingest) with 100+ integrations
- Built on ClickHouse, which it already used before the acquisition
- Free cloud tier: 50k observations/month
Sources
Every claim above is drawn from these; we do not publish unsourced specifications.
- https://langfuse.com/
- https://langfuse.com/blog/joining-clickhouse
- https://clickhouse.com/blog/clickhouse-acquires-langfuse-open-source-llm-observability
Notes & uncertainties
Acquisition verified from both parties. Licensing and self-hosting are explicitly unchanged; the entire team joined ClickHouse.
Something changed or out of date? Tell us — corrections are how this stays worth reading.