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Langfuse
Open-source (MIT) LLM engineering platform combining tracing, prompt management, evals and datasets, widely used as the default self-hosted observability stack.
| Category | Observability & Tracing |
| OpenTelemetry-native | Yes — no proprietary-SDK lock-in |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | freemium |
| Pricing notes | Free Hobby tier (50k units/mo); Core $29/mo, Pro $199/mo, unlimited users on paid tiers; MIT core fully self-hostable |
| Framework integrations | langchain, openai-sdk, llamaindex, litellm, opentelemetry, vercel-ai, haystack |
| Funding / ownership | YC W23; $4M seed (Lightspeed, La Famiglia) |
| GitHub stars | 29,001 |
| Maintenance | active (commit 2026-06-12) |
| License (GitHub) | not detected |
| Open issues | 663 |
| Maturity signal | 90/100 (Mature) — computed from public GitHub signals, see methodology |
Pricing/feature source: https://langfuse.com/pricing
Maturity signal is computed from public GitHub data only. How it is calculated.
Frequently asked questions
Is Langfuse open source?
Yes.
Can I self-host Langfuse?
Yes — Langfuse can run in your own infrastructure.
Is Langfuse OpenTelemetry-native?
Yes — Langfuse speaks OpenTelemetry (OTLP) natively, so there is no proprietary-SDK lock-in.
How much does Langfuse cost?
Freemium. Free Hobby tier (50k units/mo); Core $29/mo, Pro $199/mo, unlimited users on paid tiers; MIT core fully self-hostable