Langfuse
Open sourceUpdated recentlyPricing may have changed — not yet verifiedOpen-source LLM engineering platform: traces, evals and cost analytics.
by Langfuse · Primary workflow: Production LLM observability tied to evaluation workflows
scored
No verified editorial score yet. Scores appear only after documented evaluation.
What it is
Langfuse captures LLM application traces, links them to evaluation scores and dashboards covering latency/cost/quality. Self-hostable core (MIT) plus managed cloud makes it popular where data control matters.
Editorial basis: vendor documentation and public information reviewed by our editors; written originally for this catalog. Hands-on testing has not yet been performed. Last editorial update 2026-08-26.
Editorial assessment
- Teams needing self-hosted LLM telemetry
- Cost/latency/quality triangulation
- Wanting opinionated eval authoring UX only
- Zero-infra teams preferring pure SaaS
- MIT self-host option
- Trace-level context for every score
- Ops burden when self-hosting
- Eval features leaner than dedicated eval platforms
Hands-on evidence
Vendor information reviewed; hands-on testing not yet completed.Vendor information reviewed; hands-on testing not yet completed.
When we test this tool ourselves, this section will document the test date, exact scenario, setup experience, example output, integration result and discovered limitations — with reproducibility notes so you can replicate it.
Read our evidence policy →Pricing
Cloud
Usage-based tiers per vendor page
See vendorUnverifiedOSS/self-host
FreeUnverified
Pricing reflects publicly listed information at research time and is marked unverified until an editor re-checks the vendor’s pricing page. Always confirm on the official site.
Integrations & compatibility
- Deployment
- Docker, Self-hosted, Cloud
- Platforms
- Web, Linux
- Languages / SDKs
- Python, TypeScript, JavaScript
- API available
- Yes
- Learning curve
- Moderate
- Documentation quality
- GOOD
- Team fit
- Small team, Mid-size, Enterprise
- Support
- See vendor
Security, privacy & AI transparency
Aggregates custom/LLM-judge scores onto traces; judge behavior depends on your prompts.
Vendor response
Vendors can respond to listings and reviews through the vendor portal. Responses are moderated and labeled. No response has been received for this listing yet.