Open Source
LLM Engineering Platform
Traces, evals, prompt management and metrics to debug and improve your LLM application.
Teams building complex LLM apps rely on Langfuse
Tools for the full development workflow
All Langfuse features are tightly integrated with Langfuse Tracing.
Tracing
Detailed production traces to debug LLM applications faster.
Prompt Management
Version and deploy prompts collaboratively and retrieve them with low latency.
Playground
Test different prompts and models right in the Langfuse UI.
Evaluation
Collect user feedback, annotate in Langfuse and and run evalutation functions in Langfuse.
Datasets
Derive datasets from production data to fine-tune models and test your LLM application.
Metrics
Track cost, latency, and quality.
Works with any LLM app and model
SDKs for Python & JS/TS and native integrations for popular libraries. Missing an integration? Let us know!
Proudly Open Source
Langfuse is committed to open source. You can also run it locally or self-hosted.
Changelog
Trace Timeline View by Marlies
Update Indicator by Marc
New Docs and Cookbook: Monitoring LLM Security by Marc
Annotation Drawer by Marlies
New Cookbook: Tracing OpenAI Assistants API by Marc
Dark Mode by Richard
Haystack Integration by Lydia
Mirascope integration by Marc
Prompt Version Insights by Marlies
Sticky headings on tables by Marlies
Playground and evaluations with GPT-4o by Hassieb
Token/cost tracking for GPT-4o models by Marc
Prompt management REST API and deployment labels by Hassieb
SOC 2 Type II certification by Clemens
Model-based evaluations by Max
Datasets v2 by Marc
Decorator-based integration for Python by Marc
LLM playground by Hassieb
PostHog integration by Marc
OpenAI SDK integration for JS/TS SDK by Hassieb
Read the full changelog ...
Enterprise Security
Langfuse is built with security in mind. Langfuse Cloud is SOC 2 Type II and ISO 27001 certified and GDPR compliant.
Simple pricing for projects of all sizes
Get started on the Hobby plan for free. No credit card required.
Hobby
Free
- No credit card required
- All platform features
- 50k observations / month included
- Community support (Discord & GitHub)
Pro
$59
USD
Billed monthly
- 100k observations / month included, additional: $10 / 100k observations
- Unlimited data access
- Unlimited users
- Dedicated support
Team
Starts at $499
- Unlimited ingestion throughput
- Support SLAs
- SSO enforcement and custom roles
- Additional security and compliance features