Per-token billing for text models and per-image/second for media models, with all models priced 20% below official provider rates. Free trial with test credits, no credit card required. Credits roll over indefinitely.
Key features
Hierarchical traces capture every LLM call, tool invocation, and retrieval step
LLM-as-a-judge, heuristic functions, or human review evaluations
Prompt management with one-click deployments and rollbacks
Playground to test prompts on real production inputs and compare models
Experiments with test cases and side-by-side comparison
Human annotation and collaborative human-in-the-loop workflows
Cost and latency monitoring with dashboards and alerts
REST APIs and Query SDK for data access
Langfuse Assistant to automate the AI engineering loop
OpenAI-compatible API
Unified billing and credentials
Real-time usage analytics
Budget alerts and cost control
Model comparison tools
Playground for testing
Enterprise-grade security
99.9% service uptime
Sub-400ms average latency
What makes it different
MIT licensed open source platform with no data lock-in
Enterprise scale architecture handling billions of monthly events
Works with any language and framework with no framework lock-in
Async by default so tracing never blocks your application