Dues: sliding scale starting at $5/month. All members receive $15/month credit for chat and API. Additional credits available for purchase; credits never expire and carry over month to month.
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
Web search built into chat
File uploads and document support
OpenAI-compatible developer API
Personal API keys
Encrypted enclave privacy option
100% renewable energy option
Member governance participation
Shared monthly credit allowance
Publicly developed models
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
Member-governed cooperative structure where users help decide the direction and choices
Equal membership with sliding-scale pricing based on ability to pay
Choice of AI models by values including privacy and renewable energy
No data lock-in; members own their data and can cancel anytime
Credits never expire and carry over month to month
Inference Cooperative