Open-source LLM engineering platform for tracing, prompt management and evaluation of AI apps and agents.
What it does
Langfuse is an open-source AI engineering platform (now part of ClickHouse) for tracing, evaluating and improving LLM applications. Teams gain observability into cost, latency and quality, plus prompt management and evaluation tooling.
Core features
LLM observability and tracing
Prompt management
Evaluation and scoring
Metrics and dashboards
Open-source and self-hostable
Best for
→Trace and debug LLM apps and agents
→Manage and version prompts
→Evaluate output quality, cost and latency
Pricing
Hobby
$0
Core
$29/mo
Pro
$199/mo
Enterprise
$2499/mo
Toolspool rankingby global site rank
Reviews
Big-picture takes: what it's for and whether it delivers. High-engagement YouTube videos — not sponsored.