Open source llm-observability projects
Every project in the registry tagged llm-observability, ranked by real GitHub adoption.
Open source LLM engineering platform for AI-powered applications
Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready d
AI Agent Engineering Platform built on an Open Source TypeScript AI Agent Framework
Ultra-fast AI gateway with enterprise-grade reliability
Build reliable AI apps with comprehensive observability
Full observability for AI agents in production
Powerful observability made simple for developers
AI-powered platform for engineering LLM products
Open-source, end-to-end platform for evaluating, observing, and improving LLM and AI agent applications. Tracing · Evals · Simulations · Datasets · Gateway · Gu
Trace-native CI/CD for AI agents — production failures become regression tests that block the PR. Auto-detect, cluster, freeze into hermetic cases, replay in CI
LLM observability: cost, latency, and traces in one place
Trace, evaluate, and protect every LLM call in one SDK
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Frequently asked questions
How many open source llm-observability projects are there?
This registry tracks 12 projects tagged llm-observability, with 97,617 GitHub stars between them. The most-adopted is Langfuse at 34,729 stars.
Are these llm-observability projects free to use?
Yes — 11 of the 12 carry an explicit open-source licence across 3 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which llm-observability project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these llm-observability projects still maintained?
12 of the 12 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.