Tag #tracing
Arize Phoenix
Arize AI
Open-source LLM and agent observability — OpenTelemetry tracing and evals you can self-host
arize-phoenix-v19.4.02026-07-22PythonElastic-2.0
10.7k Open source Free tier Paid
Langfuse
Langfuse
Open-source tracing, evaluation, and analytics for LLM and agent applications
v3.224.02026-07-22TypeScriptMIT
31.7k Open source Free tier Paid
LangSmith
LangChain
LangChain's hosted platform for tracing, evaluating, and monitoring LLM and agent apps (works with or without LangChain)
SaaS / SDKProprietary
Free tier Paid
Opik
Comet
Comet's open-source platform for tracing, evaluating, and monitoring LLM apps
v2.1.322026-07-17PythonApache-2.0
20.8k Open source Free tier Paid