Tracing & Monitoring
See inside a running agent — every LLM call, tool use, latency, and cost — with dashboards and alerts to catch regressions in production.
Pricing
License
Language
Last updated: Show all
Sort: A–Z
No tools match.
Arize Phoenix
Arize AI
Open-source LLM and agent observability — OpenTelemetry tracing and evals you can self-host
arize-phoenix-v20.8.02026-09-04PythonElastic-2.0
11.4k Open source Free tier Paid
Helicone
Helicone
Open-source LLM observability via a one-line proxy — logging, caching, and cost tracking
No updates in 1+ yearv2025.08.21-12025-08-21TypeScriptApache-2.0
6.1k Open source Free tier Paid
Langfuse
Langfuse
Open-source tracing, evaluation, and analytics for LLM and agent applications
v4.30.02026-09-04TypeScriptMIT
34.3k 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
v2.2.532026-09-07PythonApache-2.0
21.8k Open source Free tier Paid