Tracing & Monitoring

See inside a running agent — every LLM call, tool use, latency, and cost — with dashboards and alerts to catch regressions in production.

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Arize Phoenix

Arize Phoenix

Arize AI

Open-source LLM and agent observability — OpenTelemetry tracing and evals you can self-host

arize-phoenix-evals-v3.3.02026-07-23PythonElastic-2.0
#tracing #eval #observability #opentelemetry
10.7k Open source Free tier Paid
Helicone

Helicone

Helicone

Open-source LLM observability via a one-line proxy — logging, caching, and cost tracking

No updates in 6+ monthsv2025.08.21-12025-08-21TypeScriptApache-2.0
#observability #proxy #logging #typescript
6.0k Open source Free tier Paid
Langfuse

Langfuse

Langfuse

Open-source tracing, evaluation, and analytics for LLM and agent applications

v3.224.12026-07-23TypeScriptMIT
#tracing #eval #monitoring #analytics
31.7k Open source Free tier Paid
LangSmith

LangSmith

LangChain

LangChain's hosted platform for tracing, evaluating, and monitoring LLM and agent apps (works with or without LangChain)

SaaS / SDKProprietary
#tracing #eval #monitoring #prompts
Free tier Paid
Opik

Opik

Comet

Comet's open-source platform for tracing, evaluating, and monitoring LLM apps

v2.1.322026-07-17PythonApache-2.0
#observability #tracing #evaluation #python
20.8k Open source Free tier Paid