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Tag #observability

Arize Phoenix

Arize Phoenix

Arize AI

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

@arizeai/phoenix-mcp@4.3.122026-09-22PythonElastic-2.0
#tracing #eval #observability #opentelemetry
11.6k 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 1+ yearv2025.08.21-12025-08-21TypeScriptApache-2.0
#observability #proxy #logging #typescript
6.2k Open source Free tier Paid
Opik

Opik

Comet

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

v2.2.742026-09-22PythonApache-2.0
#observability #tracing #evaluation #python
22.2k Open source Free tier Paid