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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

arize-phoenix-v19.4.02026-07-22PythonElastic-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
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