PricingFree (self-hosted OSS)Free cloud (10k metrics)$29/mo ProCustom Enterprise
Free (self-hosted)Free cloud (50k observations)$59/mo ProCustom Enterprise
SDK Languagespythonjavascripttypescript
Frameworkslangchainllamaindexvercel-aiopenai-agents
Best ForInfrastructure dashboards and alerting — best paired with Prometheus/Loki/Tempo for a fully open-source observability stack
Open-source LLM tracing, prompt management, and evaluation — self-hostable with broad framework support
LimitationsNo native LLM tracing; requires additional tooling (Langfuse, OpenTelemetry) for AI-specific observability; steep learning curve for the full LGTM stack
Smaller ecosystem than Datadog; self-hosted requires Postgres + ClickHouse; evaluation features are still maturing