Pydantic Logfire alternatives
10 other observability listed here. Pydantic Logfire is freemium.
Arize Phoenix
AI observability and evaluation you can self-host
Braintrust
Evals, logging and prompt tooling for AI products
Datadog LLM Observability
LLM traces inside Datadog
Helicone
Open-source LLM observability through a proxy or SDK
Langfuse
Open-source LLM observability, evals and prompt management
LangSmith
Tracing, evals and deployment from the LangChain team
OpenLLMetry
OpenTelemetry instrumentation for LLM apps
Opik
Open-source LLM tracing and evals from Comet
PostHog LLM analytics
LLM traces next to product analytics
Weights & Biases Weave
Tracing and evaluation for AI applications