What Logfire does
Pydantic Logfire is an observability platform for AI applications built on OpenTelemetry, tracing the whole application rather than only LLM calls. It is for teams building LLM apps, agents, RAG pipelines and backend services who want model calls, tool calls, API requests and database queries on one timeline. Named features include distributed tracing, FusionFire for querying telemetry with Postgres-flavoured SQL, evals combining programmatic checks, LLM judges and human review, SDKs for Python, JavaScript/TypeScript and Rust, an MCP server, PII scrubbing and an EU data region. Pricing is freemium: the Personal plan includes 10 million spans, logs and metrics per month free, Team starts at $49/month, Growth at $249/month, and Enterprise is custom.
How Logfire compares with its closest alternatives
4 of the 5 closest alternatives have a free plan, as Logfire does. Only HyperProbe lists a starting price, $99 a month. 4 of the 5 offer an API, as Logfire does. Logfire offers a web app. Of the alternatives, 4 offer a web app. Logfire was founded in 2024; the alternatives were founded between 2023 and 2025, 1 of them earlier. The alternatives with a known headquarters are in the United States.