Pydantic Logfire review

Pydantic Logfire suits teams whose AI features sit inside a larger Python service. The pricing page describes one record-based meter for AI observability, evals, application performance and infrastructure, so LLM traces and normal application spans land in the same place. Every plan includes 10M records a month, and the free Personal plan is hard-capped at $0 with 3 projects, 30-day retention and 1 seat plus 2 read-only guests. Team costs $49 a month with 5 seats, unlimited agent, service and host monitoring, AI output evaluations and human review, then $2 per million records up to your spending cap. Growth at $249 adds unlimited seats and projects and up to 90-day retention. It ranks below the specialist tools because its evaluation features start only on paid plans and are less detailed in its plan list than in Braintrust or LangSmith, but the spending cap makes costs easy to predict.

Who it is for

Python teams that want AI and app monitoring in one tool

Price

Free Personal plan with 10M records; Team $49 a month with 5 seats.

Team $49/mo For small teams shipping their first production workloads.
Quoted from the vendor pricing page on November 12, 2026.

Key features

• One meter for AI observability, evals, application performance and infrastructure
• 10M telemetry records a month included on every plan
• AI output evaluations and human review from the Team plan
• Monitoring for agents, services and hosts
• Cloud, dedicated or self-hosted deployment on Enterprise

Strengths and weaknesses

• Strength: Personal plan is free with 10M records a month, hard-capped at $0
• Strength: Usage is $2 per million records after the allowance, up to a spending cap
• Strength: Growth plan has unlimited seats, guests and projects
• Weakness: Evals and human review are not on the free Personal plan
• Weakness: Team includes 5 seats and charges $25 per extra seat
• Weakness: Self-hosting requires Enterprise

Key facts

• Free plan: Personal, 10M records a month, 3 projects, 30-day retention
• Team: $49 a month, 5 seats, 10M records included
• Usage: $2 per million records
• Growth: $249 a month, unlimited seats, up to 90-day retention

Where it ranks

Pydantic Logfire is No. 8 in our Best LLM Observability Tools verdict.