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Scheduled launch — Sep 15, 2026

Pydantic Logfire is listed on AI Kaptan and will enter the daily launch competition on that day. Community upvotes open on launch day.

Pydantic Logfire
AI Observability
Other

Pydantic Logfire

Pydantic Logfire is an AI observability platform based on OpenTelemetry that monitors whole app stacks, providing distributed tracing, SQL query exploration, evaluations, and cost tracking.

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Rating
0
Reviews
0
Upvotes
about 2 hours ago
Listed
AI observability
OpenTelemetry
distributed tracing
LLM observability
cost tracking
SQL query interface
evaluations
performance monitoring
Tool information
Provider
Pydantic
Platforms
Web
Languages
Python
JavaScript
TypeScript
Rust
Go
Java
API Available
Yes
Added to directory
about 2 hours ago
Last updated
about 2 hours ago
Rating
Not available
Pricing
Other

About Pydantic Logfire

What the tool does and who it's for

Pydantic Logfire is an AI observability platform designed for production-grade AI applications and general observability built on OpenTelemetry. It monitors the entire AI application stack, tracking LLM calls, agent steps, API requests, and database queries. Powered by native SDKs for Python, JavaScript/TypeScript, and Rust, as well as OpenTelemetry support for other languages, it enables distributed tracing, evaluations, and cost tracking. Key features include FusionFire, a columnar engine built for deeply nested traces, and a Postgres-based SQL interface for querying system metrics and telemetry spans to optimize continuous performance.

Key capabilities

Full-stack observability covering LLM calls, agent steps, API requests, and database queries
Built on OpenTelemetry for standardized, flexible telemetry across systems
Native SDKs for Python, JavaScript/TypeScript, and Rust, with OpenTelemetry support for Go and Java
Distributed tracing for end-to-end visibility across microservices and components
Cost tracking and monitoring for AI Language Models (LLMs)
SQL query interface allowing custom Postgres-based SQL execution over every trace span
FusionFire columnar engine built specifically for deeply nested traces and attributes
Evaluation methods designed for continuous performance improvement and AI debugging

Pricing

Other — plans below

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