Complete observability for modern LLM applications
Pydantic Logfire monitors your complete AI application, including LLM calls, agent reasoning, API latency, database queries, vector searches, and everything in between. Built on OpenTelemetry with first-class support for AI & general observability and native integrations for AI frameworks.
The Full Picture
Real AI applications are complex systems
Problems in production AI applications rarely come from the LLM alone. They hide in the seams: slow database queries that delay context retrieval, API timeouts during agent tool calls, inefficient vector searches, or memory leaks in background tasks. You need visibility across your entire application stack, not just the LLM calls.
What Logfire shows you
- ✓Complete application traces from request to response
- ✓Database queries, API calls, and business logic
- ✓Dashboards and application metrics
- ✓One platform with first-class AI & general observability for your entire application
What others show you
- ✗LLM request/response only
- ✗Missing context on performance bottlenecks
- ✗No visibility into retrieval quality
- ✗Separate tools for app monitoring
Example
Monitor RAG pipelines end-to-end
See every stage of your retrieval-augmented generation workflow: from vector search to context building to final generation. Identify bottlenecks and optimize performance.
Why Logfire for AI Observability?
OpenTelemetry-Native
Built on industry-standard OpenTelemetry. No vendor lock-in, export to any backend, or use our hosted platform.
Complete Application Traces
See your entire application: LLM calls, agent reasoning, database queries, API requests, vector searches, business logic, JS/TS frontend.
Integrated Evaluation Framework
Use Pydantic Evals to continuously evaluate LLM outputs in production. Curate datasets from production traces and catch regressions before users do.
Real-Time Cost Tracking
Track LLM API costs in real-time. Identify expensive prompts, optimize model selection, and set budget alerts. See exactly where your AI spending goes.
Pydantic AI & AI Gateway Integration
Seamlessly integrates with Pydantic AI for monitoring and Pydantic AI Gateway model routing across all major LLM providers.
From Local Dev to Production
See traces in real-time as you code. Catch bugs in development, carry the same observability through to production. No tool switching, no friction.
Integrations
Works with your entire stack
One-line instrumentation for many frameworks, databases, AI providers, event streams, etc. Auto-instrumentation means you get observability without changing your code.
AI & LLM Providers
Web Frameworks
JavaScript
Databases & Data
HTTP Clients
Event Streams
Ready to see your complete AI application?
Start monitoring your LLMs, agents, and entire application stack in minutes. 10 million free spans per month. No credit card required.
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USA and EU data residency available.