Pydantic Logfire
Observability for AI apps and agents: traces LLM calls, tool calls and costs next to the rest of your app's telemetry.
Is Pydantic Logfire free?
Yes, Pydantic Logfire has a free plan. What you get: 10M telemetry records per month, 3 projects, 1 seat, 30-day retention. Free limits: 10M telemetry records per month; 3 projects; 1 seat and 2 read-only guests. Watch out: ingestion pauses at 10 million records a month. Paid plans start at $49/month (Team). Verified on pydantic.dev.
Free plan at a glance
- Includes
- 10M telemetry records per month
- 3 projects
- 1 seat and 2 read-only guests
- 30-day data retention
- Query API: up to 500 requests per day
A record is one span, log or metric. The Personal plan is hard-capped at no cost: ingestion stops at the cap instead of billing you, and extra records can't be bought on this plan.
- Duration
- Free forever
How to get it free
Free account · GitHub, Google or email- Sign up with GitHub, Google or email and choose a data region
- Install the SDK with uv add logfire
- Call logfire.configure() and send your first trace
Good to know
- Ingestion pauses at 10 million records a month
- Extra records can't be bought on the free plan
- 1 seat and 3 projects, with 30-day retention
pydantic.dev, Checked Source
Overview
Pydantic Logfire traces whole AI app runs, from LLM and tool calls to database queries and your own code, and stores them as data you can query with SQL. It's built on OpenTelemetry, with SDKs for Python, TypeScript and Rust, and comes from the team behind Pydantic.
Free vs paid
| Free | Team | |
|---|---|---|
| Price | $0 | $49/mo |
| Includes |
| Plan details |
Key features
- Traces LLM calls, tool calls, database queries and API requests in one view
- Built on OpenTelemetry, with SDKs for Python, TypeScript and Rust
- SQL queries over traces, logs and metrics, with dashboards and alerts
- Cost tracking for each model and agent
- MCP server so coding agents such as Claude Code can query production data
- AI Gateway: one endpoint for many models, with spend caps
Best for
- People
- Solo developers and side projects building with AI, Python and TypeScript developers tracing LLM apps and agents, Teams that want AI traces next to normal app telemetry
Limitations
- Ingestion pauses once you reach 10 million records in a month
- 1 seat, 2 read-only guests and 3 projects, with 30-day retention
- The pricing page lists AI output evaluations and human review under the Team plan
Screenshot
FAQ
- Is Pydantic Logfire free?
- Yes. Pydantic Logfire has a free plan: 10M telemetry records per month, 3 projects, 1 seat, 30-day retention. We last checked pydantic.dev's pricing page on 2026-10-24.
- What does the Pydantic Logfire free plan include?
- The Pydantic Logfire free plan includes: 10M telemetry records per month; 3 projects; 1 seat and 2 read-only guests. Source: https://pydantic.dev/pricing (checked 2026-10-24).
- How do I get Pydantic Logfire for free?
- Steps: Sign up with GitHub, Google or email and choose a data region; Install the SDK with uv add logfire; Call logfire.configure() and send your first trace. Sign-up options: GitHub, Google or email. Start at https://pydantic.dev/signup?pydev_site_handoff=1 (checked 2026-10-24).
- What's the catch with Pydantic Logfire's free plan?
- Ingestion pauses at 10 million records a month. Extra records can't be bought on the free plan. Checked 2026-10-24.
- How much does Pydantic Logfire cost after the free plan?
- The cheapest paid plan is the Team plan, at $49 a month, billed monthly. We checked pydantic.dev's pricing page on 2026-10-24.Source: pydantic.dev/pricing
- What are free alternatives to Pydantic Logfire?
- Langfuse, Braintrust and Arize Phoenix all have free plans. We checked their free offers on 2026-10-25.
- What happens if I go over the free allowance?
- Logfire sends emails and in-app alerts. On Personal it eventually stops ingesting new data, and you can't pay for extra records ad hoc, so you'd need to upgrade.Source: pydantic.dev/pricing
- Can I use the free Personal plan in production?
- Yes, as long as you accept that ingestion pauses at the 10 million records a month cap. That way you can't owe anything on Personal.Source: pydantic.dev/pricing
- Does Pydantic offer discounts for academics or start-ups?
- Pydantic offers financial support for not-for-profits, academics, community groups and pre-funding start-ups. You apply for financial assistance with Logfire on the pricing page.Source: pydantic.dev/pricing
Free alternatives
Langfuse
Open-source LLM observability and evals.
Free forever, Free Hobby plan; open source self-host
Braintrust
Evals and observability platform for AI products.
Free forever, Free plan for evals and logging
Arize Phoenix
Open-source LLM tracing and evaluation.
Free forever, Open-source and free cloud tier
Grafana Cloud
Observability platform with AI assistant.
Free forever
Agenta
Open-source LLMOps platform for prompts and evals.
Free forever
Sources
- Free offer
- Verified on pydantic.dev/pricing
…Personal plan is designed for you to test Logfire or use it with side…
- Page content
Checked against
Added by our team. We check that a free option exists and record the date; signing up is between you and Pydantic Logfire, so read their privacy policy and terms first.
Is this your tool? Claim it · Promote it
