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Pydantic Logfire vs Langfuse
Quick verdict
Pydantic Logfire and Langfuse are closely matched on licensing, self-hosting and OpenTelemetry support — the decision comes down to pricing and framework integrations below.
Side-by-side comparison from the Agent Observability Index: licensing, self-hosting, pricing model and integrations — no vendor copy, primary sources linked.
| Pydantic Logfire | Langfuse | |
|---|---|---|
| One-liner | OpenTelemetry-based observability service from the Pydantic team with first-class PydanticAI and Python ecosystem integration. | Open-source (MIT) LLM engineering platform combining tracing, prompt management, evals and datasets, widely used as the default self-hosted observability stack. |
| Category | Observability & Tracing | Observability & Tracing |
| OpenTelemetry-native | Yes | Yes |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Pricing model | freemium | freemium |
| Pricing notes | Free monthly span allowance, then usage-based per-span pricing; SDK is OSS | Free Hobby tier (50k units/mo); Core $29/mo, Pro $199/mo, unlimited users on paid tiers; MIT core fully self-hostable |
| Frameworks | pydantic-ai, openai-sdk, anthropic, opentelemetry, fastapi | langchain, openai-sdk, llamaindex, litellm, opentelemetry, vercel-ai, haystack |
| GitHub stars | 4.3k | 29k |
| Maturity (GitHub signal) | 95/100 (Mature) | 90/100 (Mature) |
| Funding / ownership | Pydantic raised $12.5M Series A (Sequoia, 2023) | YC W23; $4M seed (Lightspeed, La Famiglia) |
How to choose
- Both link to primary pricing sources below — verify current tiers before committing; this market shifts monthly.
Sources: Pydantic Logfire · Langfuse
Frequently asked questions
Is Pydantic Logfire or Langfuse open source?
Pydantic Logfire: Yes. Langfuse: Yes.
Can Pydantic Logfire and Langfuse be self-hosted?
Pydantic Logfire: Yes. Langfuse: Yes.
Pydantic Logfire vs Langfuse: which should I choose?
Pydantic Logfire and Langfuse are closely matched on licensing, self-hosting and OpenTelemetry support — the decision comes down to pricing and framework integrations below.