Open source alternatives to Pydantic Logfire

By GitHub stars it is SigNoz, with 32,625 stars and a commit on 13 Nov. Choose SigNoz when you need LLM traces next to infrastructure metrics and logs in a tool you can self-host for free. Next come AgentOps (5,954 stars) and Laminar (3,488 stars).

Yes. The code of all 3 is public under MIT or Apache 2.0, so you can use them with no licence fee. Running one yourself costs the server and your time to look after it, and some makers also sell a hosted plan.

Start from the job you use Pydantic Logfire for. Choose AgentOps when your traces are mostly agent runs and their token costs, and you want a tracer you can self-host under MIT. Choose Laminar when you want open-source tracing built around agent runs that you can self-host under Apache 2.0.

2 of the 3: SigNoz and Laminar. Each tool's page says what it needs to run.

2 of the 3 we track had a commit in the last 30 days, among them SigNoz and Laminar. The quietest is AgentOps, last changed on 25 Jun. A recent commit shows the project is kept up, not that it will stay that way.

MIT (2), Apache 2.0 (1). MIT, BSD and Apache let you change and reuse the code freely.

The hosting. Pydantic Logfire's maker runs the servers for you; with an open source tool the updates, backups, security fixes and support are yours, unless you take the maker's hosted plan. Features differ too, so check what each one imports and exports before you move your data.