Open source alternatives to Openlayer

By GitHub stars it is Langfuse, with 37,399 stars and a commit on 13 Nov. Choose Langfuse when your team needs traces, prompt versions and evaluations in one open-source tool rather than a governance suite. Next come Helicone (6,280 stars) and Latitude (4,753 stars).

Yes. The code of all 4 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 Openlayer for. Choose Future AGI when you want tracing, evaluations and guardrails for production agents that you can self-host under Apache 2.0. Choose Latitude when your main need is catching and grouping agent failures, from open-source code you can inspect.

3 of the 4: Langfuse, Helicone and Latitude. Each tool's page says what it needs to run.

All 4 we track had a commit in the last 30 days, among them Langfuse, Helicone, Latitude and Future AGI. A recent commit shows the project is kept up, not that it will stay that way.

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

The hosting. Openlayer'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.