Open Source alternative to Datadog LLM Observability in 2026
We compare 1 self-hostable tool you can deploy on your own server in minutes, with license, tech stack and a ready-to-copy docker-compose.
Quick comparison
Sorted by featured first, then GitHub stars as a tiebreaker — the same rule we use across the whole site.
| Tool | License | Minimum RAM | Docker | GitHub |
|---|---|---|---|---|
| Langfuse Lightest optionMost popular on GitHub | MIT | ~2GB | ✅ | ★ ~9,000 |
Detailed profile of each alternative
Alternative to Datadog LLM Observability
Observability and evals for LLM apps, self-hostable.
How much does Datadog LLM Observability cost, and how much can you save?
Datadog LLM Observability charges a recurring monthly fee. Self-hosting the alternative, you only pay for the server — usually a few dollars a month.
Calculate your exact savings in the SaaS Audit →Already know which one you want?
Add Langfuse to the Stack Builder and generate a ready-to-deploy docker-compose.yml, alone or alongside the rest of your stack.
Build my stackFrequently asked questions
Do I need Docker to self-host a Datadog LLM Observability alternative?
Yes: the only alternative on this list has a ready-to-copy docker-compose.yml. You just need Docker installed on your server.
How much RAM do I need at minimum?
The lightest option on this list is Langfuse, which runs on as little as 2GB of RAM — enough for a cheap VPS.
Are they all 100% free, or are there paid features like on Datadog LLM Observability?
No: it's Open-Core. The core is free and self-hostable, but some advanced feature may stay paid — we call it out on its page.