Is MLflow free for LLM observability & evals?

Yes, Self-hosted (open source) costs nothing.

How much does MLflow cost for LLM observability & evals?

Free and open source under Apache 2.0; running the tracking server is your only cost. At list prices: : $0/month (Self-hosted (open source)); : $0/month (Self-hosted (open source)); : $0/month (Self-hosted (open source)).

MLflow pricing

How MLflow charges, what to know before you commit, and what you'd pay at your usage — next to what the alternatives would cost for the same thing.

How it charges

Checked 2026-10-03 on mlflow.org ↗ · USD, list prices

In short

Free and open source under Apache 2.0; running the tracking server is your only cost.

Free plan: Yes
Side project: $0/mo Self-hosted (open source)
Growing: $0/mo Self-hosted (open source)
Scaling: $0/mo Self-hosted (open source)

What the model leaves out

Free and open source; running the tracking server is your cost. Managed versions from Databricks and cloud providers are priced by those vendors and not modeled.