Open-source AI infrastructure
Compare Everstack and Braintrust on evaluation depth, which tier unlocks self-hosting, processed-data pricing, and whether evals connect to the runtime that produce…
Their scorer authoring, experiment workflow and review tooling are more mature than ours, and if evaluation is the centre of your work that is the right reason to pick them. This page says so more than once, because a comparison that claims to win everywhere is not worth reading.
Braintrust's pricing describes on-prem or hosted deployment for high volume or privacy-sensitive data as a custom Enterprise arrangement, not available on Starter or Pro. Starter is $0 with $10 in credits, 1 GB of processed data and 10,000 scores; Pro is $249 per month with 5 GB and 50,000 scores. Figures August 2026.
Braintrust is not in the request path, so evaluation data is something you instrument and send. Everstack scores runs that already went through the gateway or agent runtime, which removes the most common reason eval coverage stays partial: nobody instrumented the service that mattered.