Braintrust review

Braintrust ranks third because its evaluation workflow is the most complete here. The docs organize the product around instrumenting, observing, annotating, evaluating and deploying, with evaluators, playgrounds, experiments, remote evals and online scoring of production traffic. Every plan includes unlimited users, projects, datasets and experiments, so a whole team can join for free on Starter, which includes 1 GB of processed data, 10k scores and 14-day retention. Pro costs $249 a month and adds $100 of model credits, 5 GB of processed data, 50k scores, 30-day retention, custom charts, environments and RBAC. Overage on Pro is $3 per GB and $1.50 per 1,000 scores. The price of Pro is what holds its value score back: a small team that only needs tracing pays less with Langfuse or Opik. Startups should check the 6 to 12 month free Pro offer first.

Who it is for

AI product teams that run evals before every release

Price

Free Starter plan with unlimited users; Pro $249 a month.

Pro For AI native teams $249 / month
Quoted from the vendor pricing page on November 12, 2026.

Key features

• Unlimited users, projects, datasets, playgrounds and experiments on every plan
• Online scoring, evaluators, remote evals and human review
• Logs, topics, dashboards and alerts for production traffic
• Loop agent for working with traces and evals
• Enterprise option for on-prem or hosted deployment

Strengths and weaknesses

• Strength: Starter is free with unlimited users, 1 GB of processed data and 10k scores
• Strength: Pro includes $100 of model credits a month
• Strength: Qualifying startups can get 6 to 12 months of Pro free
• Weakness: Pro costs $249 a month, the highest flat entry price on this list
• Weakness: Starter keeps data for only 14 days
• Weakness: SAML SSO and a BAA require Enterprise

Key facts

• Free plan: Starter, 1 GB processed data, 10k scores, 14-day retention
• Pro: $249 a month, 5 GB processed data, 50k scores
• Overage: $3 per GB and $1.50 per 1,000 scores on Pro
• Users: Unlimited on all plans

Where it ranks

Braintrust is No. 4 in our Best LLM Observability Tools verdict.