Braintrust review

Braintrust comes at prompt management from the evaluation side. Prompts are created in the Braintrust UI and referenced from code by slug, and its docs state that changes made in the UI take effect immediately without redeploying the application. You can call invoke() to let Braintrust run the prompt and log inputs, outputs and the version used, or call loadPrompt() and build() to compile the template into parameters for your own model client. Versions can be pinned or assigned to environments, and A/B testing between versions is supported. The reason teams pick it is what surrounds the prompt: unlimited playgrounds, datasets and experiments, scoring, and traces filtered by the prompt version that produced them. The free Starter plan includes unlimited users, $10 of model credits, 1 GB of processed data and 10k scores. The paid jump is steep, though: Pro is $249 a month, and environments, one of the key release controls, sit on that tier.

Who it is for

AI product teams that want every prompt change backed by evals before it reaches users.

Price

Starter free with unlimited users; Pro $249 per month.

Pro For AI native teams $249 / month
Quoted from the vendor pricing page on November 7, 2026.

Key features

• Prompts called by slug, with UI changes taking effect without redeploying
• invoke() to run and log a prompt on Braintrust, or loadPrompt() to run it yourself
• Version pinning and environment assignment
• A/B testing of prompt versions
• Unlimited playgrounds, experiments and datasets on every plan

Strengths and weaknesses

• Strength: Free Starter plan has unlimited users and projects
• Strength: Prompt version is recorded in trace metadata
• Strength: 6 to 12 months of Pro free for qualifying startups
• Weakness: Pro costs $249 a month, the highest paid entry tier here
• Weakness: Starter keeps data for 14 days
• Weakness: Environments and custom charts are Pro features

Key facts

• Starter: $0, $10 model credits, 1 GB processed data, 10k scores
• Pro: $249 per month, 5 GB data, 50k scores, 30-day retention
• Users: Unlimited on all plans
• Compliance: SOC 2 Type II

Where it ranks

Braintrust is No. 4 in our Best AI Prompt Management Tools verdict.