How much does Braintrust cost?

Braintrust uses a freemium model. The Starter tier is free, Pro costs $249 per month, and Enterprise pricing is custom. The free tier allows up to 1,000 events per day, which is sufficient for serious evaluation before committing to a paid plan.

What features are included in the platform?

The platform includes datasets, eval runs, a prompt playground, online monitoring of production traffic, and prompt management. It is designed as a full lifecycle solution, allowing you to write evals, iterate on prompts, and monitor production traffic against your baseline.

Is Braintrust suitable for hobby projects?

It is generally recommended to skip Braintrust for hobby projects because the team-tier cost of $249 per month may be hard to justify. However, the free tier is available for those who want to evaluate the tool without immediate financial commitment.

How does Braintrust handle production monitoring?

Braintrust monitors production traffic and compares it to your eval baseline. This creates a closed loop where you can iterate on prompts and models during development and then track how those changes perform in live production environments.

What makes Braintrust different from other eval tools?

Its differentiator is the whole-lifecycle approach, combining evals and observability in one well-designed product. The UX is noted as genuinely good, which encourages usage, unlike tools that handle only one part of the AI product lifecycle.

Braintrust

Featured✓ Editorially verified

Eval, monitor, and improve AI products end-to-end.

Freemium· Starter: $0 · Pro: $249 · Enterprise: Custom pricingEvaluationPlatform (any LLM)8.9 / 10

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In short

Braintrust unifies AI evals, prompt management, and production monitoring in one platform. It offers a closed-loop workflow for serious teams, with a free tier for initial testing.

Best for

Pick Braintrust for serious AI products where you want eval + observability in one well-designed product.

Skip if

Skip it for hobby projects where the team-tier cost is hard to justify.

Braintrust is a full eval + observability platform for AI products. Datasets, eval runs, a prompt playground, online monitoring of production traffic, and prompt management — all in one product. The UX is genuinely good, which matters because eval tools that nobody enjoys using are eval tools that don't get used.

The positioning is whole-lifecycle: you write eval datasets early, iterate prompts and models against them, ship to production, and the same platform monitors how production traffic compares to your eval baseline. That closed loop is the differentiator from competitors that handle one part of the lifecycle.

Team pricing starts at $249/mo, which is steep for hobby projects but reasonable for a serious AI product team. The free tier (up to 1k events/day) is enough to evaluate seriously before committing.

Editor's take

Braintrust is the eval tool that AI engineers actually enjoy using, which is rare in this category. The closed-loop story between eval datasets and production monitoring is the right architecture and is genuinely well executed.

— The AI Tool Bible editorial team

Pros

✅ Full eval + observability in one tool
✅ Excellent UX
✅ Strong dataset/experiment tracking
✅ Closed loop dev → prod

Cons

⚠️ Team pricing is steep
⚠️ Smaller than LangSmith ecosystem-wise

Use cases

evalsmonitoringprompt management

Frequently asked

How much does Braintrust cost?: Braintrust uses a freemium model. The Starter tier is free, Pro costs $249 per month, and Enterprise pricing is custom. The free tier allows up to 1,000 events per day, which is sufficient for serious evaluation before committing to a paid plan.
What features are included in the platform?: The platform includes datasets, eval runs, a prompt playground, online monitoring of production traffic, and prompt management. It is designed as a full lifecycle solution, allowing you to write evals, iterate on prompts, and monitor production traffic against your baseline.
Is Braintrust suitable for hobby projects?: It is generally recommended to skip Braintrust for hobby projects because the team-tier cost of $249 per month may be hard to justify. However, the free tier is available for those who want to evaluate the tool without immediate financial commitment.
How does Braintrust handle production monitoring?: Braintrust monitors production traffic and compares it to your eval baseline. This creates a closed loop where you can iterate on prompts and models during development and then track how those changes perform in live production environments.
What makes Braintrust different from other eval tools?: Its differentiator is the whole-lifecycle approach, combining evals and observability in one well-designed product. The UX is noted as genuinely good, which encourages usage, unlike tools that handle only one part of the AI product lifecycle.