Braintrust
Evaluation, prompt playground, and observability for LLM apps in production.
Braintrust is an evaluation, prompt playground, and observability for LLM apps in production.
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Concepts you should know
- Eval
A reproducible test that measures how an LLM or LLM application performs on a specific task. Golden test sets, rubric grading, A/B comparisons. The closest thing to unit tests for prompts.
- LLM as judge
Using an LLM (often a stronger one than the one being tested) to grade outputs against a rubric. Replaces or supplements human grading for evals at scale. Accuracy of the judge is itself a metric you have to measure.
Frequently asked questions
- What is Braintrust?
- Braintrust is an evaluation, prompt playground, and observability for LLM apps in production.
- Is Braintrust free?
- Braintrust offers a free tier and paid plans with higher limits or premium features.
- What platforms does Braintrust support?
- Braintrust runs on web.
- What category does Braintrust belong to?
- Braintrust is in the AI Web Apps category — Web apps with AI baked in — built for everything from journaling to research. Submitter-shipped products live here.