Braintrust

What is Braintrust?

Braintrust is an observability and evaluation platform for teams that ship LLM applications and agents. It records traces of prompts, responses and tool calls, then scores the outputs with LLM-as-a-judge scorers, autoevals, custom code or human reviewers. Teams use those scores to compare experiments, test prompts in playgrounds and spot quality drops before a change goes live. A built-in assistant called Loop can kick off evaluations, produce test cases and refine prompts. Custom dashboards, environments and dataset snapshots help with production monitoring, and traces can be exported to your own S3 bucket. The Starter plan is free with no credit card, Pro costs $249 per month, and Enterprise is custom priced with BYOC or self-hosted deployment. Usage beyond the included processed data, scores and model credits is billed on demand.

Use cases

• Trace LLM prompts and tool calls
• Score outputs with LLM or human judges
• Compare prompt and model experiments
• Build evaluation datasets from traces
• Monitor AI quality in production
• Export traces to S3 for analysis

Who it's for

• AI engineers
• Product teams
• Startups
• Enterprise AI teams

Why use Braintrust

• Free Starter plan with unlimited users, projects and datasets lets a whole team try tracing and evals without a credit card.
• Scores from judges, code and humans live in one place, so quality checks do not depend on a single method.
• Pro lowers the per-GB and per-score rates and adds dashboards, environments and priority support.
• Enterprise adds custom retention, audit logging and on-prem style deployment for privacy-sensitive data.
• Qualifying early-stage startups can apply for 6 to 12 months of free Pro access.

Braintrust features

• Tracing for prompts, responses and tool calls
• Scores from LLM-as-a-judge, autoevals and code scorers
• Human review scores for manual annotation
• Loop agent that runs evals and iterates on prompts
• Playgrounds and experiments with unlimited projects and datasets
• Custom charts, dashboards and environments on Pro
• Built-in models usable with monthly model credits
• Automatic S3 export of traces
• SOC 2 Type II, MFA and role-based access control
• BYOC and self-hosted deployment on Enterprise

Braintrust integrations

• Slack

How to get started with Braintrust

1. Create a project and instrument your application so traces flow into Braintrust.
2. Define scorers using LLM judges, autoevals, custom code or human review.
3. Run experiments in playgrounds or on datasets and compare scores between versions.
4. Review production traces and dashboards, then turn problem cases into new test data.
5. Watch usage and spend, and move to Pro or Enterprise as volume and compliance needs grow.

Braintrust limitations

• Starter keeps data for 14 days and Pro for 30 days before storage charges apply
• Starter includes 1 GB of processed data and 10k scores per month
• Custom dashboards and environments are not available on Starter
• SAML or OIDC SSO, audit logging and self-hosting need Enterprise

Braintrust pricing

Yes, Braintrust has a free plan. Paid plans start at $249 per month, according to the official pricing page on 24 Oct 2026.

Braintrust plans

• Starter

  $0 /month

  • $10 model credits
  • 1 GB processed data
  • 10k scores
  • 14-day retention
  • Unlimited users, projects and datasets

• Pro

  $249 /month

  • $100 model credits
  • 5 GB processed data
  • 50k scores
  • 30-day retention
  • Custom charts, environments and priority support

• Enterprise

  Custom

  • Custom usage limits
  • Custom data retention and export
  • SAML or OIDC SSO and RBAC
  • BYOC and self-hosted deployment
  • Premium support

Plans as listed on the official pricing page on 24 Oct 2026. Prices can change and may vary by country or exclude tax. Check the official pricing page.

Braintrust alternatives

The main Braintrust alternatives listed on Debuly are Langfuse, Promptfoo, Helicone, Opik, Confident AI and Arize Phoenix. The table compares pricing and platforms; order is A–Z.

1. 

   Arize Phoenix

   Open-source tool for tracing, evaluating and experimenting on LLM apps and agents, free to self-host or run locally.

   Developer platformsAutomation and agents
   Open sourceVisit Arize Phoenix (official site)
2. 

   Confident AI

   Evaluation and observability platform for LLM apps, built on the DeepEval framework, with tracing, datasets and regression tests.

   Developer platformsProductivity
   FreemiumVisit Confident AI (official site)
3. 

   Helicone

   Open-source LLM observability and AI gateway that logs requests, tracks cost and latency, and routes to 100+ models through one API.

   Developer platformsCoding
   FreemiumVisit Helicone (official site)
4. 

   Langfuse

   Open-source LLM observability and evaluation platform for tracing agents, managing prompts and scoring outputs.

   Developer platformsAutomation and agentsCoding
   FreemiumVisit Langfuse (official site)
5. 

   Opik

   Comet's open-source platform for tracing, evaluating and monitoring LLM applications and agents, self-hosted or in the cloud.

   Developer platformsAutomation and agentsCoding
   FreemiumVisit Opik (official site)
6. 

   Promptfoo

   Open-source LLM evaluation and red-teaming tool that finds prompt injections, jailbreaks and data leaks in AI apps and agents.

   Developer platformsCodingAutomation and agents
   Open sourceVisit Promptfoo (official site)

Braintrust FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

Image credits

• Logo: from braintrust.dev · fetched 23 Oct 2026 · Vendor trademark, used only to identify the product; removed on request
• Cover: none collected yet, so a generated tile is shown.

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