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Braintrust

Free

The AI observability platform for building quality AI products

FreeFree tier
Type
Open Source
Visit Website GitHub (38 stars)

About Braintrust

Braintrust is an AI observability platform designed to help teams build, monitor, and improve AI products at scale. It provides three core pillars: Observability (real-time tracing of prompts, responses, tool calls, latency, cost, and quality), Evals (define and score outputs using LLMs, code, or human review, with side-by-side comparison of prompts and models), and Discovery (automatic pattern detection via Topics, continuous online scoring, and quality gates to block regressions). Additional features include the Loop agent for autonomous optimization, custom facets for business-specific dimensions, task-specific trace views, one-click trace-to-dataset conversion, an MCP server for IDE integration, and native SDKs for Python, TypeScript, Go, Ruby, C#, and more. The platform leverages Brainstore, a purpose-built database for AI traces, enabling fast full-text search, low write latency, and quick span load times. It is framework agnostic, SOC 2 Type II certified, GDPR compliant, and supports SSO, RBAC, HIPAA, and hybrid deployment. Pricing starts with a free tier, with paid plans for Pro ($249/month) and Enterprise (custom).

Key Features

Real-time trace inspection of prompts, responses, and tool calls
Evals with LLM-as-judge, code-based, and human scoring
Automatic pattern discovery with Topics (task, issue, sentiment)
Loop agent for autonomous evaluation and prompt optimization
Custom facets for business-specific dimensions (use case, compliance, etc.)
Task-specific trace views and annotation interfaces
One-click conversion of traces to eval datasets
MCP server for querying logs and running evals from IDE
Native SDKs for Python, TypeScript, Go, Ruby, C#, and more
Brainstore database optimized for complex AI traces

Pros & Cons

Pros
  • Free tier available with unlimited users and projects
  • Framework agnostic with no vendor lock-in
  • Comprehensive observability with real-time traces
  • Automatic pattern discovery reduces manual analysis
  • Loop agent automates optimization workflows
  • Purpose-built database (Brainstore) for fast AI trace queries
  • Strong security and compliance certifications (SOC 2, HIPAA, GDPR)
  • Flexible scoring options (LLM, code, human)
Cons
  • Pro plan ($249/month) may be expensive for small teams
  • Free tier limited to 14-day data retention
  • Advanced features (custom charts, environments, RBAC) only on Pro/Enterprise
  • Some features like S3 export and custom policies are Enterprise-only

Best For

Monitoring AI applications in productionEvaluating and comparing prompt and model performanceDetecting drifts, regressions, and silent failuresBuilding and maintaining test datasets from real tracesAutomating pattern discovery from log dataEnsuring compliance and security in AI pipelines

FAQ

What is Braintrust?
Braintrust is an AI observability platform that helps teams trace, evaluate, and discover patterns in AI applications to build high-quality products.
Does Braintrust offer a free tier?
Yes, the Starter plan is free with $10 credits for Topics, 1 GB processed data, 10k scores, 14-day retention, and unlimited users and projects.
What integrations does Braintrust support?
Braintrust is framework agnostic and offers native SDKs for Python, TypeScript, Go, Ruby, C#, and more. It also provides an MCP server for IDE integration.
How does data retention work?
Data retention is 14 days on the Starter plan, 30 days on the Pro plan (with additional paid retention), and custom on Enterprise.
Is Braintrust secure?
Yes, Braintrust is SOC 2 Type II certified, GDPR compliant, and offers SSO, RBAC, and HIPAA compliance with hybrid deployment options.
What is Brainstore?
Brainstore is a purpose-built database for AI traces, designed for fast full-text search, low write latency, and quick span load times compared to traditional databases.