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Braintrust vs fractal

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Braintrust compared with fractal
Detail Braintrust fractal
What it doesThe active observability platform for agents Long-term memory for AI agents that organizes itself and corrects itself
StageGrowing MVP
FoundedNot given Not given
Based inNot given SE
Pricing modelFreemium Free
PricingStarter plan free with $10 credits monthly, 1 GB processed data, 10k scores, 14-day retention. Pro plan $249/month with $100 credits, 5 GB processed data, 50k scores, 30-day retention. Enterprise with custom pricing. Overage charges at $4/GB for Starter and $3/GB for Pro on processed data. Personal: Free during early access. Unlimited memories, all agents with separate memories, no card required. Enterprise: On request, set up by the team for departmental organization with cross-department sharing and direct support.
Key features
  • Real-time trace inspection
  • LLM scoring and evaluation
  • Production monitoring dashboards
  • Automated pattern detection
  • Dataset versioning and management
  • Prompt optimization with Loop agent
  • Natural language trace investigation
  • Custom annotation interfaces
  • Gateway API for unified access
  • Brainstore database for AI data
  • Self-correcting memory that updates when facts change
  • Historical memory queries with time-based retrieval
  • Automatic topic organization and hierarchy
  • Separate memory for each agent with controlled sharing
  • Multi-agent support via MCP, REST API, or LangGraph
  • AES-256 encryption at rest and in backups
  • OAuth 2.1 authentication and API key management
  • Data export and deletion capabilities
  • 37 MCP tools with automated verification on every code change
What makes it different
  • Built specifically for agents which fail differently than normal software
  • Automatic pattern discovery from production data
  • Framework agnostic with no vendor lock-in
  • Enterprise security with SOC 2 Type II and HIPAA compliance
  • Brainstore query engine for faster production debugging
  • Understands what changed, when it was true, and where it belongs - beyond vector database similarity
  • Never contradicts itself by automatically replacing outdated facts
  • Fully GDPR aligned with built-in privacy by design
  • Two-minute integration with Claude, ChatGPT, Cursor and any MCP client
  • Data stays in Europe on AWS eu-north-1 and never used for model training
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)77 +1 (up) since last checkNot checked yet no change since last check
Trust Flow (Majestic)280
Citation Flow (Majestic)510
Referring domains (Majestic)35300

6 details filled in for both companies.

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