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Comet vs fractal

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

Comet compared with fractal
DetailComet logo Comet fractal
What it doesThe AI Developer Platform Long-term memory for AI agents that organizes itself and corrects itself
StageNot given MVP
Founded2017 Not given
Based inUS SE
Pricing modelNot given Free
PricingNot given 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
  • LLM trace logging with 40+ integrations
  • Automatic error detection and diagnostics
  • Ollie agent for code fix recommendations
  • Test Suites and 40+ LLM-as-a-judge evaluation metrics
  • Production dashboards and alerts for agents
  • Prompt playground and optimization
  • Agent Playground for local agent development
  • Cost intelligence for Claude Code and Codex tracking
  • 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
  • Truly open-source platform with enterprise-grade infrastructure
  • Traces appear almost instantly even at high volumes
  • Flexible hosting options including self-hosted, cloud, and custom deployments
  • Easy integration with just a few lines of code
  • Opik automatically turns trace data and eval results into code fixes
  • 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  • Never contradicts itself by automatically replacing outdated facts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)74 +1 (up) since last checkNot checked yet no change since last check
Trust Flow (Majestic)280
Citation Flow (Majestic)510
Referring domains (Majestic)44480

4 details filled in for both companies.

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