Castor Plans

Choose the plan that fits your development workflow. All plans include core features with round-trip synchronization.

Free

$0/month

Perfect for individual developers and students

  • Basic diagram editor
  • Code generation (TypeScript)
  • Round-trip sync
  • Community support

AI Models Included

  • nvidia-nemotron-3-super-120b-a12b
  • openai-gpt-oss-120b
  • openai-gpt-oss-20b
  • z-ai-glm-4.5-air

Pro

$29/month

For professional developers and small teams

  • Unlimited projects
  • Advanced diagram editor
  • Multi-language code generation
  • Priority support

AI Models Included

All free models
  • openai-gpt-5-nano
  • qwen-qwen3.5-flash-02-23
  • x-ai-grok-4.1-fast