Features
- Converts LLM outputs into structured UI specifications through the C1 API middleware
- Renders C1 responses as live React components with the Crayon SDK, including streaming
- Works with OpenAI-compatible endpoints by changing baseURL and model name
- Renders context-aware components such as charts or forms
- Builds interactive reports, slides and documents with the C1 Artifacts API
- Supports Model Context Protocol to add C1 to apps like Cursor or ChatGPT
- Registers your own React components to match your design system
- Complies with SOC2, ISO27001 and GDPR with zero data retention
Pricing Details
💵 Pricing (January 2026 Status) Thesys uses a developer-friendly "pay-per-generation" and subscription-hybrid model. Plan Price (Approx.) Key Features Free Starter $0 Access to C1 Playground; limited monthly UI generations; public projects. Pro $49 /mo High generation limits; custom component registration; priority model access. Business Custom Team shared workspaces; advanced analytics; increased API rate limits. Enterprise Custom Private cloud deployment; Zero data retention; 24/7 dedicated engineering support. 🎁 Is the free version a trial or completely free? It is Freemium. The Starter plan is free indefinitely for experimentation and personal projects, though it has limits on the number of interactive UIs generated per month.