Thesys

Thesys is a frontend infrastructure layer for AI products built around generative interfaces. Instead of returning plain text from an LLM, it can produce ready-to-render UI elements in real time—such as forms, tables, cards, charts, and reports.

C1 Generative UI API

At the core is the C1 Generative UI API, which sits between your language model and the UI. It converts model responses into interactive components so your app can respond with structured interfaces rather than paragraphs of text.

Built for AI app developers

Thesys is designed to plug into existing AI assistants and internal tools, helping teams ship UI-heavy experiences with less manual layout work.

• Generate interfaces like input forms, lists, slides, dashboards, and reports
• Use the API as a translation layer from LLM output to interactive UI components
• Test prompts and UI behavior using the website demos and Playground (e.g., travel planning, stocks, reports, and lists)

Best fit

Thesys is a practical option for AI-native teams building products with richer interaction patterns and real-time UI updates, where speed of iteration matters and UI complexity grows quickly.