Thesys is a developer platform for building generative UI applications. There are 2 major components of building your own generative UI application:

• API - C1 is our flagship Generative UI API that leverages the power of LLMs to generate UI on the fly.
• Frontend - Crayon is our open source, MIT licensed React framework that integrates well with C1 and allows you to present your end user with a live app that they can interact with.

​

The GenUI API

C1 is a Generative UI API that allows you to build dynamic, intelligent interfaces. You can use C1 to build your own AI interfaces either via

• Replacing your presentational layer LLM with a C1 endpoint
  This is the preferred way to use C1 when building a new application as it introduces the least amount of latency and cost.
• Adding a layer of UI generation to your existing LLM workflows by visualizing your outputs
  This is useful when you already have a LLM workflow but still want to present your users with a more engaging interface than a simple text output.

​

The Frontend Framework

Crayon is our open source, MIT licensed React framework for shipping production-ready stunning generative applications. Crayon is designed to integrate seamlessly with C1 but it has no dependencies on Thesys and can be used with any LLM or API.

​

Get Started

If you’re new to C1, you can get started by either:

​

Develop with C1

We are assembling a set of guides to help you get started with building your own functional GenUI interfaces.

​

Capabilities

• C1 can generate UI for any use case, any data.
• Out of the box integration with Crayon for easy deployment of end-to-end GenUI applications.
• UI Generations can be guided via system prompts.
• Supports integration with external tools via function calling.
• Supports a wide variety of UI components via Crayon.

​

Support