What is C1 by Thesys?

C1 is an LLM API that turns model responses into live, adaptive user interfaces in real time, such as forms, tables, and charts, rather than returning plain text.

How does C1 differ from tools like Lovable or Bolt?

While Lovable and Bolt help design UI before an app goes live, C1 builds and renders the interface dynamically at runtime based on the user's specific context.

Can I use C1 with any LLM?

Yes, C1 is compatible with leading models including GPT-4o/5, Claude 3.5/4.6, and Gemini Pro through its OpenAI-compatible endpoint.

Can I bring my own UI components?

Yes, C1 allows you to use your own React components and design systems, building on top of the Crayon UI library for full customization.

Is it secure for enterprise use?

Yes, Thesys provides enterprise-grade security including GDPR, SOC2, and ISO27001 compliance, with zero data retention available on paid models.

Does it support real-time data?

Yes, C1 supports streaming and tool calls to pull results from databases, APIs, and documents directly into the generated UI.

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UI Design

Freemium

C1 Artifacts API - Thesys

Transform AI responses into interactive, real-time UI components like charts and forms using an OpenAI-compatible API and React SDK.

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Rating

Reviews

Upvotes

4 months ago

Listed

Generative UI

AI API

React Components

Interactive UI

Developer Tools

AI Agents

Dashboard Design

Data Visualization

Tool information

Provider

Thesys Inc.

Platforms

Web

Node.js

Python

React

Languages

English

API Available

Yes

Added to directory

4 months ago

Last updated

about 2 months ago

Rating

Not available

Pricing

Freemium

About C1 Artifacts API - Thesys

What the tool does and who it's for

C1 by Thesys is a specialized Generative UI API that enables AI applications to respond with interactive, structured user interfaces instead of plain text. It functions as an OpenAI-compatible endpoint that outputs production-ready UI components like charts, forms, tables, and dashboards in real-time. Built on the Crayon UI library, it allows developers to integrate adaptive frontends into their AI agents and copilots. The API supports leading models from OpenAI, Anthropic, and Google, providing a seamless bridge between LLM logic and dynamic React-based rendering.

Key capabilities

Generative UI Output: Converts LLM responses into live, adaptive user interfaces rather than just text.

OpenAI Compatibility: Plugs into existing AI stacks using a familiar OpenAI-style API endpoint.

React SDK Integration: Provides specialized hooks and components for rendering dynamic UI in React apps.

Multi-Model Support: Compatible with Claude 3.5/4, GPT-4o/5, and Gemini Pro via a single interface.

Customizable Styling: Built on Crayon UI, allowing developers to apply brand themes, tokens, and custom logic.

Real-Time Rendering: Supports streaming of UI components for a responsive user experience.

Enterprise Security: Offers SOC2, ISO27001 compliance, and zero data retention options on paid tiers.

Tool Call Integration: Connects to external databases and APIs via standard LLM tool-calling patterns.

Pricing

Freemium — plans below

Free

$0/mo

3,000 API calls / month
Up to 3 agents
Unlimited team members
Preset styling
Community support (Discord)

Build

Grow

$499/mo

Advanced scaling limits
Priority support
Enterprise-grade reliability
Custom styling and components

Custom

Contact sales

Tailored enterprise limits
Private deployment options
Dedicated account management

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