C1 by Thesys
C1 by Thesys is an API middleware that transforms large language model (LLM) responses into live, adaptive user interfaces in real time, enabling developers to build dynamic AI-powered apps with interactive UI components like forms, charts, and tables.
C1 by Thesys is api software teams evaluate for developer tools. Use this page to review pricing, integration signals, and the best alternatives before you commit.
Used in These Packs
Quick Overview
Best for: Developer Tools
What it does
API software for decision-makers comparing workflow fit and alternatives.
Best fit
Developer Tools
Pricing snapshot
Contact for pricing
Next step
Compare C1 by Thesys with similar tools before you shortlist it.
Compare this tool before you shortlist it
Review alternatives, pricing posture, and workflow fit side by side.
C1 by Thesys
C1 by Thesys is an API layer built on top of large language models (LLMs) that converts their text responses into structured, interactive UI components such as forms, tables, charts, and layouts. It uses a React SDK to render these live interfaces in real time, allowing developers to create intelligent, context-aware frontends for AI-powered applications without hardcoding UI for every possible user interaction. Supporting multiple LLM providers including OpenAI and Anthropic, C1 offers flexibility and customization to match company design systems, leveraging Crayon's UI library for theming and component support. It is designed for teams building AI-native software agents, copilots, and tools where dynamic, evolving interfaces are essential.
Make AI apps respond with interactive UI in real-time
Own this listing?
Claim this page to add pricing, features, screenshots, and verified owner details.
Claim this listingKey Features
Real-time Adaptive UI
Transforms LLM responses into live, interactive user interfaces that adapt dynamically to user input and context.
Multi-LLM Support
Works out of the box with leading LLMs including OpenAI and Anthropic, with ongoing additions for broader compatibility.
React SDK
Provides a React software development kit to render structured UI components directly in applications.
Customizable Design System
Built on Crayon's UI library, allowing customization of themes, tokens, and components to match company branding.
Structured UI Components
Outputs UI elements such as forms, tables, charts, cards, and layouts instead of plain text.
Fast and Secure
Designed for fast, secure, and real-time rendering of dynamic interfaces.
Pricing
Claim this listing to add current pricing tiers.
Use Cases
AI-Native Software Agents
Build intelligent agents that interact with users through dynamic, context-aware interfaces.
Copilots and Assistants
Create AI copilots that adapt their UI in real time based on user queries and state.
Dynamic Task-Specific Interfaces
Develop tools with interfaces that evolve quickly to meet changing user needs without static UI limitations.
Rapid Prototyping and Deployment
Accelerate time to market by generating live UI components directly from LLM outputs.
Integrations
OpenAI
Supports OpenAI models for generating LLM responses.
Anthropic
Supports Anthropic models for LLM responses.
Crayon UI Library
Enables UI customization and theming through Crayon's component library.
Benefits
Limitations
Frequently Asked Questions
What does C1 by Thesys do?
Which LLMs does C1 support?
Can I customize the UI generated by C1?
Is C1 suitable for production applications?
Getting Started
- 1 Step 1: Obtain an API key from Thesys and set up your environment variable THESYS_API_KEY.
- 2 Step 2: Use the provided OpenAI client with the Thesys base URL to make chat completion requests.
- 3 Step 3: Integrate the C1 React SDK in your frontend to render the structured UI components returned by the API.
Support
docs
Documentation and API usage examples are available on the Thesys website.
contact
Contact can be made via the Thesys contact page for support inquiries.
API
API documentation and usage examples are available on the Thesys website and include usage of the OpenAI client with a custom base URL.
Rate limit information is not provided in the available content.
Compare C1 by Thesys with similar tools
See how it stacks up against alternatives
Related Tools
View all 127 →
psychoroid-com
psychoroid.com is a platform offering a 3D engine and community resources for creators and developers to build and share 3D content.
Powered By AI
PoweredbyAI is a comprehensive platform offering a curated list of over 4500 free AI tools across various categories, designed to help users discover, save, and utilize AI-powered solutions for diverse needs in 2025.
future-agi
FutureAGI is a comprehensive AI agent engineering and optimization platform designed to help enterprises achieve up to 99% accuracy in AI applications across software and hardware, offering tools for evaluation, optimization, monitoring, and protection of AI models.
portkey-ai
Portkey is a comprehensive production stack designed for Gen AI builders, providing a unified platform with gateway, observability, guardrails, governance, and prompt management to streamline AI integration and operations for developers and organizations.
ToolSDK.ai
ToolSDK.ai is a free TypeScript SDK providing instant access to over 5000 MCP servers and AI tools, enabling developers to build agentic AI applications with just one line of code.
Defapi
Defapi is an AI model API aggregation platform that provides unified, pay‑per‑use access to leading AI models (OpenAI, Anthropic, Google, and more), with intelligent routing for cost optimization, enterprise-grade security, monitoring, and developer SDKs.
Premium Alternatives
imitate-ai
Imitate AI is a creative design tool that allows users to generate copyright-free images resembling their original reference pictures using AI technology, simplifying the process of sourcing unique visuals.
Hyperenhancer
HyperEnhancer is an AI-powered image enhancer that upscales and restores low-resolution photos into high-fidelity, detailed images using content-aware, region-based enhancement—ideal for photographers, eCommerce, archival restoration, and digital artists.
Chat
NanthAI Chat is a multi-model AI chat platform that lets users compare responses from models such as ChatGPT, Claude, and Gemini side-by-side and advertises significant cost savings (claimed up to 95% cheaper). It targets developers, researchers, and teams evaluating or deploying conversational AI.
Argumentessay
Argument Essay is a professional essay-writing service that connects students with expert writers to deliver plagiarism-free academic papers, starting at $9.49 per page. The platform offers wallet-secured payments, 24/7 AI-powered chat support, and internal quality checks for a variety of academic assignments.