Frontend infrastructure for AI products.

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August 26, 2025

Thesys

UI design

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Frontend infrastructure for AI products.

API AI Frontend Infrastructure Generative UI API Real-time UI React SDK Dynamic UIFree + from $1.60

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Overview Discussion 1

Overview

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C1 is a Generative UI API that augments LLMs to respond with interactive UI like charts, forms, cards, and more, in real time. It integrates seamlessly with any LLM, framework, or MCP in just 2 lines of code.

Ship AI apps 10X faster with 80% less UI overhead.

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Initial release

August 26, 2025

Initial release of Thesys.

Author

Nikita Shrivastava

@nikita-shrivastava

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Joined: August 2025

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UI design Thesys

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abhishek mishra

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Sep 1, 2025

@ initial release

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@Thesys

Using Thesys has been a game-changer for us. We can now ship AI features with interactive UIs in a fraction of the time it used to take. It’s simple to use and saves us so much effort.

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Pros and Cons

Pros

Generative UI API

Dynamic Real-time UIs

Uses React SDK

Supports Large Language Models

Customizable Interfaces

Integration Compatibility

Supports any Language

Framework Compatibility

MCP Server Compatibility

Real-time Rendering

Data Security

No UI Bottlenecks

Overcomes Shipping Delays

Supports Anthropic Models

No Hardcoding Requirement

Flexible Customization

Provides High Engagement UI

Promotes Context-sensitive Frontends

Handles Infinite User Journeys

Easy UI Automation

Nodes.js and Python Compatibility

Built by developers

Prompt-controlled UIs

Upgrades Legacy UI

Boosts User Engagement

End-user Experience Enhancement

Delivers Interactive UI

No Data Storage

Complies with Industry Security

Secure Frontend Infrastructure

Real-time Adaptive UI

Return Structured UI Components

Adapts to Logic, State

Supports Custom UI Components

View 29 more pros

Cons

Requires engineering setup

Depends on LLM accuracy and prompt quality for UI generation

Outputs can vary slightly, making results non-deterministic

Design system integration is still evolving

Real-time rendering may add performance overhead at scale

Q&A

What is Thesys and how does it work?

Thesys is a frontend infrastructure designed to transform AI products by creating dynamic, real-time User Interfaces (UIs) through its C1 Generative UI API. C1 works as an API layer on top of Large Language Models (LLMs), transforming responses from LLMs into live, interactive frontends with the power of React SDK.

How does the C1 Generative UI API of Thesys transform responses from LLMs into live frontends?

The C1 Generative UI API works as an API layer on top of Large Language Models (LLMs). It takes the responses from these models and turns them directly into live, interactive frontends using React SDK, thus transforming plain AI responses into engaging interfaces for users.

How is Thesys' UI customizability?

Thesys provides robust customizability of its user interfaces. Designed to generate UIs directly from model responses, Thesys allows for easy customization to adapt to unique business needs and user experiences.

What kind of compatibility does Thesys offer in terms of language, framework and MCP server?

Thesys has been designed to be universally compatible. It can integrate seamlessly with any language, framework, and MCC (multi-cloud connector) server, enabling broad usage across various digital platforms.

How does Thesys ensure data security?

Thesys prides itself on its strong commitment to data security. It does not store the user's data and adheres strictly to the industry's security standards, providing a secure environment for generating and handling AI-driven response interfaces.

How does Thesys overcome shipping delays in AI?

Thesys effectively combats shipping delays often encountered in AI by employing its unique, real-time UI generation. By transforming model responses directly into live interfaces, it eliminates the time-consuming requirement of manually developing UI for every potential AI output, thus reducing the time required to ship AI products.

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What is the role of Thesys in eliminating UI bottlenecks in AI-driven products?

Thesys plays a pivotal role in eliminating UI bottlenecks in AI-driven products. The C1 API in Thesys allows for real-time rendering of interfaces directly from model responses, bypassing the usual process of hardcoding the UI for every possible user query or state, thus eliminating any potential UI bottlenecks.

How many LLMs does C1 in Thesys support?

C1, the Generative UI API provided by Thesys, supports multiple Large Language Models (LLMs). This includes models from cultured AI pioneers like OpenAI and Anthropic, providing a wide range of conversational models for UI generation.

Can Thesys match my existing company's design system?

Indeed, Thesys can match your existing company's design system. In addition to turning model responses into engaging interfaces, Thesys allows you to customize these interfaces to match your existing design, ensuring that your AI product retains its brand uniformity.

How does Thesys promote the development of context-sensitive frontends?

Thesys promotes context-sensitive frontend development by employing C1, a Generative UI API. With C1, interfaces are not just built from model responses, but they are also adapted to the current context. This means the UI can intelligently accommodate any user query or state, resulting in a context-sensitive and intuitive user experience.

Do I need to hardcode the UI for every user query while using Thesys?

No, there is no need to hardcode the UI for every user query when using Thesys. Thesys automates this process through C1, its Generative UI API, which automatically transforms model responses into live interfaces, eliminating the time-consuming and laborious process of manual hardcoding.

What is unique about Thesys' real-time rendering of interfaces?

Thesys is unique in its real-time rendering of interactive interfaces. Instead of a time-lagged response, Thesys's C1 API layer transforms responses from Large Language Models into an engaging, interactive UI in real-time, ensuring that the user's interaction with the AI product is uninterrupted, smooth and enjoyable.

Does Thesys support other models apart from OpenAI and Anthropic ones?

Yes, besides supporting models from OpenAI and Anthropic, Thesys's C1 Generative UI API is designed to be compatible with multiple Large Language Models (LLMs). Although specific models are not listed on their website, the documentation explicitly states that there is no locking into a single provider, hinting at the support for a wide range of models.

Is Thesys compatible with my current MCP server?

Yes, Thesys is designed to be compatible with any MCP server. This universal compatibility allows seamless integration across varied platforms, enabling businesses to leverage Thesys's real-time interactive interface generation in a broad range of environments.

How does Thesys enable high engagement interfaces?

Thesys enables high-engagement interfaces by utilizing its C1 Generative UI API to create dynamic, real-time UIs directly from model responses. These interactive interfaces adapt to the user's interaction context, resulting in a highly engaging user experience.

Can I use any language of choice with Thesys?

Yes, Thesys is compatible with any programming language. Designed for universal integration, Thesys presents the flexibility and ease to work with the developer's language of choice, thus eliminating the boundaries of specific language constraints.

What are the latency issues I can expect while using Thesys?

Thesys has been designed to render interfaces in real time without introducing any latency. Thanks to the power of the C1 Generative UI API, users can engage with live, responsive interfaces without experiencing any delay, enhancing user experience and maintaining smooth interaction flows.

How does Thesys directly turn model responses into interfaces?

Thesys utilizes its C1 Generative UI API to transform model responses into live interfaces. The API serves as a layer over Large Language Models and, using the power of React SDK, transforms LLM responses directly into interactable frontends in real time, making static AI responses a thing of the past.

What are the possibilities for customization in Thesys?

Thesys offers extensive possibilities for UI customization. With its C1 API, it not only generates UIs directly from model responses but also allows these interfaces to be customized easily. Moreover, it provides the flexibility of customization to match your company's existing design system, enabling you to maintain your brand's unique look and feel.

Can Thesys operate without any shipping delays?

Yes, Thesys is designed to operate without any shipping delays. By automating frontend generation with its C1 API that turns model responses directly into live interfaces, Thesys eliminates manual UI development and mitigates shipping delays often associated with AI application development.

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