Developer Tools

Thesys

API middleware that turns LLM responses into interactive UI components like charts, forms, and cards in real-time.

thesys.dev

Verified API available Free tier

Quick facts
What is it	API middleware that turns LLM responses into interactive UI components like charts, forms, and cards in real-time.
Pricing	Freemium — from $49/mo
Free tier	Yes
Platform	API
API	Yes
Best for	building AI copilots, creating dynamic analytics dashboards
Domain registered	2014

Data updated Aug. 1, 2026

What does Thesys do?

Thesys's C1 is an API layer that sits between your application and large language models (LLMs), transforming standard text responses into fully interactive user interfaces. Instead of getting back a block of text from your AI query, you get structured, renderable UI components like data charts, input forms, information cards, lists, tables, and even slides. This happens in real-time, allowing your app to dynamically generate the most appropriate interface for each user's request.

The system works as an OpenAI-compatible endpoint, meaning you can integrate it by simply changing your API base URL and adding their React SDK. It supports multiple LLMs like OpenAI and Anthropic, connects to your data via tool calls, and handles streaming and error handling for production use. What sets it apart is its flexibility; you can bring your own custom React components and styling to ensure the generated UI matches your brand and specific functional needs.

This tool is built for development teams creating AI-native applications like intelligent assistants, data analytics dashboards, educational tools, or e-commerce copilots. It's particularly valuable for product teams that need their UI to adapt to evolving use cases without hardcoding every possible state, significantly reducing frontend development time and cost while making AI interactions more engaging for end-users.

AI API Developer Tools

#api#developer tools#frontend#generative ui#llm integration#react#real-time

Key features

What makes it stand out

Turns LLM text responses into live UI components (charts, forms, cards)

OpenAI-compatible API endpoint for easy integration

Supports custom React components and brand styling

Connects to external data via tool calls (databases, APIs)

Real-time, streaming UI generation for dynamic applications

Who is Thesys for?

Who benefits most from this tool

building AI copilots

creating dynamic analytics dashboards

developing adaptive educational tools

Pricing

Free tier available — start without a credit card

Free

5000 C1 API calls
Style customizations
Supports all popular LLMs
Discord Community support

Build

$49.0/month

Everything in Free, plus:

25000 C1 API calls
$0.002 per call overage rate
Higher request priority
Higher rate limits
Email Support

Grow

$499.0/month

Everything in Build, plus:

500000 C1 API calls
$0.001 per call overage rate
Highest request priority
Highest rate limits
Priority Slack Support
Dedicated Solutions engineer (Add-on)
SSO SAML (Coming Soon)

Scale

Custom

Everything in Grow, plus:

Self-hosting or VPC deployment options
Custom rate limits and usage controls
SOC2, HIPAA, and compliance support
Enterprise-grade SLAs & uptime guarantees
Bring your own LLM key (On Request)
Support SLAs

Trust & presence

Domain Domain registered 2014

Gallery

Click any image to enlarge

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