C1 by Thesys
Make AI apps respond with interactive UI in real-time
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C1 is a generative UI API from Thesys that lets an LLM respond with interactive interface elements, charts, forms, cards, and more, in real time, instead of only text.
It integrates with any LLM, framework, or MCP setup in about two lines of code, and the makers say it lets teams ship AI apps far faster with much less UI work.
It is aimed at developers building AI applications where the response should be something the user can interact with, a dashboard, a form, a comparison, and who do not want to hand-build a custom front end for every kind of answer the model might give.
AI-assisted draft, human-reviewed before publishing — see how we choose & review tools.
Why we picked it
C1 earns its spot for making an LLM respond with actual interactive UI, charts and forms, not just text, in about two lines of code — worth naming for developers who've hand-built the same chat-to-interface glue for every new AI feature.
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