C1 by Thesys - Make AI apps respond with interactive UI in real-time
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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.
Replies
Thesys
👋 Hey folks,
Parikshit here, co-founder of Thesys.
Thrilled to share what we’ve been building: C1, the world’s first Generative UI API 🚀
Most AI apps are still stuck in the terminal era, type a prompt, get a wall of text.
It works, but it’s primitive. AI is unlocking infinite user journeys, but most UIs are static and hardcoded. We built C1 so the interface can finally keep up with the intelligence behind AI-native products.
What is C1?
C1 is an API middleware that augments LLMs to respond with live, interactive UI like forms, charts, cards, dashboards instead of plain text.
What can C1 do?
➡️ One-line setup: npx create-c1-app
➡️ Works with any AI stack (OpenAI-compatible, any framework or MCP)
➡️ Customizable and responsive to your brand
➡️ Supports all tool-calls (databases, documents, APIs)
➡️ Configurable actions, callbacks, and workflows out of the box
➡️ Handles streaming, error states, and production-ready UI flows
➡️ Plug in your own React components with state, logic, and validation
Why does it matter?
✅ Ship interactive AI apps 10x faster
✅ Cut 80% of frontend maintenance costs
✅ Create experiences 83% of users prefer
From copilots to dashboards, e-commerce to search, C1 turns model responses into production-ready interfaces, no manual wiring required.
Invoice generator
@pgd Amazing work, guys! Good luck with the launch!
Thesys
@csaba_kissi Thank you sir :)
1Page
@pgd Wow! loving it
Thesys
@pooran_prasad_rajanna Thanks a lot :D
Yolk
@pgd The product looks great, good luck with gaining new users!!
Thesys
Thanks a lot! @ekulianova
@pgd this is so smart, loved it
@pgd Congratulations on the launch and best of luck! How can I claim the code "GENUI" tho? :D
minimalist phone: creating folders
Who did your video? It is a masterpiece.
Thesys
@busmark_w_nika We created it in-house. Perks of having a small and mighty team.
@busmark_w_nika @pgd name of the tool?
Really impressed!
Thesys
@busmark_w_nika @byalexai Edited with Da vinci resolve. Jitter figma for assets
minimalist phone: creating folders
@byalexai @pgd Oh... I used to edit in DaVinci Resolve. Should go back with it. :)
minimalist phone: creating folders
@pgd You did an excellent job :)
Congratulations on the launch!
Been tracking this product for a while, great idea and product, can’t wait to use it 🙌
Thesys
@yashwin_ghosh Thanks for the support.
Thesys
@raagul_manoharan1 100%, we believe the future of interfaces is dynamic.
Merlin - ChatGPT powered chrome extension (Cmd+M)
Congrats on the launch! Love the direction you’re taking with C1 around real-time interactive UI for LLMs. Excited to try it soon. Thanks for building this.
Thesys
@pratyush_r8 Merlin + C1 would be pretty magnificient.
Wow!! This could be an amazing fit for AdAmigo.ai - testing it! 💪 Upvoted and congrats on what looks like an amazing product!
Thesys
@christopher_pechau AdAmigo looks great. Would love to support your use case.
@abhi_shek1994 Amazing!! Shared your project with the devs! Will keep you in the loop 🚀
Thesys
@christopher_pechau we also have a startup program as well where we work closely with companies build AI native experiences.
Lets ship AI faster!
@zahle_khan AH wow! ust applied — if we’re a good fit for your program and get access, we’ll deploy it this week. This looks like a fantastic fit for us!
Xano
I'm already a user, but I just wanted to chime in and say that I've been very impressed with C1 and the Thesys team. Definitely recommend trying it out!
Thesys
@welldundun This means a lot, Daniel. If you have any suggestions for improving C1, please share them with us on Discord.
Amazing launch! Super super excited to try!
Thesys
@dmundhra Thanks a lot. Looking forward to what you build with C1.
Zennbox
Thesys
@bhu_1 C1 by Thesys is the answer to "what if every ChatGPT response was designed and rendered live but still delivered in realtime"
If you are building an AI agent or a AI workflow, C1 by Thesys would fit right in
No-Code Curated Integrations
Congrats on the launch! Looking forward to test this out :)
Thesys
@iruhdam24 Great. Would love to hear your thoughts