Le Chat is the app developed by Mistral AI, the pioneering French artificial intelligence company. Like ChatGPT or DeepSeek, Le Chat allows everyone, everywhere, to chat with Mistral’s models. Published a few months ago, the app is powered by React Native and Expo.

The talk will be a technical dive into one central building block of the app: text streaming. Allowing LLM’s answers to appear word by word on screen,  HTTP streaming is a classic method - yet a polyfill is still required for React Native's fetch. Why? How does it work exactly? What are the specific native considerations around it? And what else does it power within the React Native ecosystem?

Existing React Native rich text solutions are too slow or unreliable for building complex editors known from modern messaging apps. We solved this by creating a new open-source library called React Native Enriched. This presentation will detail its core features, API and known limitations. You will learn how it was made and technical challenges we had to overcome.

Efficient 3D graphics in React Native is now possible thanks to WebGPU, and it’s an opportunity you don't want to miss. While you may think of GPU as something challenging to handle, WebGPU, combined with tools like Three.js, Reanimated, and Worklets, makes breaking limits and achieving previously impossible become a reality.

WebGPU isn’t just about graphic, offering great computational power that can handle even AI computations directly within your React Native app. Moreover the ecosystem is rapidly evolving with solutions like TypeGPU, which are designed to help you navigate and feel at home in this exciting new space. If you're constantly seeking opportunities to make your app stand out and offer an unmatched, unique experience for your users, then this talk is for you.