AppLess

Information

AppLess is a generative UI operating system experiment developed by the creators of OpenUI. It represents a vision of a “phone with no apps” where every screen is generated dynamically based on the user’s request.

Instead of installing multiple individual applications, the user interacts with a single interface that streams native UI components in real-time. These components are generated by an LLM that writes in openui-lang, which the OpenUI renderer then turns into interactive native UI elements (Cupertino for iOS, Material 3 for Android).

Main Functionalities and Features

• Zero-App Architecture: No apps to install or home screen full of icons.
• Generative UI: Every screen is created on-the-spot using LLMs.
• Streaming UI: Screens are streamed live and rendered in native UI components.
• Native Performance: Uses React Native and Expo to ensure high-quality, responsive interfaces.
• Prefetching: Next screens are prefetched to ensure instant transitions between generated views.

How it Works

1. User Request: The user asks for a specific task or view (e.g., “show me the weather” or “find a restaurant”).
2. LLM Generation: An LLM generates a response in openui-lang, a compact, streaming-first UI language.
3. OpenUI Rendering: The OpenUI standard interprets the language and renders it into native components.
4. Interaction: The user interacts with the generated screen, and subsequent actions trigger further generations.

Practical Notes

• Experimental Status: AppLess is currently an experiment to push the boundaries of Generative UI.
• Simulated Actions: In its current form, many actions (like placing an order) are simulated and not yet integrated with real-world services.
• Tech Stack: Built using Expo SDK 54 and React Native 0.81.

See also

• AppLess GitHub
• OpenUI
• Generative UI