# Localight

A SwiftUI showcase chat app demonstrating Apple's on-device Foundation Models on iOS 26 and iOS 27, providing fast, private AI chat with no app server and no data leaving the device.

Localight is a native SwiftUI chat app that runs entirely on Apple's on-device Foundation Models on iOS 26 and iOS 27, showing how to integrate the Foundation Models framework into a native iOS app through `SystemLanguageModel.default`. Once the operating system has downloaded and prepared the model assets, response generation works fully offline with no app server involved.

Apple's third-generation model family includes two on-device models (a dense 3-billion-parameter model and a sparse multimodal 20-billion-parameter model) and three larger server-based models; the operating system chooses which one to use, and Localight does not select a specific model itself. The app keeps no conversation history and offers a minimalist chat interface.

The README states plainly that Localight is a demonstration app, not production-ready, and that model output may be inaccurate, incomplete, or misleading.

Website: https://itstimo.me/projects/localight