Open Source Swift AI Assistants

Lumo iPhone App is the native iPhone and iPad client for Lumo, Proton’s privacy-centric AI assistant that allows users to ask questions, get summaries, generate content, and leverage AI help while keeping all conversations confidential and encrypted. Built with SwiftUI, the iOS app wraps a secure web-powered interface and communicates with the Lumo service in a way that ensures zero-access encryption, meaning even Proton cannot read or log user chats—only the device holder can decrypt them. It includes native features like on-device voice recording and speech recognition, flexible navigation, and payment integration for subscription plans if users choose expanded capabilities. The app’s architecture uses a combination of WebView and JavaScript bridges to power responsive chat UI while retaining strong data protection principles.