MarzsAi
AI chat for iPhone. No account. Nothing leaves your phone.
What it does
MarzsAI is a chat app for iPhone. You type a question and it writes back. There is no account and no sign in. Your conversations are stored on your phone, not on a server. The only thing that leaves your device is the message itself, sent to a model provider to be answered. Built native in SwiftUI with iOS 26 Liquid Glass. In open beta on TestFlight now.
MarzsAI is a chat app for iPhone. Ask it something and it answers. No account, no sign in. In beta on TestFlight, by invite.
TestFlight is how Apple lets you try an app before it reaches the App Store. It is free, and it asks you for nothing. It is a chat app, and it answers questions the way you would expect. It also keeps things for you: your conversations, a short memory of what matters, your cars, your trips. Most chat apps are a front end for a model somebody else runs, and a front end has nowhere to keep any of that. Every thread is stored in a database on the device itself. There is no copy on our server and no account to sync one to. Deleting the app deletes them, and there is no way to get them back afterwards. Answering a question means sending that question out. Where your messages do go, below, says…from marzsai.app
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I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.
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