Private Mode runs on an on-device AI engine. Use Apple Intelligence, or download a model.
Option 1: Apple Intelligence
iPhone: iPhone 15 Pro, iPhone 15 Pro Max, or any iPhone 16 or later
iPad: iPad with an M1 chip or later, or iPad mini (A17 Pro)
Software: iOS or iPadOS 26 or later, with Apple Intelligence turned on in Settings > Apple Intelligence & Siri
Option 2: A Downloaded Model
Works on iPhone, iPad, and Android. Pick a model in the app's Private Mode settings:
Translation
Private Mode translation downloads a language pack (about 30 MB) the first time you use each language. After that, it works offline.
Storage
Keep enough free space for the model you choose. Apple Intelligence manages its own storage in iOS.