On-device AI used to sound like a research demo. In 2026 it is a shipping strategy. Run a TensorFlow Lite model directly on the phone, skip the network round trip entirely, and keep the user's most sensitive data on the device that collected it. I did exactly this in Butter Skin , an AI skincare coach that analyzes skin conditions straight from the camera and returns personalized results in under two seconds — the model never leaves the phone.

The app runs on Flutter and Dart, uses TensorFlow Lite for the vision model, Riverpod for state management, and Firebase (Auth, Firestore, Cloud Functions) only for account and progress sync — the AI analysis itself is 100% offline.…