On-device AI for iPhone: use Apple Intelligence in a real app

Apple Intelligence put a capable AI model right inside iOS. But on its own it's plumbing — writing suggestions here, a summary there. To actually use on-device AI for real work, you want an app that wraps it in tools designed for specific jobs.

What on-device AI is good at

• Writing & editing: drafting, rewriting, tone changes, proofreading.
• Summarizing: long notes or text down to the key points.
• Structuring: turning messy input into lists, study guides, or flashcards.
• Thinking: brainstorming, outlining, explaining a concept.

Because it's local, all of this happens instantly, privately, and with no connection.

What it can't do (worth knowing)

An on-device model can't browse the live internet, so it won't pull today's headlines or real-time data. It's built for reasoning over what you give it — which covers most everyday tasks.

How Vault AI turns Apple Intelligence into a toolkit

1. Download Vault AI — it runs on the Apple Intelligence model already on your iPhone, so there's nothing extra to download and no account.
2. Pick a purpose-built tool. Instead of one blank chat, choose from 70+ tools tuned for a specific job — Email Draft, Summarize, Rewrite, Flashcards, Cover Letter, and more.
3. Add a profile. Vault AI adapts answers to your name, job and preferences, stored on device.
4. Use the built-in apps. Notes, To-Do, Flashcards and Recipes all tap the same on-device intelligence.

Which iPhones support it

Vault AI runs on iPhones that support Apple Intelligence, on iOS 26 or later. If your iPhone has Apple Intelligence, you're set.