A private AI assistant that keeps your data on your device

When you use a cloud chatbot, your words travel to a company's servers. That's fine for "write me a haiku." It's not fine for a medical worry, a legal question, your salary, a rough draft of a resignation, or anything about your family. Those end up logged on infrastructure you don't control.

A private AI assistant removes the server from the equation entirely.

What "on-device" and "private" actually mean

• On-device: the AI model runs on your iPhone's own chip. There is no request to the internet.
• No account: nothing to sign up for means nothing tied to your identity.
• No tracking: your prompts aren't collected, sold, or used to train a model.
• No cloud storage: your chats and notes live in the app on your phone, not in someone's database.

Not every "private" app clears this bar. Some still route through a server "securely." The only version that fully protects you is one where the data physically never leaves the device.

How to use Vault AI as your private assistant

1. Install Vault AI — free, no sign-up. It uses the model built into iOS, so setup is instant.
2. Add a quick profile (optional). Name, job, dietary needs — stored only on your phone so answers fit you without exposing anything.
3. Ask the private stuff. Draft the hard email, think through a personal decision, work out a health or money question — it stays on the device.
4. Use the built-in apps. Private Notes, To-Do, Flashcards and Recipes all run the same on-device model.

The trade-off, stated honestly

An on-device model can't browse the live web, so it won't fetch today's news or real-time prices. What it's great at is the private, personal, everyday work — writing, thinking, summarizing, planning — the exact stuff you least want on someone else's servers.