An AI chatbot that works offline on your iPhone

Most AI chatbots — ChatGPT, Gemini, Claude and the rest — are just a thin app in front of a data center. Type a message, it's sent over the internet, a server answers, and the reply comes back. No connection means no chatbot. Worse, everything you send passes through someone else's servers.

An offline AI chatbot flips that around. The model itself lives on your phone, so the conversation happens locally with nothing uploaded.

Why people want an offline chatbot

• Flights and travel. Airplane mode, foreign SIM, no roaming — the AI still works.
• Dead zones. Subways, elevators, basements, rural areas, festivals.
• Privacy. Sensitive questions you don't want sitting on a company's servers.
• Speed and cost. No round trip to a server, and no metered API bill.

How to chat with AI offline using Vault AI

1. Download Vault AI free from the App Store. It uses the Apple Intelligence model already on your iPhone, so there's no giant model to download and no account to make.
2. Open a chat. Tap into the chat and type like you would with any assistant — "what are some high-protein meals I can prep on Sunday?"
3. Turn on airplane mode if you want proof. The answer still streams in, generated right on the device.
4. Keep going. Ask follow-ups, brainstorm, draft messages, get explanations — all with zero connection.

What to expect from on-device AI

An on-device model is smaller than a giant cloud model, so it's tuned for everyday tasks — writing, rewriting, summarizing, brainstorming, explaining, planning — rather than looking up live facts (it can't, there's no internet). For the vast majority of day-to-day questions that's exactly what you need, and you get it instantly and privately.

Vault AI also goes past a single chat box: it includes 70+ purpose-built tools and built-in Notes, To-Do, Flashcards and Recipes, all running the same offline model.