The private AI app for iPhone and iPad

What the iPhone app does

Chat with GPT-6, Claude, Gemini, Grok, DeepSeek and more, and switch models in the middle of a conversation. Cited web search, so you can check where an answer came from. Image Studio and file attachments, right from your phone. Voice input, home screen widgets and Live Activities that follow long answers on the Lock Screen. Every chat, project and model choice synced in real time with the web and desktop apps. The app is free. A free account includes 100 credits every month, and paid plans add larger models and more credits.

Every leading model, one app

Each lab's own app runs only that lab's models. Quad puts them side by side. Models (Quad: GPT-6, Claude, Gemini, Grok, DeepSeek and more; One lab's own app: That lab's models only). Switch models mid-chat (Quad: Yes, with the context kept; One lab's own app: No). Training on your chats (Quad: Never, on any plan; One lab's own app: Depends on the vendor and your settings). Price to start (Quad: Free, 100 credits a month; One lab's own app: Free tiers vary, paid plans often $20 a month). Leave the picker on Smart and Quad chooses a model for each message, or pick one yourself. A quick question can go to a fast model and a hard one to the strongest, without paying for three subscriptions. Quad gives you the models, not each vendor's own app features.

More than chat

Cited web search, so you can check where every answer came from. AI images in Image Studio, and AI video on the Ultra plan. Documents, slides, sheets, forms and diagrams you edit together with Quad beside the chat, then download as Word, PowerPoint or PDF. Projects that keep files, chats and instructions together for one piece of work. Chat with your PDFs, Word files and spreadsheets on models that read them. Everything you make on your iPhone is waiting on your iPad, your computer and the web.

Your iPhone and your computer, together

Start a chat on your phone and finish it on your laptop, or the other way round. Everything syncs. With Quad Link on your computer, you can start agent work from your phone and approve it when it asks, while the work runs on the computer you paired. Documents, slides and images you make in Quad are in your library on every device. Get the desktop app for Mac or Linux, or use Quad in any browser at quad.chat.

Private on every device

Quad never uses your chats or files to train AI models, on any plan, free included. There is no setting to find. Quad never sells your data and never shares workspace content with advertisers. On the Private Lane, chats go only to model providers under a Zero Data Retention agreement, so the provider keeps nothing after it answers. Models without a ZDR route ask you to confirm first. Chats and files are encrypted in transit and at rest, and you can export or delete them yourself at any time. Incognito chats stay out of your history, and their temporary data is deleted from Quad's servers within an hour. The details, and where privacy stops, are on the private AI chat page and the zero data retention page.

Frequently asked questions

Is there one iPhone app for ChatGPT, Claude and Gemini?

Yes. Quad for iPhone runs GPT-6, Claude, Gemini, Grok, DeepSeek and more in one app. Quad gives you the models, not each vendor's own app features.

Which iOS version do I need?

iOS 16.4 or later. The same app runs on iPhone and iPad, and your chats sync between them.

Is the iPhone app free?

Yes. The app is free and a free account includes 100 credits every month.

Do my chats sync with my Mac or PC?

Yes. Chats, projects and settings sync in real time with the web, desktop and Android apps.

Does Quad train on my chats from the iPhone app?

No. Quad never uses your chats or files to train AI models, on any plan, and never sells your data.