Hardware requirements

Isa runs on the iPhone, iPad, and Mac. This page covers which devices it supports, the differences between the platforms, what to do if your iPhone is too old to run on-device models well, and the platforms we plan to support next.

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iPhone and iPad

Isa requires iOS 26 or later and has been tested on iPhone 13 and newer. Older iPhones running iOS 26 may still work, but we haven’t verified them. If you’re not sure whether your iPhone supports iOS 26, check Apple’s official compatibility list before installing — the iPhone 11 and later generally support it, but Apple’s list is the source of truth.

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Mac

Isa requires macOS 26 or later and a Mac with Apple Silicon (an M-series chip). Intel Macs are not supported. Macs generally have more RAM than iPhones, so larger on-device variants that won’t load on a phone run comfortably on a Mac. See Choose a model for what your Mac’s RAM can hold.

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Differences between the platforms

Isa works the same across iPhone, iPad, and Mac, with two exceptions:

• Scan Doc camera capture is iPhone and iPad only. On the Mac, Scan Doc works with images and PDFs you pick from your files instead.
• Local MCP servers — servers running on the same machine as Isa — work on the Mac only. iPhone and iPad connect to remote MCP servers.

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Picking a model that fits your device

Isa runs LLMs and Agents on-device, which means model size has to fit your device’s RAM. A 4B model that runs comfortably on an iPhone 17 Pro will fail to load on a smaller phone. See Choose a model for guidance on picking a variant that fits.

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If your iPhone is too old for on-device models

You don’t have to buy a new iPhone to try Isa. Two ways around it:

• Use the Mac app. If you have an Apple Silicon Mac, install Isa there — its RAM handles on-device models that a small phone can’t.
• Switch to a cloud model. Set the Primary Agent to a cloud model — cloud models run on the provider’s infrastructure, not your device, so they work on any iPhone that supports iOS 26.

One caveat on cloud models: Agents themselves are on-device only. A cloud Primary Agent lets you chat in Patient Chat and Workspace, but invoking an Agent (via @ or in Workspace) still needs an on-device model with enough RAM to load it.

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Coming next

• Android. We plan to support Android phones and tablets in the future.

We don’t have a public date yet. Join the Isaree Discord for updates.

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