Isa is an iPhone and iPad app today. This page covers which devices it runs on, what to do if your iPhone is too old to run on-device models well, and the platforms we plan to support next.Documentation Index
Fetch the complete documentation index at: https://docs.alpha.isaree.ai/llms.txt
Use this file to discover all available pages before exploring further.
Today: 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.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.If your iPhone is too old for on-device models
You don’t have to buy a new iPhone to try Isa. Switch 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: 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.
Coming next
- macOS app. We plan to bring Isa to the Mac so you can use it on a desktop or laptop without buying a new iPhone.
- Android. We plan to support Android phones and tablets in the future.
Next
Choose a model
Pick the right on-device variant for your iPhone or iPad.
Install Isa
Get Isa onto your iPhone or iPad through TestFlight.
On-device vs. cloud
Understand the trade-offs between local and cloud models.