Socratic is available in the App Store for iOS. You must have iOS 12.0 or up on your device for it to be compatible.
Check which version of iOS you have
Follow these instructions to check which version of iOS is installed on your device:
On your iPhone or iPad, open Settings.
Tap General About.
Check "Version" to see which version of iOS you have installed.
Download the Socratic app
The Socratic app is available for download from the App Store.