Stitcher can be used with any iOS device running iOS version 8.0 or later.Older versions of Stitcher are no longer supported but remain usable.
Although older versions of Stitcher are not directly accessible from the Apple App Store, if you have an older iOS device and have previously downloaded and associated the app with your Apple ID, you may be able to restore a compatible version using the following instructions:
https://www.howtogeek.com/263568/how-to-install-older-versions-of-ios-apps-on-an-old-iphone-or-ipad/