OFFICIAL PAGE: Transcribe+ (in the Apple App Store)
Transcribe+ from Dynamic App Design LLC, is an iOS app for both Apple iPads and iPhones which can perform a number of functions with your audio files including altering their speed and pitch independently as well as AI-based splitting of your audio into 2 or 4 stems. The app includes Dropbox, Google Drive and iCloud integration and can export your separated stems in uncompressed form. Transcribe+ is a free trial download with limitations. You can unlock everything with a single in-app purchase.
Screenshot courtesy of Christopher Kissel