MZSoft Studio
Three Ways to Install a Custom Ringtone on iPhone: GarageBand, iOS 26 and Mac
TL;DR
iOS 26 and later: Use as Ringtone from the share sheet. Any iOS: open the project in GarageBand. With a Mac: sync the file through Finder. The app assembles the GarageBand project for you.
Route 1: Use as Ringtone (iOS 26+)
Share the exported file and choose Use as Ringtone.
Route 2: GarageBand
The app builds the GarageBand project, so you only need to share it.
Route 3: Mac sync
Follow the in-app, step-by-step instructions to sync via Finder.
FAQ
Which route is fastest? On iOS 26 and later, Use as Ringtone from the share sheet.