It works OK
I can set a custom ringtone for my iPhone with this app
Ringtone Guru User Reviews
Is Ringtone Guru Safe?
Not enough ratings yet to assess Ringtone Guru.
Is Ringtone Guru Legit?
Ringtone Guru - MP3 Trimmer appears legitimate, with a few gaps. AppsHunter Legitimacy Score for Ringtone Guru is 73/100.
Based on 73 of 100 points across 7 verification signals from App Store and developer data.