iRingg is considered as the best ringtone app for iPhone. It is a desktop app for Windows and Mac that lets you create your own custom ringtones in a fun way. iRingg allows you to convert any YouTube or SoundCloud sound into a custom ringtone and then personalize it by adding different sound effects. Its 6-Sense technology recommends songs that you would like as your ringtones, according to your music taste. It is incredibly easy to use.