You can use it on a mac and windows. You can search for ringtones, so if you have a ringtone from a song you don’t have it’s very easy to do. There is a specific iTunes version. All you have to do is just click on it and iTunes automatically thinks it’s a ringtone. You don’t have to sign up for anything. It’s awsome. If the link doesn’t work, just google it but I’m sure it works. ...