It depends on what you used Zedge for. If you want another library of ready-made tones, Audiko and the iPhone's own Tone Store in Settings are the closest. If you want to cut a ringtone from a song you have, GarageBand on iPhone or a ringtone cutter on Android does it.
If you want a ringtone nobody else has, a generator is the alternative: Ringoz makes an original ringtone from your own words instead of offering a catalog to download from. Every tone is new, sung, and made for a phone. Our Ringoz vs Zedge page compares the two in detail.
Related questions
Can AI make a ringtone for me?
Yes. AI apps can now write and sing an original ringtone from a few words.
How do I make a custom ringtone on Android?
Save a short audio file to the phone, then add it in Sound settings.
How do I make a custom ringtone on iPhone?
Get a sound of 30 seconds or less, add it as a ringtone, then pick it in Settings.