I know on the hearing aides themselves it’s called “Zen” which includes white noise options, narrowband white noise, and the fractal tones. I also think there’s an option for combining white noise with fractal tones. Don’t know if there is a “notched therapy” option (play white noise or other sounds but excluding the frequency of your tinnitus.
The fractal tones can also be tuned by average frequency and the number of tones played per time period per channel. I know mine plays more tones on the ear opposite where my tinnitus is.
I’ll post another reply if I can confirm a good fractal tones app. I did a short search in the past but gave up when I came up empty.
Still looking. Closest I’ve found so far aside from the Widex app is this web page based generator:
https://mynoise.net/NoiseMachines/acousticPianoSoundscapeGenerator.php
They also have other background noise options:
https://mynoise.net/
It’s free with optional donations.
They have an android app but it’s out of date.
Edit: Theres also Nature space but likewise, their android app is out of date (unsupported on newer devices)
http://www.naturespace.org/