For what it’s worth, I’ve decided I have two types of tinnitus.
I have various types of tinnitus, and each can vary in its presence and intensity at different times and on different days.
single tone high frequency (most severe) ~10 Khz
static/hissy high frequency (sometimes broken/crickety)
intermittent chirping high frequency (left ear)
mid frequency (sometimes oscillating, more in right ear) -1250 hz
low frequency continuously variable (left ear) ~100 hz
Most of these are somatic and also have hearing loss, hyperacusis, and TTTS.
It alternates over a day or two between the high frequency single tone and hiss along with intensity changes.
The loud shower sound and water splashing is the only everyday type sound that masks the high frequency. I still hear it over the summer evening crickets, katydids, and cicadas.
Maybe Shore / Auricle could help, but it might not be available for years, especially for wide scale availability.
iPhones, apps, and such won't help lower tinnitus intensity, but some partial masking can help deal with it, which is what I do to enable myself to sleep with severe tinnitus, by blending in some more peaceful cricket, katydid, and cicada sounds. White noise doesn't cut it.