H--r (iOS; free) has seven filters: Super Hearing (which amplifies sounds), Auto Volume (intended to dampen background noise), Relax (self-explanatory), Happy (which creates lighter, fun effects, though perhaps not the advertised "ecstatic cascades of happiness"), Talk (which will take voices and "autotune them into music"), Office (which creates a cocoon of somewhat annoying sound around you) and Sleep (whispery and spooky). The whole thing is a bit trippy, and I can imagine people using it, well, recreationally.
Each filter has several adjustable settings. Some I got (hello, "bass"), but "space," "depth," "presense" and "brilliance" left me confused. The app would benefit from explanations for digital music laypersons.
Not all the filters or settings will appeal; I found myself selecting the Happy filter because I liked how it amplified and echoed the sound of my keyboard, making me feel productive.
I layered it with the music on my phone, and it mixed impressively well with some up-tempo songs, though that doesn't mitigate the embarrassment factor.
I'm pretty sure I couldn't listen to these effects for long without a work-prohibiting headache. The makers of H--r differ, believing that "in the next few years eartech will have higher impact in our society than vistech" and people will be wearing "hearables" most of the day and night.
I just hope that they make those hearables more comfortable than ear buds and that my filter isn't tuned to Sleep.
The app:
• Name: H--r
• Cost: Free
• Operating system: iOS
• Creator: Reality Jockey
• Review's bottom line: Fun to play with, helpful for work.