Tony Bongiovi (yes, if the name sounds oddly familiar, it’s because you’re probably thinking of his cousin, Jon Bon Jovi) should know a thing or two about sound, hopefully; he’s had a hand in producing albums from the likes of Jimi Hendrix, Aerosmith, and of course, his famous cousin.
The free version of the app comes with just two earphone profiles (Apple buds with mic and without — and surprisingly, there’s a difference in the way the two profiles sound); a buck buys you the full version with a ton more profiles.