But I would say that I've been trying to find equivalent equilizer functions that this app has on desktop.

Have you tried RootlessJamesDSP?

The headphones, and any other gear, probably make some difference; I'm balling on a budget, with some tin t2s for iem, and beyer 770s (80 ohm) for cans, through a fiio DAC for the cheaper devices (but my main player is an old lg g7). Now and then I'll break out the portapros, and it's more prevalent since they tend to be a little muffled in the mids and highs no matter what they're plugged into.

But just the difference between something like gmmp, phonograph, musicolet, vanilla, etc, it can be a huge difference for me. Gmmp is decent, but there's static where there shouldn't be, and using the eq tends to distort on the low end even at low amounts of boost.

Can't recall if vinyl stood out from the rest of the pack or not, since it's been a couple of years since I did an extended comparison. All of the ones using the standard android audio processing were prone to some degree or another of mudiness to my ears. Some would get distorted playing through anything other than headphones, particularly with hip-hop and house tracks. That was with multiple aux cables, Bluetooth, and on multiple devices.

But, yeah, I would love it if max ported his eq app to other platforms.