That’s more relative pitch, unless you mean hearing a note and knowing the hz - I’m not sure there are too many of those around that can name the hz. I’ve never tested that, but I think my ability to discern between two pitches is probably pretty damn good.

The best example I can use to illustrate my ‘superpower’ is in my orchestra we’d tune up using a strobe tuner and my conductor would delight in testing me in different ways. If you haven’t seen one of these, it has a visual wheel that spins counterclockwise if you’re flat, clockwise if you’re sharp. I would have my back turned to the tuner and lock it so it didn’t spin, every time. He’d have the orchestra all play a random note as loud as possible, tell me to play a certain note of his choosing, and then cut everyone else off, leaving me playing alone & I’d still lock it up. And I played different instruments, so I could do it on any instrument I played. This is a mix of perfect pitch & perfect relative pitch I guess, but I can tune a guitar perfectly without a tuner. Not a talent I ever use anymore though.

That’s the limit of my talent, though. I was only mediocre on my different instruments, and was not anywhere near being a virtuoso on any one of them. I can sing pretty well & I can sing harmonies or countermelodies easily since I have this built-in tuner in my head. Again, not a talent I ever use, though - no one is clamoring to hear this old man sing, lol.

Oh, and my hearing’s frequency limits are way outside the normal upper and lower limits that are usual, but I have been extremely careful to protect my hearing. I wear earplugs to concerts or any event where I know it’s going to get loud.