Blindfold eq is a free eqing plugin by AudioThing, it was inspired by a quote by Matt Wallace from the book Recording Unhinged by Sylvia Massy.
It has 4 bands (LowShelf, LowMid, HighMid, HighShelf), but each knob is blind. There are no indicators or numbers to show frequency values, gain values, or Q values, which is where the blindfold comes from, you have to use and trust your ears, which to me is the best way to make a decision when you are boosting or cutting frequencies.
Quote from Matt Wallace
If I were King of the Universe, consoles would have no indication of frequency near the EQ knobs, because when you show the frequency, then most people EQ by eye. […]
But seriously, you should have no idea of what frequency you are boosting or cutting. It doesn’t matter what number is. It matters how it sounds and how it feels. That’s it!
Video Sneak Peek
https://youtu.be/oPjwXSLtsiI