Equalify is a free plugin for Spotify that act as a digital equalizer for Spotify. If you feel you need to improve the listening experience on Spotify, its good to try this Equalify. Equalify is an audio plugin for Spotify that displays an equalizer button next to the search box. Save your own presets, or use one of the default presets provided for you. Keep in mind that the default presets are only meant to give you something to start with, you will need to tweak them to make them sound good.