The best alternatives to gestify for Spotify are Simplify for Mac, Spotify Controller, and Skip Tunes. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hand Music is an easy to use music app which can be controlled by moving your palm to any block. Simply position your hand above a block to hear it play.
PlayTray is the key to using your macOS media keys to control Spotify playback on Desktop, Web and Mobile. It allows you to control playback with ease and see what's playing by just tapping the icon in your tray.