I am the developer of this app. You must have a Spotify Premium account to use.
WHAT DOES IT DO?
Well you basically link your Spotify Account and play your music and the app will pickup on your current track info and search Giphy.com for relevant animated gifs and swap them out to the beat of the song. If you click on the image icon at the top right of the player screen you can search your own terms for gifs. Each search per song is saved automatically. Enjoy!
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Nice landing page when viewed on desktop! You should probably tweak it on mobile though - it doesn't scroll and "Download" buttons are nowhere to be seen.
Gmixr
Gmixr
Gmixr