I used Spotify for a long time and decided to switch to YT Music. I miss some of the playlists I had there. I created this project because I know it can't be that complicated to do this since both Spotify and YT have api-s. I decided to do it in a web app. But I may create native windows / macos / linux versions in the future. For the frontend part I use javascript. I have two backends just for fun, the first is in python using Flask, the second in Java using Spring. This is already done by "tune my music", "soundiiz", "free your music", "song shift".