Perfect Playlist

Hey guys, like many people, I listen to music to help with running, and workouts, however I have always found that tempo mis-matching seems to throw off my pace, for example if a low tempo song plays right after a song with high tempo. To fix this I created a free app to sort your songs by tempo. I have also added features where you can set the curve, for example you might want to start off gradually, then keep a steady pace, and finally increase tempo and energy of the songs for a strong finish. The app allows you to do this, and you can sort by many other characteristics of the songs too. A surprising side effect I have also noticed is that because the playlists flow better, I have to skip and add songs less whilst working out, which removes a huge distraction. I am also better able to regulate my breathing, and strokes, so increasing my pace is not as difficult as it used to be because my cadence naturally matched with the tempo. I have used this app for various other activities since, such as creating a party playlist, sorting songs by energy so my sleep playlists work better etc. This is my first app, so feedback would be greatly appreciated. All parts of the app are free and accessible without any limits or premiums.