Equalist helps you create a playlist based on what you and your friends like on Spotify, so you won’t be stuck just listening to your friend’s boring playlist. Better yet, it can do so in a couple of seconds. Also, It’s free and that’s a great price!
Playlist Mutator utilities Spotify's already powerful recommendation system to "mutate" your existing playlists: making happier, sadder, tamer, or more energetic versions of the playlists you love.
Mooderate is a way for you to record your memories and monitor your moods. Express your feelings through photos, emojis, and hashtags. Be able to monitor how weekly and monthly emotions is resulting in your overall monthly moods.