Spotify app - get key/tempo/signature analysis from spotify API and MusicBrainz/AcousticBrainz

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I built this webapp that enables you to search spotify and if you choose to, your library. Click a track title and You’ll see an in-depth spotify analysis and if a match is found, AcousticBrainz analysis. Log in to spotify and you’ll be able to export your track selections as playlists

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Hi i am creating a similar web app and wanted to ask you some questions regarding using spotify for key analysis. I read online that the key confidence from spotifys data doesnt always seem to be accurate. Did you circumvent this by using the acoustic brainz api? or is the data from your app provided mostly from spotify. Your app is accurate, i checked it compared to other sites, so if it is just spotify that would make my life a lot easier.