The app uses Last.fm to log in and get data; their privacy policy is available here. The app also optionally uses your microphone to record audio to send to ACRCloud for music recognition. Their privacy policy is available here. The app also allows you to log in with Spotify to search their database. Spotify's privacy policy is available here. The app does not communicate with Spotify unless you log in. These features are completely optional. Other than that, the app doesn't access or store your personal data.