Stash is an offline-first Android music player that syncs your liked songs, playlists, daily mixes, and discover mixes from both Spotify and YouTube Music into a single unified local library. Tracks are downloaded as high-quality FLAC audio. Stash is not an online streaming service. It's a personal-library tool for people who already have Spotify or YouTube Music accounts and want their library available offline on their terms. Studio quality tracks, they're yours to keep.