The idea of using multiple phones as speakers to play the same music isn't new. It was popularized by Samsung's Group Cast way back in the Galaxy S3 days and has since gotten over that proprietary requirement thanks to third-party apps like SoundSeeder that made it possible to tune Android devices together, regardless of their brand. As a newcomer in the field, AmpMe has a lot to prove against tough and established competition. The app manages a few victories thanks to cross-platform compatibility, but loses in terms of services supported. For now, that's only SoundCloud, although the developers say more are coming.

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