Amplifyr

Upload an MP3, get a shareable room link, and every device that opens it plays the track in sync — turning a room full of phones into a distributed speaker system.

The idea was simple: what if every phone in the room became a speaker? Latency, synchronisation, and real-time coordination made it a proper systems problem disguised as a party trick.

Built in a team of five at BrumHack 5.0. The demo caused absolute chaos — every device in the room started playing simultaneously but slightly off beat. The judges couldn't stop laughing, everyone had a good time — albeit after 24 hours of no sleep.

Won BlackRock's prize.