[freemanjiang]

https://www.beatsync.gg/

I launched this on HN over the summer, but it's millisecond-precise audio synchronization for multiple devices, performed purely in the browser! I'm sitting at around 5K daily active users now. Also, it's open-source!

[pra-dan]

I have 800 Mbps and yet couldn't connect to any of the 4 rooms I tried.