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How does this differ from Vampr and Bandmix, which claim to be the same thing?

Haven't used Vampr. I made this in part because I did not enjoy the "retro" UX of BandMix and the fact that you have to pay money to send a message.

It's literally a Tinder-style swipe interface for musician matching. I recommend taking a realistic look at your competition.

From what I can tell, it's worse than Vampr, but also has a smaller network.