Hi Product Hunt 👋 My older daughter was born on Qixi (Chinese Valentine's day). My younger one was born on February 14th. Both are Valentine's Day. One of those dates moves every year; the other never does. I spent a while trying to explain to people why that is, and it always turned into a lecture nobody asked for. So I stopped explaining and turned it into sound instead. SIXTY gives every date a short piece of music. Your birth date and hour shade the notes, so today sounds different for you than it does for me. Sixty days make a full cycle, and then it starts over. There is no generative model in it. A date and your birth details run through a pure function to a note list, and the phone renders that with a sampled piano and a small additive synth. It is repeatable by design, not regenerated on each play, which also means it plays with no network. Your birth date stays on your phone and there is no sign-up. Built during RevenueCat's Shipaton 2026. Two things I would genuinely like to hear about: whether the first song makes sense without any explanation, and whether the second one makes you want a third. You can hear sixty of them in the browser before installing anything: https://sixty.rollitinno.com/60/

SIXTY · 60

Turn any date into music.

Turn any date into music.