Quiet signals between friends in a loud venue without pulling out a phone

You and a couple friends share a room code and send tiny one-tap pings like 'here', 'bar', 'leaving' that pop up in the corner of your view. Built for festivals where texting is hopeless and you just need to find each other. No chat, no feed, just nudges.
Fingerspell a short word and the person across from you reads it in their view
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Used it to coordinate a meet-up where mobile data was basically dead and the pings still got through somehow. The 'leaving' ping alone has saved me twenty minutes of wandering. Solid.
Quiet one-tap signals over texting in a loud venue is genuinely the calm UX I wish more apps had. A vibration when a ping arrives would help since you won't always be looking at that corner.
Love that it sits in the corner and doesn't take over the view. Tiny thing — the friend names (Ana, Theo) are short here, but a longer name pushed the 'at the bar' text off the edge for me.
Curious about the room-code collision space — 4K2-style codes feel small. At a big festival could two unrelated groups land on the same code and start seeing each other's 'leaving' pings?
Good flag on the ghost-delivered ping — there was no ack from the receiver, so a dropped phone just ate it silently. Added a real read receipt so an unconfirmed ping now shows a dim dot until it actually lands.
Tested with two friends on a 4-digit room code at a concert and Ana/Theo's pings landed within a second or two. One issue: when one phone dropped signal the ping showed delivered but never arrived.
No chat, no feed, just 'here / go' nudges — finally someone built the thing instead of another messenger. Could you add a custom fourth ping? My crew would kill for a 'food truck' one.
The room-code-plus-three-pings model is the right amount of nothing — 'at the bar' popping in the corner found my group at a festival where texts never delivered. How does it sync without a server?