I will build an offline android app that syncs between phones

Some work happens where there is no internet. A field, a market, a building site, a village, a warehouse, a place where the signal dies at the worst moment. Most apps simply stop working there. Mine don't.

I build Android apps where several people work together with no server and no internet. The phones share data directly with each other over local Wi-Fi, a hotspot, a nearby connection or a scanned code, and everyone ends up holding the same correct information, even if each person made changes while disconnected.

What I build:

- Shared records that several people can add to and edit at the same time, offline

- Phone to phone sync over local Wi-Fi, hotspot, Bluetooth or QR code

- Correct merging when two people changed the same thing while they were apart

- Signed records that show if anyone changed history afterwards

- An honest fallback when no connection is possible at all, instead of an error screen

Live on Google Play from my own portfolio: Murmur (nearby messaging with no internet), Naqil (direct phone to phone transfer), Ittisal (encrypted calling and messaging).

Tell me how many people work together and where they are when they do it.