Do
An offline-first task manager — every task lives on the device first, with a barcode scan as the way to move a task to another device without needing a network at all.
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The problem
Task apps assume a connection. Lose it and most of them either stop working outright or quietly stop syncing until something's missing later — and sharing a task to someone else's device almost always routes through an online account, even when both devices are sitting on the same table.
The approach
Every task is created, edited, and stored locally first, so the app works identically with no connection at all. Moving a task to another device is a barcode scan, not a login — sync to the cloud is there for when you're back online, but it's optional, never the thing the app depends on to function.
