DoubleCheck is an app for two people to check independently and spot differences. The flow: first person checks → second person checks (without seeing the first person's marks) → compare → only differing rows show in red.
The first person shows a QR code, and the second scans it with their camera. Once the second person finishes, they show a result QR code, which the first person scans to compare. No network is used, so it works even in airplane mode.
No. The second person only sees the item names — the first person's checks are never displayed on screen.
Yes. Whether you pass the same iPhone or use QR codes between two devices, no network features are used, so it always works completely offline.
Yes. You can run several checks of the same checklist in parallel — one per shipment or shift, for example — and check again later if needed.
Yes. From the history detail screen, you can export a PDF and share it.
Neither. The app requests no permissions beyond the camera, and there's no sign-up or login. The camera is only used when scanning a QR code.
DoubleCheck: 2-Person Check