[post-it]

There's lots of apps that do it for you too. Scannable is one.

[detritus]

ha! As soon as I wrote that I thought "there's an app in that" and started mentally mapping out how it could work. I figured it'd need to be simple as possible, and even considered using the user's location to preëmpt the paper format choice :)

I'm not an app developer. Probably for the best.