I teach

Mark a stack from your phone

You already know what marking a set of papers costs you. This is the same job, done with the camera you are holding.

How long does it actually take?

Build a sheet in a couple of minutes, print it on ordinary paper, then photograph each paper one after another. Results appear as you go.

What happens when it cannot read a mark?

It stops and asks you, with the photograph of that mark on screen. Nothing is ever graded on a guess, which is the whole reason the number can be trusted.

What it does when it is unsure

Do I need anything special?

A phone and a printer. No scanner, no special paper, no forms to order — and it keeps working in a corridor with no signal.

Try it on a practice class Read how it works