Apps-on are Post-its that look like the iPhone 4, made to help people who design and develop apps plan out the various stages quickly and easily.
The paper stickies match the exact specs of an iPhone 4 — width, height, display area — and have a dotted grid system that lets you sketch accurately but doesn’t show up if you photocopy or scan the post-it.
I’ve never designed an app, but would love iPhone post-its to write grocery lists on or leave grating reminders about leaving the cap off the toothpaste tube.
A starter pack of five iPhone notepads (50 sheets each) costs $20, available online here.