Simple, brilliant ideas are often obvious in hindsight. Like the great new app, VisualRuler, which allows you to precisely measure the size of an object (like a piece of art you want to frame) using your iPhone.

The app is simple: take a picture of an object next to a credit card or driver’s license – something you’re likely already carrying around at all times – and the app will extrapolate the object’s size by relative comparison, then allow you to export the measurements.

It’s $2.99 on the App Store, and it works like a charm. Measure away.