Use Your Phone's Built-In Level Tool

The Problem

You're hanging a picture frame and don't own a level. It looks crooked.

The Hack

iPhone: Open Measure app > Level tab. Android: Search 'bubble level' in Google or download a level app. Place phone on the surface to measure.

Why It Works

Phones contain accelerometers and gyroscopes that detect orientation with high precision — the same sensors used for screen rotation work perfectly as a digital level.

Pro Tips

• iPhone Measure app has a built-in level tab
• Accurate to within 1-2 degrees
• Place on top of picture frame while hanging
• Also useful for checking if furniture and shelves are level