Ruler

Need a length right now and no ruler nearby? Lay the object on your screen, slide the two red lines to its edges and read the size in centimeters, millimeters or inches down to 1/32.

The ruler itself is yours with no timer and no locked units. Switch between cm and inches with one tap. The app picks your usual unit from your region.

Accurate on your phone

• The scale comes from your screen's density.

• To make it exact, calibrate once with a bank card, a 10 cm ruler or a 3 inch ruler. The app remembers this per screen, so foldables keep both.

• Drag the lines from anywhere on the screen, so your finger never hides the mark.

• Lock the lines so a palm can't move them, and tap the reading to copy it.

• Short vibrations on each mark, and the screen stays on while you measure.

Keep what you measured

• Save a measurement with a name: "ring", "shelf screw", "desk".

• Rename, share, reopen or delete it from History, with Undo.

Pro: for what doesn't fit on the screen

• Measure from a photo: put a card, an A4 or Letter sheet or a coin next to the object, lay the blue line on it and drag the red lines. Zoom in for precision, then share the annotated image or save it to your gallery.

• Chain lengths: slide the object along and add parts to measure past the edge of the screen.

• Protractor and bubble level.

• Centimeters and inches side by side.

• Unlimited saved measurements.

Your first photo measurement is included so you can see how it works.

Pro is a weekly or monthly subscription billed through Google Play. It renews automatically until you cancel it in Google Play subscriptions. Prices are shown in the app before you buy.

Works offline. No ads. No sign-up: an anonymous account is created for you, and "Delete my data" in Settings erases it with everything saved on the phone.

Available in English, French, German, Spanish, Portuguese, Arabic, Hindi, Indonesian, Japanese, Korean and Turkish.