iPhone Screenshots


Need to measure the size of the object but do not have a ruler? VisualRuler calculates the size of objects in the image using computer vision techniques . You will need to use a card as a reference object. Everything is done offline on your phone.

Because all cards (credit card, library card, public transport card, ID card...) have unified side lengths they can be used as a reference rectangle to calculate sizes of objects in the plane.

1.) Take a picture of an object you want to measure next to any card
2.) VisualRuler will automatically detect the card. If you don't like the detection result you can readjust the reference rectangle.
3.) Add lines or rectangles around objects you want to measure.
4.) Export the result image or share on social networks.

We take privacy concerns serious, especially if you use your credit card or other cards with sensitive information. The picture you take will not be uploaded anywhere to the internet without your knowing.

What’s New

Version 1.4

*added instructions to reduce confusions how to use the app
*iOS 10 compatibility

Ratings and Reviews

2.5 out of 5
6 Ratings

6 Ratings

Anappuserxoxo ,

Not handy

Should be more useful if the app can automatically locate the card and attach the box(the given one).

Ackerman.L ,

Very interesting idea!😄

Although it is not working perfectly at the moment, I am giving it 5 stars for the innovative idea and hoping for the updates for improvement!

Mltk96 ,

Total ripoff

It always shows the exact same size, no matter how really big is the object


altaibayar tseveenbayar
16.5 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Czech, French, Japanese, Portuguese, Simplified Chinese, Spanish, Traditional Chinese

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like