HowTallIsIt app for iPhone and iPad

This app calculates the measurement of the target object in comparison with the reference object in the picture.

e.g.
- measure the height of the person in the picture with you
- measure the height of the person using the scale estimated by a plastic bottle
- calculate the distance in the map image
- measure the height of the baby using the scale estimated by a toys
- record the size of fish
etc.
Find your own way to enjoy this app.

How to use.
1. Select a picture
2. Put the red ruler and fit it to the reference object.
3. Then change the number to represent the length in the real world
4. Put the blue ruler and fit it to the target object
If you want to calculate the measurement of a curved object, pull the middle of the blue ruler. Blue ruler will bent.
The pinch-in and pinch-out zoom gestures are available.

-- Note --
Because the distance between camera and objects is unconsidered, the length measured by this app is not accurate.