PixelShank is an cross-platform app that support to click and measure the width and height of any object on an image and save it as a .png file. It works well in the modern web browser while you can run it as a desktop app on windows, Mac OS or Linux.
PixelShank Logo, made in Photoshop in 5 mins.
Idea, Design and Development process
After two weeks, I made it. The spare time I spent on it may be around 4 days.
A screenshot of the app.
Here is the pre-alpha version, that I spent more time on the process of draw a line with the pixel hints on an canvas. To measure the pixels on an static image, the line, most of time, just need to be marked horizontally or vertically. So I limit the orientation of the preview of the line.
The problem is, to make PixelShank more useful for more designers. I would prefer some functions such as using rectangle to highlight an area and add text as notes. The existing PixelShank function fulfilled my dream of programming, but the function I made doesn't meet my daily requirement.
v0.0.2 Pre-Alpha (GitHub | SourceForge)
PixelShank on Github