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Free version for Windows desktop computers.

Sticky Notes are probably the most common method used to add notes and comments to PDF documents. To add a Sticky Note, simply click at the "PostIt/Sticky notes icon". A sticky note with the calculation tape will be copied to the clipboard and you can paste it to your documents easily.

Version 7.1.0 now allows to choose the text and background-color of your sticky note. 

Stick it tape calculator

Options:

Adding machine with sticky notes

Graphic export options for your sticky notes. Set your prefered text color and note background color.

Calculator with sticky note option 

You can use this sticky notes in all kind of applications. Most users need them for their PDF apps

from Adobe, Nuance etc. 

Here is an example for FoxitPDF: Create a image stamp from the clipboard:

Postit PDF Desktop Calculator