When comparing AutoHotkey vs Greenshot (for Windows), the Slant community recommends AutoHotkey for most people. In the question“What are the best power user tools for Windows?” AutoHotkey is ranked 5th while Greenshot (for Windows) is ranked 14th.
Ranked in these QuestionsQuestion Ranking
Pro Can map keys to scripts
Pro Fully programmable
With a full programming language powering the hotkeys, including GUIs, it is powerful and flexible
Pro Scripting of common procedures
AHK allows full scripts to be created and used. it is very flexible.
Pro Allows for extremely easy remapping keys and buttons on your keyboard, joystick, and mouse
You can reprogram any key combination, including the Windows key with a syntax like this one:
that automatically remaps the H key to show a message box.
Can interact with any Windows program / dialog / form, filling fields, submitting data, etc., without dependency on the window placement.
Pro Free and open source
Greenshot is licensed under GPL with source code available on BitBucket.
Pro Freezes screen when you capture
When you enter a capture mode, the screen content is preserved as it was when you started capturing.
Pro Can capture an entire webpage
Instead of just capturing the visible portion of the page, this tool can capture all of the page in one image by scrolling through the page, taking images at set points and then stitching the images together.
Pro Allows annotating, highlighting and obfuscating screenshots
Pro Can be quickly invoked with the print screen button
Pressing the print screen button will allow you to select the captured area.
Pro Classic UI design makes it easy to use.
Pro Selecting custom rectangle is the default
Easy to use selection tool with a magnifier to select only the part of the screen that you need.
Con Programming language is primitive
The base syntax, inherited from the first version of AutoIt, is primitive (a bit like an improved batch syntax). But once used to it, it remains flexible and powerful.
Con This version only works on Windows, not Linux nor Mac
However, the same author now has a separate version of Greenshot for iOS, which is available (for a small fee) in the Mac App Store at https://itunes.apple.com/us/app/greenshot/id1103915944