Purchased this application via MacUpdate, and obtained a cross platform license so I could run the app on Windows.
Before discussing the actual software - the developer is very responsive to questions. And, most importantly the licensing model is perfect and very fair from a cost perspective.
The application itself is a little different from a traditional screenshot program - e.g. SnagIt, which I have the most experience with.
While I have not use the program extensively, it is an excellent program. Clarify is more focused on creating a "document" of screenshots. Versus grabbing a screenshot, then annotating, then copying into a destination document.
Instead of the "normal" 3 shot process - Clarify will grab the screen, and place you into its editor to allow you to: annotate the shot (i.e. add text, arrows, shapes), then add text (i.e. instructions) as if it were a word document. You keep adding shots to the document - and text / information - until you are done.
The finished product is a PDF with text, pictures, and instructions.
Coming from a SnagIt 3 step process, there is some re-learning to do. So, minus one star since habits are hard to break.
But, this is an excellent program and highly recommended. This is a slightly different - but extremely valuable - tool than a traditional screenshot/annotation program.
When you add in the developer's responsiveness and the excellent licensing model - its a no brainer. If you need to use screenshots to communicate information to clients, users, or to remember stuff for later this program is well worth a buy.