With a blog post published today, Evernote has announced they'll end support for various versions of Skitch (including iOS), Clearly, and Evernote for Pebble. Skitch for Mac will continue to receive support.
Specifically this means that as of today, we will no longer be making updates to these apps and as of January 22, they’ll no longer be available for download.
If you currently use any of these apps, you’ll find that they may continue to work for some time beyond January. We are not turning these apps “off,” but external changes like updates to your operating system or browser may break features or functionality at any point in the future.
The discontinuation of Skitch for iOS doesn't come as a surprise: Evernote has been discontinuing other apps to put more focus on the main product; many of the dedicated Skitch functionalities are also available in the Evernote app; and, Evernote had left Skitch for iOS languishing anyway. Evernote acquired Skitch in August 2011.