I've used—and liked—iA Writer on and off over the last couple of years, and while it's never become my primary writing environment I'm very keen to try out the new Writer Pro environment. This looks like quite an achievement. No surprise to hear it was four years in the making.
Writer Pro’s simple workflow is built around how you work: Start with your ideas in Note, move to Write to flesh them out, progress to Edit for refining, then move to Read when you’re done. The different workflow states keep you focused on the task at hand, and each has a task-specific font and color.
$19.99 for iOS, $19.99 for OS X. Strikes me as very fair—and I hope sustainable—pricing. I'll be downloading and testing the iOS version when it goes on sale tomorrow.