Beware, you can lose your work!
I bought both iOS and Mac version of the product. My intent was to use both for writing documents and syncing through iCloud. It worked OK initially, but one day I lost ALL of my documents on iPhone/iPad and Mac. A creaptic message that some .XML file is unavailable obviously didn’t help. When I reached out to the help desk they suggested to reboot computers and when this obviously didn’t help they stopped responding to my emails. Obviously a very buggy product, BEWARE YOU CON LOSE YOUR WORK!!!!!
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Ulysses – The Ultimate Writing App, v2.5.2