Recs.
Updated
SpecsUpdate
Pros
Pro Highly customizable
A few themes are baked in and a big selection of user-contributed styles to choose from are available on the Ulysses Style Exchange.
Pro Great tools for organizing and finding files
Ulysses saves everything in the app so there's no file management outside of the editor involved. It organizes content in groups (folders) and sheets (files), has a powerful, easy to use search and allows adding keywords to attachments to help them be organized and found quickly.
Groups can have an unlimited amount of subgroups and the title of subgroup shows up in the pane view. Sheets can be split up, merged, glued together and easily moved around in the sheet pane by dragging and dropping. Great for splitting up larger documents into manageable chunks while still keeping an overview of the whole project and having the ability to move sections around quickly.
Contents of a group can be filtered by text, keywords or change date within headings, code blocks, images or any other marked up text. Filters can contain a combination of conditions and be saved to make a new group. Saved filters can be moved around to different groups and will return filtered results for that group. Selecting multiple groups will show the combined sheets of those groups.
Pro Displays statistics including how long it takes to read the document
The editor tracks statistics that shows how many characters, words, sentences, paragraphs, and pages a document contains and estimated reading time for slow, average, and fast readers. The statistics display in a popover that can be torn-off so it's constantly visible.
Cons
Con iOS and Mac versions have to be bought separately
The iOS version costs $24.99 and the macOS version costs $44.99. They have to be bought separately in order to be used on those devices.
Con No proper right-to-left support in PDF
Ulysses lacks right-to-left support that was available in the previous incarnation of this software.