When comparing Write for Mac vs Letterspace, the Slant community recommends Letterspace for most people. In the question“What are the best Markdown editors for OS X?” Letterspace is ranked 32nd while Write for Mac is ranked 42nd. The most important reason people chose Letterspace is:
This was a iOS first app and that is clear. Great swipe bar interface on iOS.
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Pros
Pro Clean. Beautiful. Distraction Free.
Pro Synchronizes with iCloud and Dropbox
Can be synchronized with iCloud and Dropbox.
Pro Great UI
Pro Full featured iOS app
This was a iOS first app and that is clear. Great swipe bar interface on iOS.
Pro Simple, yet powerful interface
Keyboard shortcuts for basic text formatting. A few theme options. Full screen mode and swipe gestures.
Pro @mentions and #tags for easy organization
Pro Advanced Markdown support
Features Markdown support that many other text editors don't; such as Todo's ( -[x] ) and Strikethrough.
Cons
Con Attempting to download it results in an error, webmaster e-mail is dead
This app may not be maintained anymore. The download attempt from its site failed and so did an attempt to report it to the webmaster.
Con Crashes with keystrokes managers like Typinator
Con No in-app Markdown preview
You can export to PDF or HTML with formatting, but no preview in the Mac app.