When comparing FoldingText 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 FoldingText is ranked 36th. 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 Supports custom CSS
Pro Extensible with plugins and scripts
Pro Built-in productivity features
It has a foldable outline (like the name says), task checklists, and tags.
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 No in-app Markdown preview
You can export to PDF or HTML with formatting, but no preview in the Mac app.