When comparing The Archive vs Letterspace, the Slant community recommends Letterspace for most people. In the question“What is the best note taking app for Mac?” Letterspace is ranked 22nd while The Archive is ranked 28th. 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 Image display
Pictures are shown inside the editor, no need for a preview.
Pro Plain text
Markdown files.
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 Mac only
Con No in-app Markdown preview
You can export to PDF or HTML with formatting, but no preview in the Mac app.