When comparing Polynote 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 Polynote is ranked 30th. 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 Real-time collaborative
Multiple users can edit a note simultaneously, in real time.
Pro Minimal interface
The application is simple and fast. Can create, share and organize notes and notebooks on the same page.
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 free tier
Plynote has a 15-day free trial after which it requires a 20$/user/year subscription.
Con No in-app Markdown preview
You can export to PDF or HTML with formatting, but no preview in the Mac app.