Does not have El Capitan Share Extension or today center widget

The iOS version of this app has a share extension so that you can quickly save web pages from safari. However the mac version does not have this.

Additionally, there is no handoff support between iOS and mac.

Finally, there is no way to open notability notebooks in iCloud Drive, google drive, etc. That means that if you want to share notebooks, you have to export to PDF

ajay.ganapathy about Notability, v2.2.0