I primarily use Scrivener for text written in the Danish language. Unfortunately, Apple’s built-in spell checking functionality is rather poor in the Danish version. Even more unfortunately, the most efficient and professional spell checking system in my language is that of Microsoft Word. I loathe using Word, but I cannot get around using its spell checker.
Therefore: Is there any way I can open individual documents from a Scrivener project in Word, spell check them and then save them back to Scrivener?
I can wholeheartedly recommend Spell Catcher. It’s very configurable and works really well for me. Also, support is fast and thorough, should you need it.
It is possible to use alternative spell-checking dictionaries, in particular OpenOffice ones, so if the OpenOffice Danish spelling dictionary is better, you could install that. Here’s how:
Well, I found this blog post as well but it is not working on macOS because on macOS Scrivener uses the build in spell checker.
I wonder if it is possible to add the real Duden (not just the short version of the Duden provided by Apple) to the global spell checker in macOS without using additional windows on the screen?
I’ve merged your post into an existing discussion on how to install custom spelling dictionaries into macOS (you were responding to a Windows thread). Note the link to the instructions mentioned above is out of date, here is the updated location: https://scrivener.tenderapp.com/help/kb/macos/spelling-dictionary
So the main question is whether you can find the full Duden dictionary in the format that macOS requires.
Also do note that spelling word lists are not linked to the Dictionary.app utility that Apple installs with the system. Installing custom dictionaries for that require a different file format.