MonsterWriter - The most enjoyable way to write a thesis, note, or blog post

The most enjoyable way to write a thesis, paper, article, or blog post.

You can download MonsterWriter from the official website: 

https://www.monsterwriter.app/

To upgrade to the pro version, you have to start the app, and open or create a document. Export the document as PDF and click on the upgrade button in the export dialog.