Thanks for your words! ^^
Apostrophe also has some niceties under the hood (try to ctrl+click on images, links, latex formulas or even plain words!), a smart drag and drop handler, focus mode, word/paragraphs/read time counter... Some of those features are showcased on the web, which you may want to include in the post: https://somas.pages.gitlab.gnome.org/apostrophe/
Next release will focus on improving the exporting capabilities and I/O in general, I hope you like it.
Also, consider donating so I can keep working on it! I do it in my free time, but any help is well appreciated. Bug reports and pull requests are well received as well, and so it is any help regarding l18n