If you're looking for an alternative to Google Docs real-time collaboration, but you also need HTML output, CKEditor 5 is a go! You can use it to comment on selected parts of the content, text, images, tables or suggest edits with its track changes feature.
To collaborate with your colleagues or friends all you have to do is to share the link. Each time you load the page, a special document ID gets attached to the URL. Each document ID and its content stays active for an hour after the last user disconnects from it so you do not immediately lose your content. Also, there isn't a limit for the number of collaborators!
Collaboration makes it easier to create your content quickly and efficiently. With CKEditor 5, where you write, comment, discuss and proofread the content are unified so you don't lose time switching between applications to edit and discuss. If some of your collaborators prefer Markdown, CKEditor 5 has you covered there too!
Learn about CKEditor 5 collaboration features