“Google Docs allows real-time collaboration with editors, beta readers, and fellow writers
If you’re working on a collaboration, Google Docs is one of the best… Multiple writers can work on the same document at the same time.
Let’s say you want to get feedback on your writing from a critique partner or a beta reader. If you invite them to your Google Docs file, you can watch as they leave comments, in-line edit suggestions, and even emoji reactions on specific passages of your work.” – ProWritingAid
Google Docs also lets you set the permission level of every person you grant access to! Best of all, it’s totally free.
Try out Google Docs at docs https://docs.google.com!