I don't know which frameworks do real time multi-user updates but that's a feature of many of Google's apps I would miss if it wasn't there.

I have Keep open on my laptop, my work desktop, my phone, and sometimes my tablet. If I edit on one the edits show up everywhere else without refreshing which is important because I might be sitting at my desk, type a few things into a list, walk down the hall, get out my phone, add a few more things.

Maybe people can suggest which frameworks handle that for you vs which ones you'd have to role your own solution.