It is a nice idea. I worked at a place that had an app back in 2012 and something like this (had we used Slack) would have been very useful. I haven't worked with apps for a long time but I can see it being useful.
Thanks! If you do go back to working with mobile apps in the future, don't forget to check it out :) even if the project doesn't get any customers, I don't intend to shut it down, because it's super useful to me personally, so it should be up and running for years to come ;) — assuming Google/Apple doesn't kill or sherlock it lol