Geo Crowd Mapping is a collaborative web app where you can make your edits (red) and see other people's edits (blue) in real time.
Use Layer Swipe widget for distraction-free-mode and/or to compare your edits with other users. Public layer is on the top and your (private) layer is on the bottom.
Use trash can button to delete your edits in the current session.
Have fun!
Cheers!!!!
Robert
Try it out here.
Libraries Referenced