Multiple Access Counter app for iPhone and iPad

In special times, the authorities issue various rules and laws, which also define how many people can be present at the same time in a shop, restaurant, etc. Violation of these regulations are often punished with a penalty.
One device, iPhone or iPad, is required for each entry/exit to the shop, restaurant etc. The devices are connected via a peer-to-peer WLAN network.
This summarizes the individual registered entrances and exits and enables the control of the total number of current visitors.
There is a warning, on each device, issued when the permitted number of visitors has been reached or exceeded.