BS4 Retail

Visitor counting and real-time occupancy measurement


The Milan Cathedral, also known as the Duomo di Milano

Critical task

Real-time visitor occupancy counting, both inside the Cathedral and roof-top.


Dense solution by BS4 to monitor every single access of the Cathedral by counting incoming/outgoing visitors and computing real-time occupancy.


  • Better management of the Cathedral space
  • Improved visitors experience and safety
  • Less overcrowding of the area


The rich architecture of this majestic building has contributed to making it the symbol of the city. Construction began in 1386, and the final details were completed in 1965. In an era of ever-growing technological advancement, in 2015 the Cathedral took a small but valuable step towards its digital transformation by adopting BS4's solution. 

In 2019, 2,8 million people visited the Duomo di Milano, with an average of more than 7600 people per day counted by Dense solution.

The 2020 pandemic has made the BS4 solution an even more fundamental tool by safely managing people flow and sending real-time notifications to the staff, referring data about the actual occupancy both inside the Cathedral and on the roof-top.

With a monitored area of more than 11.700 m² inside the Cathedral and 8.000 m² on the roof-top and with a unique project design and deployment by BS4 specialists, the Milan Cathedral is one of the proudest installations in BS4's portfolio.

More information

For more information on this solution contact us or visit the dedicated page.