Mensa is an app for finding and accessing information about Aachen's canteen. 

The app includes everything you need to know about the canteen, such as the address, phone number, opening times, etc. It is a very good idea to use the link to the route in the app to find the shortest route to the canteen.

After finding the canteen you want to visit, you can check out the menu, find the products, and see the prices. You can also find more information about the products, such as allergens, ingredients, etc. You can see what is available for breakfast, lunch, and dinner. You can also check out the weekly menu.