This app is very easy to use. If you want to design a terminal box based on the Quintex box sizes, just input your different types, sizes and quantities of needed terminals. Then define your needed size, type and quantity of glands, as well as the enclosure side where to mount the glands and let the App search for the right size of the Quintex enclosure. If you need additional accessories(mounting plate, earth stud...) or Express delivery you can toogle to the accessories with the 2nd button left. You will see all accessories. Check them or choose the amount for earth tags if needed. After this toogle back to the glands input. Now you can start the search for the right enclosure. This will open a window where you see the proper enclosure, all your inputs and the price of your design.You will see the best size that fits your input. If there is no proper enclosure size for your input you will see a warning. If you want to order you can send this configuration with the 'Send' button. There you can also add some comment (e.g. tags of terminal, bridges for terminals etc..)
If you use an Android version < 4.2 you can download another version on download page:
https://goo.gl/sQhq36