VIStock

- A long time ago, in the ancient Hanseatic city of Königsberg, someone came up with a wonderful device that for hundred of years helped housewives to do housework. Going to go to the market, the hostess opened her wardrobes and looked - what products were few or no. She moved the slider on this device in accordance with the stock (for example: if the flour ended, then “flour” all the way to the left). Then in the market, she looked at this device and bought what she needed. So she never forgot to buy what she needs now.
- The application does the same. You have a list of products and before going to the supermarket, you simply open your refrigerator and cabinets in the kitchen and see: which of the products you will need to buy. And move the sliders for each product to the desired position (for example: if the eggs run out, that "eggs" all the way to the left, if there is a lot of corn, then the "corn" all the way to the right, if there are half of the beans left, then the "beans" are shifted to the middle )
- Then in the supermarket you can see, for example, only “red” products (those that end and you must buy them), or only “yellow” (those that still exist, but it may be worth buying them if it’s not hard to carry all this).
- The slider of each product turns red if the stock runs out (if you move the slider less than 25% of the full stroke), green if there is a lot of it (more than 75% of the full stroke of the slider), or yellow in other cases.
- The round gray button at the top left is needed to sequentially switch the display: “all” products or only “red” or only “yellow” or only “green” or again “all” and so on. The color of this button changes according to what products you see (“all” is gray, only “red” is red, only “yellow” is yellow, only “green” is green).
- If you do not have a product in your possession, simply remove it from the list by swiping your finger from right to left.
- If you want to add the product you need, click the round button at the top left (the button with the “+” sign). Enter a name for the new product and it will be added to the list. The list is always sorted alphabetically, so a new product may be lower or higher than what is visible on the screen.
  If only “red” products are selected, the new product will also be “red” (the same for “yellow” and “green”). If "all" products are selected, a new one will appear in green.
- It is convenient in the supermarket to turn on the display of all the "red" products and walk with the cart from shelf to shelf. It is convenient to immediately shift each product put into the basket right (from "red" to "green"), so you will see what has already been bought and what remains to be bought.
- On an old German device you can see “kerosene”, “matches” and even “shoe polish”. Do the same and add to the list everything you need, not only food stocks.