The "perfect" solution exists it was developed by Toyota and adjusted for groceries by this guy: https://www.heitmanagement.com/blog/2014/09/kanban-for-grocerie

The "perfect" solution exists it was developed by Toyota and adjusted for groceries by this guy: https://www.heitmanagement.com/blog/2014/09/kanban-for-groceries/ https://www.heitmanagement.com/blog/2014/09/kanban-for-groce... And it involves no apps nor lists.