It definitely looks like this app has tons of potential. I would recommend making more user-friendly interface, have an ability to add pictures/images to new categories and foremost integrate a shopping list. This app has great elements : variety of units, overal preparedness, quite accurate bar scanner, tons of categories and ability to edit them. If this app would get updated with earlier listed suggestions, I would not mind paying for it up to $5 (which I did for Prep & Pantry full version).
To DEV: Looks like a lot of work has been put in to this up, and with few tweaks you can make you time worth the money. I will check back on this app in few months and hopefully see new additions (even if there is extra cost)
fYuriYos Guy about Home Food Storage, v2.51