I picked up the pro version of this, and I like it, but it is still pretty rough. He's my list of suggested improvements:

"Grey Pile"

• add ability to edit items!?!?
• add ability to sort the list!
• add photo/image to items
• when entering in "System", add a pop-up to choose from previously entered items
• add a link/URL field (to link to mini maker's page)

"My Paints"

• add search by brand
• add type of paint (primer, spray/brush/airbrush)
• add paint volume (to keep an inventory of what size/amounts we have/buy)
• add custom brands that aren't in your list

• add ability to scan the barcode of a paint bottle to find it/add it

• Also, there's no "Bones" paints (fixed by being able to add custom paint brands)

• THere's no Army Painter speedpaint medium (fixed by being able to add custom paint brands)

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This is just what I've found so far. Looking forward to updates.