Pros:
I recently hunted a similar app but it didn't include cosmetics ... so this is definitely an improvement.
People can use this at the store to not buy eye shadows that are tested on animals.
Tells you if ingredient is animal-derived, vegan or vegetarian, gives you an explanation ... very educational!

Cons:
This is going to slow down shopping 3x if you try to scan everything first to make sure it's environmentally and animal friendly