Sundays offers personalized feeding instructions.
Most traditional dog food companies' instructions recommend too much food, because they're incentivized for you to go back to the store and buy big bags. The calorie recommendations often make unrealistic assumptions like that the dog isn't eating anything else (e.g. like treats) and that they're proper weight — when over 70% of US dogs are overweight or obese.
Sundays' vet-designed algorithm assumes that you're pup might be getting other calories (in the form of some treats or scraps), and that they may be on the high-end of their healthy weight range — while 70% of dogs are overweight or obese, very dog parents will self-report this, understandably :)