MacroPro

1. Add a food entering the nutritional information from the label, when you save it will adjust the quantities to equate to 100 calories worth of the food you are saving.

2. View the main table view and sort descending by protein (default)

3. All the foods shown are adjusted in quantity to equate to 100 calories.

So using the screenshot as an example, if you eat 100 calories worth of tuna steak, you get 21.4 grams of protein, whereas if you ate 100 calories worth of salmon you get only 10. 

And to answer the question of the two Oikos yogurts, while you do get more protein from a pot of Oikos Pro, the extra calories mean that on a protein per calorie basis you're actually better off with the Triple 0 one (17 grams of protein per 100 calories consumed vs 14).

Features coming soon...

If people find the most basic version of this app useful I'm considering the following features (feel free to contact me if you have suggestions or want to request a specific feature):

• Arbitrary adjustment of proportions (i.e. be able to adjust the common amount of calories so it doesn't have to be 100 - all other foods in the table would update also so you would still be comparing on an equal footing). This could extend to letting you adjust grams of protein - then each food would adjust to the same amount of grams and the other fields would adjust (including calories)

• Search/barcode scan for foods from online database (similar to how MyFitnessPal operates)