Fix the quantity entry issues and this will be a killer application. For example, my morning bulletproof coffee is 11.60 oz., however the default volume is 8 fl. oz. I am unable to either modify the quantity - 1.45 servings - or the volume - 11.6 fl. oz. This makes the functionality of the app extremely limited.
I like that it gives you the actionable timeline of when you should be able to sleep well after consuming caffeine.
The ability to input products is VERY limited. You can't modify serving volume or quantity.