Coach Darcy Ellis explains which mobile apps are most effective when counting calories from his experience.

IOS - MyFitnessPal:
https://apps.apple.com/us/app/myfitnesspal/id341232718

IOS - Easy Diet Diary:
https://apps.apple.com/au/app/easy-diet-diary/id436104108

Android - MyFitnessPal:
https://play.google.com/store/apps/details?id=com.myfitnesspal.android&hl=en_AU&gl=US

Android - Easy Diet Diary:
https://play.google.com/store/apps/details?id=au.com.xyris.eddflutter&hl=en_AU&gl=US