What's the best fitness app?

Ideally, I'd like one app that tracks both diet and activity. I currently use MyFitnessPal to track what I'm consuming and Strava, sometimes, for my workouts.
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Myfitnesspal

Free Calorie Counter , diet and excercise journal.

Alex StearnCreating something wonderful! · Written
My fitness pal. I love it. It's amazing if you are on a diet and really helps you keep on track. Just the act of recording everything you eat helps you stay committed to your goals.
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