That sounds fairly easy to use although I'll be honest, I'm not techy, so don't tend to use apps for stuff like this. I've seen one of those here, a friend used it and it worked fairly well for her, she got the results and, better still, learned what she should and shouldn't be eating, the quantities, along the way and has held the weight off for a few years now. 

I guess my particular background and past has taught me accountability for myself, the need to be able to set a goal and drive at it, and whilst something require a more complicated plan than others, I have been managing my diet for so many years, as a diabetic, that I generally find no trouble in knowing what to eat etc. The challenge is sometimes the will-power, but usually that too is covered. It's still difficult of course, and I can see how apps like the one you mention can be very advantageous. 

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