Everyone I know who's done a calorie controlled diet has spent part of it in misery.
Think it's the brains response to a drop in available energy.
Agree with the misery but I don't think it has anything to do with energy.
I decided to ease up with calories 3 months ago but never considered tracking calories. Can't imagine what a pain that would be. I'm doing what I'm doing for myself and not to satisfy an app.
They say you need to do something for 10,000 hours to achieve mastery. Even if you take into account just your adult life, you're in a position where you've spent far more than that eating. You know how your body reacts to different foods and at the end of the day: You know what got you where you are now. You don't need a dietician to tell you that your salmon will be less caloric with a baked potato then chips.
That said, knowing is one thing, doing it is another. If you really want an app to support you - get one that will focus on the emotional side of dieting rather then just the mathematical aspect.