Noom is an all-in-one "health and wellness" app that matches you to a coach. They ask you tons of questions to start with, like what your goals are and stuff, then the app explains to you why you're doing what you're doing (whether it be exercise or nutrition or a mix of both) and you get to look up food in their database, which gets color-coded based on caloric density. You then log your meals and your weight to track your caloric budget and your weight loss.
You get to chat with your (real, not AI) coach about once a week from what I gather. I haven't reached that stage yet.
A lot of it is common sense stuff but the way it teaches you basic psychology and your body's mechanisms is really well done. I still have to decide whether I wanna pay 160 bucks every 6 months to keep using it. Seems steep but it keeps you engaged and committed to your goals. I like it quite a bit.