In my experience, most people who are overweight, have specific habits in their diet, personal to them which are causing the weight gain. It can be as simple, (I'm not saying easy), as identifying what your specific issues are and changing those particular habits. For instance, one of the things for me was that I got lazy/haphazard with taking my lunch to work, but if I went out to get something, I couldn't just buy a sandwich, I'd come out of Morrisons with a meal deal including a millionaire shortbread and an extra steak pie. Just by being more vigilant in taking my own lunch made a massive difference without apps and counting anything. Just identifying my own weaknesses and addressing them.