Happy Scale keeps it simple with monitoring your weight each day. Here’s a graph showing how my weight dropped from a year ago. All you need is the app and a scale that connects to Apple Health. I’m using a FITINDEX one from Amazon.
Another health app that I continue to use for fasting is FastBot. After eating dinner, I press the “Start Fast” button and watch the circle fill up. 16 hours later is when I eat again. It helps keep things simple and minimizes snacking, only focusing on lunch and dinner. I’m on my third day in a row of doing this.