Ive been using a plethora of health apps and have moved across many devices from Fitbit to Jawbone to my current Apple Watch. I love quantifying my data and seeing my progress. Since anaylising my data I have lost nearly 40 pounds since January of 2015. With this in mind the only piece of my data gathering ecosystem was something that looked at my weight and found trends. This app does a great job of showing all the information you need to see right away. The recent design update is gorgeous too! I highly recommend it as it has even further motivated me to continue toward my goals.
Very in depth with easy to understand charts and accurate predictions. Moving averages are so good for the days when you have natural weight spikes.
Use this app!
Viper on! about Happy Scale: Simple Weight Loss Tracker with Daily Moving Average Trend Line, v4.0