This is a great app for tracking energy fluctuations throughout the day - whether or not you’re experiencing medical difficulties. I began using this app after a surgery temporarily depleted my energy and I discovered that it’s also useful for knowing what times of day you are working at your peak. This has been helpful for me to schedule exercise and work tasks at times of day when I have the most energy to tackle them. It’s great! However, it really needs better visualization features. It’s easy to see how your day went, but knowing on average whether you’re more energized in the morning or evening would be really helpful (again, whether or not you’re dealing with illness). Also seeing a line graph of weekly or monthly changes would be helpful. There’s a great feature that allows you to enter what went well and poorly each day, so you can track whether your energy challenges are influencing sleep or productivity, for example. I also wish this feature saved the factors you entered so you can select them again later. As it stands, you have to write the exact same thing each time or it will be counted as separate variables (eg “exercise” and “exercised” are treated as separate variables). To summarize, great app! Needs time-of-day, line graphs, and added variables list. I personally recommend and will keep using. Hopefully the developers continue to improve the design! Fingers crossed!