If you live with chronic illness you already know spoon theory. Every task costs something, and some days you start with almost nothing. Most health apps don't get that, and they ask for the most on the days you have the least.
So Health Flare is built around a few rules.
A missed day is a gap, not a zero. If you couldn't log, the chart shows nothing for that day. A day you were too sick to log never shows up as a good day.
The minimum counts. A check-in can be a single number: how you are today, 1 to 10. Stress, sleep and the rest are optional. Forgot yesterday? Log it today.
Flares are one button. Start a flare when it starts. Everything you log until it ends is tagged to it, so later you can see what a flare actually looked like.
Appointments are short, so prep ahead. Add your questions to the appointment in the app and tick them off in the room. Take a PDF report of the last 30 days instead of trying to remember them.
No account, no analytics, no server of ours. Nothing to sign up for, and no one to explain yourself to.
I built it as a caregiver. Between a full time job and caring for family, most days leave very little energy for the extra work of keeping notes. Without Health Flare those notes would be sporadic, if they existed at all. Because logging takes so little, I actually do it, and that has made a real difference.
It's free and open source, on Android and iOS: healthflare.org.