JointSignal: RA Tracker

An honest record of how you have actually been. A minute a day adds up to a picture nobody can reconstruct from memory in a fifteen-minute appointment. JointSignal turns your daily check-in into a report worth handing your rheumatologist. THE ONE RULE The app never fills in a blank for you. A question you skip stays unanswered — it never quietly becomes a zero, and a day you missed never appears on a chart as a good day. A report is only useful to a clinician if everything on it is something you actually said. WHAT IT TRACKS • The daily check-in — pain, overall status, fatigue, sleep and mood, each a single tap on a 0–10 scale, and morning stiffness in minutes. Flare days get a switch. Under a minute, by design. • The 28-joint count — every joint your rheumatologist scores, plus the neck and both feet, including the finger joints. Tap targets built for hands with active RA. • Apple Health, read-only — steps, walking speed, stair speed, sleep, heart rate and blood pressure sit directly under what you reported, on one shared time axis. The app requests no write access and never alters your Health record. • A calendar you can read at a glance — every day coloured by how bad it was, flare days marked, and gaps shown as gaps. • Medicines and adherence — dose by dose, with changes marked on every chart. A dose you never answered is excluded from the percentage, not counted as missed. • Side effects, bloods and appointments — with reference ranges, and reminders so a blood draw is never missed before a review. • Questions for your specialist — saved as they occur to you, then worked through in a view built for large type and one hand. • The weather, if you want it — temperature, humidity and air pressure under your pain score. The app shows both and draws no conclusion. • Your data, yours — export it as CSV or JSON, for a spreadsheet or an AI assistant. Blanks stay blank. • Backups that happen without you — one a day to your own iCloud Drive, thirty kept. THE REPORT Two or three pages of black ink on white paper: coverage, trends, joint counts, adherence, blood results with reference ranges, flare days and your notes. Every figure traceable to something you entered. Export it as a PDF and send it however you like. PRIVACY No account. No server. No analytics, no tracking, no third-party code of any kind. Your record lives on your phone, and your backups go to your own iCloud Drive. The developer never receives your health information — the app contains no code capable of sending it. Weather is optional and off by default. Switched on, it sends your approximate location — never anything you recorded — to Apple's weather service, and does not store it. WHAT IT IS NOT JointSignal does not diagnose anything and it is not medical advice. It records what you tell it and shows you the patterns. Your rheumatologist does the rest. DAS28 is calculated from joint counts you enter yourself, and is labelled self-reported everywhere it appears — it is not a substitute for your rheumatologist examining your joints. Never delay seeking medical attention because of something this app did or did not show you. WHY IT EXISTS I'm Scott. I have rheumatoid arthritis. I went looking for an app that would let me track it properly and could not find one — the apps I tried covered several conditions passably rather than one condition well, and none of them read Apple Health. So I wrote this one for myself, and then thought other people living with RA might want it too. SUBSCRIPTION JointSignal is free to download, and recording is free for your first 7 days with nothing to sign up for. After that, recording new days needs a subscription. A lapse never removes what you recorded — reading, the charts, the calendar, the report and every export stay yours. Terms of Use: https://jointsignal.app/terms Apple's standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://jointsignal.app/privacy