Range Freely: ECG Recorder — support, questions and bug reports.
Write to support@rangefreely.app. A real person reads it. If you're reporting a problem, the session date and your iPhone model help more than anything else.
A Polar H10, or another ECG-capable Bluetooth chest strap. The H10 is the one we develop and test against. An optical wrist sensor — including Apple Watch's — cannot produce an ECG waveform, so it won't work for what this app does.
No. The watch app is a companion for starting, stopping and marking a session from your wrist. The iPhone app is complete on its own.
On your iPhone, inside the app's own storage. There is no account and no cloud sync. A session leaves your device only when you export or share it yourself. See Privacy.
Open a session in Review and use the share button: a review PDF, or a Kubios-ready CSV — raw, or with cleaning applied. Both go through the normal iOS share sheet, so you can mail them, drop them in Files, or send them to any app you already use.
Because the reading wouldn't mean anything yet. α1 needs you warmed up — past a mid-Zone-1 heart rate, held for about three minutes, with a clean signal. It is not that you have to work hard; it is that at rest your breathing dominates the beat-to-beat signal. Until those conditions are met the app holds the number back and tells you what it's waiting for, instead of showing you something confident and wrong.
No. Recording continues and the app reconnects to the strap on its own; the gap is recorded as a gap. Your session is written to disk continuously, not held in memory until you stop.
No, and it doesn't try to. See the note below.
Email support@rangefreely.app. Feature requests are welcome and get read even when the answer is "not yet."