Questions and bug reports for Range Freely apps.
Write to support@rangefreely.app. A real person reads it. Please do not send recordings or personal metrics of any kind. They will be deleted as we have no means of storing them securely. If you need help with using the app, please put your issue into writing. Thanks.
Training and general wellness: recording your heart's electrical signal and beat-to-beat timing from a chest strap, and showing measures such as heart-rate variability and DFA α1 while you exercise.
A chest strap. We recommend the Polar H10: it is what we develop and test with, its beat-to-beat (R-R) intervals have been checked against ECG in published studies, and it also streams the ECG itself, so it shows an ECG trace alongside DFA α1 and HRV. A strap that reports only beat-to-beat intervals should give DFA α1 and HRV but no ECG trace. Optical wrist sensors, including an Apple Watch's, cannot give the beat-to-beat precision these measures need.
A number calculated from the timing between your heartbeats, used in exercise research to follow effort. What it is, when it is valid and how to find where it sits for you are on the DFA α1 page.
Not necessarily; individual results vary. The DFA α1 page explains what the research does and does not say.
A word beside the number, such as Settling, Held or Stable, says how far to trust it. Each one is explained on the DFA α1 page.
On your device only. There is no account and no cloud sync, and we cannot see your recordings. A session leaves your device only when you export or share it. See Privacy.
DFA α1 is always free. Some recordings and HRV readings are free to try. An optional yearly subscription, bought through the App Store, unlocks the rest. Prices are shown in the app and on the App Store in your own currency.
No. Range Freely apps are training and general-wellness tools, not medical devices. They do not diagnose, treat, or screen for any condition, and nothing they show is a medical assessment. If you think you may be having a medical emergency, call your local emergency number. More on what that means.
Email support@rangefreely.app. Your iPhone model helps most.
Range Freely: ECG Recorder FAQ
Email support@rangefreely.app. Feature requests are welcome and get read even when the answer is "not yet."