Question 1

Why does it take thirty seconds?

Accepted Answer

A rate needs beats to count, and variability needs the gaps between them. Thirty seconds gives roughly thirty beats, which is enough for both to settle. A shorter reading would be quicker and less true, and there is no point in a number you cannot rely on.

Question 2

What does "the spacing between your beats varied more than usual" mean?

Accepted Answer

Exactly and only what it says. HeartGlance noticed that the gaps between your beats during that reading were less even than they usually are. That happens for many ordinary reasons — moving, talking, a cold finger, an unsteady grip on the phone. It is not a diagnosis, and HeartGlance is not able to make one. If you see it often, it is worth mentioning to your doctor, who can order the test that would actually answer the question.

Question 3

What is heart rate variability, and why is mine low?

Accepted Answer

It is the small variation in the gap between beats, in milliseconds. More variation generally reflects a body that is well rested and adapting easily; less can follow poor sleep, illness, alcohol, or stress. It falls with age, which is why HeartGlance compares you with people your own age rather than with athletes. A single low reading means very little. A trend over weeks means more.

Question 4

Where do the "typical" ranges come from?

Accepted Answer

Resting heart rate percentiles come from NHANES 1999–2008, a US national health survey. Heart rate variability comes from the Lifelines cohort published in 2020. Blood pressure categories are the American Heart Association's. All three are cited inside the app and on the doctor's report, so a clinician can check them.

Question 5

Can HeartGlance measure blood pressure or oxygen from the camera?

Accepted Answer

No, and it does not claim to. Blood pressure, blood oxygen and body temperature are entered by you or read from a paired device or your phone's health store. Heart rate is the one thing the camera measures. Any phone app claiming to measure blood pressure from a camera alone should be treated with suspicion.

Question 6

Can it detect atrial fibrillation?

Accepted Answer

No. Detecting a rhythm disorder is a regulated medical claim that requires clearance HeartGlance does not have and does not pretend to have. It will tell you when the beat spacing looked unusually varied, as an observation about the signal, and it will point you at your doctor. That is the honest limit of what a phone camera can support.

Question 7

What do I get without paying?

Accepted Answer

Unlimited readings, forever, with no account, and the last 30 days to look back over. This week's trend. Blood pressure, oxygen, temperature and weight logging, and how you felt on each reading. A daily reminder. The doctor's report on screen. Apple Health and Health Connect sync. Nothing you record is ever taken away from you, including if a subscription lapses: a free account keeps every reading it has ever taken, and the whole lot is still in the export.

Question 8

How do I cancel?

Accepted Answer

Subscriptions are held by the store, so cancelling happens there. On iPhone: Settings → your name → Subscriptions → HeartGlance. On Android: Play Store → your profile → Payments and subscriptions → Subscriptions. The Subscription screen inside the app links straight to the right page. Cancelling stops the renewal; premium keeps working until the period you have paid for ends.

Question 9

I canceled during the trial. Will I be charged?

Accepted Answer

No. Cancel before the third day ends and nothing is taken. The app also reminds you the day before a trial ends, so it cannot roll over unnoticed.

Question 10

Do I get a new phone's readings back?

Accepted Answer

If Apple Health or Health Connect sync is on, your heart rate readings live in your phone's health store as well, and that comes across with a normal device transfer or backup. Turn sync on before you move if you want that. Cloud sync between devices is planned but is not in this version, and we would rather say so than imply otherwise.

Question 11

How do I delete everything?

Accepted Answer

Delete the app and everything on the phone goes with it. If you turned on backup and sync, Me › Privacy and Data › Delete my account erases the copy in your account at the same time; signing out only forgets the account and leaves every reading where it is. If you turned on health sync, readings already written to Apple Health or Health Connect are yours to remove there, in those apps.

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