500,000+ ECGs read by our technicians

Not sure what your ECG means?

Upload the ECG PDF from your watch or device. A certified cardiographic technician reads it and emails you a clear answer within minutes.

  • $4.99 one-time
  • Result within minutes
  • No app or account
Works withApple WatchFitbitSamsung Galaxy WatchWithingsKardiaMobileand other ECG devices
An Apple Watch showing an ECG result that says InconclusiveYour watch: InconclusiveInconclusive
ECG reviewAn example
Sinus RhythmNormal
Premature Atrial ContractionsModerate
“Your rhythm is normal, with a few early beats. They're likely why your watch couldn't classify it.”

How it works

  1. Upload your ECG

    Export the PDF from your Apple Watch, Fitbit, Samsung, Withings or KardiaMobile, and tell us how you felt.

    How to export your ECG as a PDF

  2. Pay once

    One review costs $4.99. You pay securely on Stripe's checkout page; there's no subscription.

  3. Get your reviewWithin minutes

    A certified cardiographic technician reads it within minutes. We email you a private link to your result.

    See an example review

What you get

Your ECG, explained in plain words

This is an example of the review you get back. Save it as a PDF or share it with your doctor.

  1. The rhythm, named and graded

    Your recording is checked for 33 abnormal rhythms. Each one found is graded Normal, Mild, Moderate or Urgent.

  2. A message written to you

    Your technician explains what it means and what to do next. If the recording can't be read, you're told how to record a clearer one.

  3. Your measurements

    Heart rate and the PR, QRS and QTc intervals, each compared with its usual range.

  4. Extra beats, counted

    Early beats from the upper chambers (PACs) and the lower chambers (PVCs).

Upload your ECG$4.99
An example
Qaly

ECG review

Single-lead ECG reviewed by a certified cardiographic technician

Reviewed
November 3, 2026

Rhythms found

  • Sinus Rhythm

    Normal

    Sinus rhythm typically does not require any additional clinical attention.

    Qaly

    Sinus Rhythm

    Normal

    Definition

    Sinus rhythm occurs when the normal command center (the sinus node) located at the top of the heart sends an electrical signal to the rest of the heart, telling it to beat in a regular manner. The sinus node is controlled by many things, including activity, sleep and emotional state. Normal sinus rhythm is defined as a heart rate between 60 to 100 beats per minute although this can vary throughout the day and from person to person.

    ECG feature

    During contraction of the top chamber (the atrium) of the heart, there is a smooth upright bump called the "P-wave". This is then followed by the contraction of the bottom chamber (the ventricle) resulting in a larger, jagged wave called the "QRS complex". Typically, there is one P-wave for every QRS complex.

    Cause

    Sinus Rhythm is the normal state.

    Next step

    Sinus rhythm typically does not require any additional clinical attention.

  • Premature Atrial Contractions

    Moderate

    Those showing signs of two or more PACs during a 30 second period may have frequent PACs and should see their health care provider as soon as possible for a more accurate measurement of daily PAC counts and medical consultation.

    Qaly

    Premature Atrial Contractions

    Moderate

    Definition

    A premature atrial contraction (PAC) occurs when an extra heart beat originates at the top of the heart (atrium). These extra signals usually, but not always, make their way down to the bottom of the heart. This can often cause someone to feel an extra or a “skipped” beat, though many of these beats are asymptomatic. Nearly everyone experiences a few PACs every day, but frequent PACs have been linked to conditions such as atrial fibrillation.

    ECG feature

    The PACs are typically identified by a “p-wave” that is observed before the next normal heart beat is expected. The premature p-wave can look normal, but is usually shaped a bit differently. Most of these beats are followed by a normal looking QRS complex, although PACs that are very early may not be able to send a signal to the bottom of the heart. Frequent PACs can be difficult to distinguish from sinus arrhythmia [link to sinus arrhythmia], which is more commonly found in young healthy people. A 12-lead electrocardiogram could further help distinguish between these two.

    Cause

    A few PACs per day are completely normal. However, frequent PACs can be caused by stretching and scarring of the top chambers (atria) which lead to electrical disturbances. Factors that can contribute to frequent PACs include high blood pressure, diabetes, obesity and several underlying conditions such as heart failure and thyroid disease.

    Next step

    Those showing signs of two or more PACs during a 30 second period may have frequent PACs and should see their health care provider as soon as possible for a more accurate measurement of daily PAC counts and medical consultation.

Your rhythm is normal, with a few early beats. They're likely why your watch couldn't classify it.

Qaly technicianCertified cardiographic technician

Measurements

Heart rate72bpmIn usual range
PR interval164msIn usual range
Qaly

PR duration (milliseconds)

Everything seems normal

What does this mean?

The PR interval is considered normal between 120ms and 200ms.

Image: PR interval in blue
What is PR?

The heart behaves like a pump, which requires an electrical signal to be sent from the top of the heart all the way down to the bottom. The PR duration is the amount of time it takes for this electrical signal to go from the sinus node, which is like the “command center” of the heart, and the ventricles, or bottom chambers of the heart. The electrical signal has to travel through the top chamber (atrium), then through the AV node, which is the gatekeeper of the electrical signal, and then down specialized electrical wiring called the His-Purkinje system, until it finally gets to the ventricles. The PR interval is measured from the beginning of the P-wave, to the beginning of the QRS complex.

QRS duration92msIn usual range
Qaly

QRS duration (milliseconds)

Everything seems normal

What does this mean?

The QRS interval is considered normal up to 120ms.

Image: QRS complex in blue
What is QRS?

The heart has its own electrical system that controls each heart beat. When an electrical signal from the top part of the heart makes its way down to the bottom part of the heart (the ventricles), it then has to spread throughout the entire ventricle for it to contract, or squeeze, at the same time. There are specialized wires in the bottom of the heart (the right and left bundle branches, or the His-Purkinje system) that help spread this electrical signal as evenly as possible. The QRS duration is measured from the beginning of the QRS complex to the end of the QRS complex.

QTc interval412msIn usual range
Qaly

QTc duration (milliseconds)

Everything seems normal

What does this mean?

The QTc interval is considered normal between 350ms and 450ms for men, and between 350ms and 470ms for women.

Image: QT interval in blue
What is QTc?

When an electrical signal travels throughout the heart, the electrical state of the heart cells is changed. The heart then has to “reset” itself and change the heart cells back into its normal state to get ready for the next heartbeat. The amount of time it takes for the electrical signal to travel through the bottom of the heart and then “reset” itself is the QT interval. We expect this to happen more quickly when the heart beats faster, which is why we need to correct for the heart rate using a simple mathematical equation. This is what the “c” stands for in QTc. The QT interval is measured from the beginning of the QRS complex to the end of the T-wave. The QRS represents the ventricles contracting, and the T-wave represents the ventricles electrically “resetting.”

P wave━Couldn't be measured

Extra beats in this recording

PACs2Premature atrial contractions
Qaly

Premature atrial contractions (PACs)

2 in this recording

What is a PAC?

A premature atrial contraction (PAC) occurs when an extra heart beat originates at the top of the heart (atrium). These extra signals usually, but not always, make their way down to the bottom of the heart. This can often cause someone to feel an extra or a “skipped” beat, though many of these beats are asymptomatic. Nearly everyone experiences a few PACs every day, but frequent PACs have been linked to conditions such as atrial fibrillation.

PVCs0Premature ventricular contractions
Qaly

Premature ventricular contractions (PVCs)

0 in this recording

What is a PVC?

A premature ventricular contraction (PVC) occurs when an extra heart beat originates at the bottom of the heart (ventricle). This can often cause someone to feel an extra or a “skipped” beat, though many of these beats are asymptomatic. Nearly everyone experiences a few PVCs every day, but frequent PVCs have been linked to other heart problems.

Your original ECGThe PDF you uploaded

This review was made by a certified cardiographic technician from the single recording you sent. It is not a diagnosis. Share it with your doctor, especially if you have symptoms. If you feel unwell now, call 911 or your local emergency number.

Qaly does not practice medicine or provide medical services. The Qaly application and service is only for general informational and educational purposes and is in no way intended to, or be relied upon to replace or constitute professional medical care or attention by a qualified healthcare provider. The information about health provided by the Qaly application and service is not intended to diagnose, treat, cure or prevent disease. IF YOU THINK YOU HAVE A MEDICAL EMERGENCY, CALL YOUR DOCTOR OR 911 IMMEDIATELY. Learn more: qaly.co/clinicians

The answer people were waiting for

Qaly's certified cardiographic technicians have read more than 500,000 ECGs. These are reviews of the Qaly app from the App Store and Google Play; the same technicians read the ECGs you upload here.

★★★★★

Glad i signed up

By Enaid1111

My fitbit ecg said normal sinus rhythm but the tracing looked odd and i felt jittery. I signed up and sent the report. A few minutes later i received a reply explaining that, even tho it looked a little weird, all of the important info indicated normal sinus rhythm and i was fine. I cannot describe the relief.

★★★★★

By Marc

I was sitting up late one night worrying about my heart rhythm. I downloaded the app, signed up, and uploaded an ECG taken from my Galaxy Watch. Within 5 minutes I received knowledgeable, friendly, and reassuring professional feedback.

★★★★★

Great app!

By LMichaelD

During a recent hospital stay for monitoring of new Tikosyn medication I used Qaly to read an ECG I did on my Apple Watch. The nurse was impressed with the Qaly results, specifically with the QTc values since the Tikosyn directly impacts that.

Co-founded by a Stanford cardiac electrophysiologist. Dr. Marco Perez is an Associate Professor of Medicine at Stanford and was co-principal investigator of the Apple Heart Study.

Get your ECG read today

  • $4.99, one timeNo subscription, and nothing to cancel.
  • Your result within minutesRead by a certified cardiographic technician, day or night.
  • No app or accountWe email you a private link to your review.
  • Yours to keepSave it as a PDF or share it with your doctor.

A review is not a diagnosis. Share the result with your doctor if you're worried.

Step 1 of 3

Upload your ECG

The PDF you exported from your watch or ECG device. One ECG, up to 10 MB.

Not for emergencies. If you have chest pain, fainting, severe shortness of breath or feel very unwell, call 911 or your local emergency number now.

Frequently Asked Questions

How do I get my ECG as a PDF?

Apple Watch: on your iPhone, open the Health app and tap Browse, then Heart, then Electrocardiograms (ECG). Tap the recording you want, then tap “Export a PDF for Your Doctor” and save it to Files.

For other devices, our step-by-step guides show where the export option is: Samsung Galaxy Watch, Fitbit (Google Health), Withings, KardiaMobile and Wellue.

Who reads my ECG?

A certified cardiographic technician: a health professional trained to read heart rhythms from ECGs. Every technician at Qaly has passed the CCT exam from Cardiovascular Credentialing International, and together they have read more than 500,000 ECGs.

How long does it take?

Technicians read ECGs day or night, and most reviews arrive within minutes. We email you a private link as soon as yours is ready.

What will my review tell me?

The rhythms your technician found, checked against 33 abnormal rhythms and graded from Normal to Urgent; your heart rate and PR, QRS and QTc intervals compared with their usual ranges; a count of any extra beats (PACs and PVCs); and a message from your technician, in plain words, about what it means and what to do next.

Is this a diagnosis?

No. A review tells you what a certified technician sees in the single recording you sent. It is not a diagnosis and doesn’t replace your doctor. You can save your review as a PDF and take it to your appointment.

What if my recording can’t be read?

Some recordings are too noisy to read, usually because of movement. If that happens, your technician tells you so and explains how to record a clearer one.

Do I need the app, an account or a subscription?

No. One review costs $4.99, paid once on Stripe’s secure checkout page; Qaly never sees your card details. There is no app to install and no account to create: your result opens from the private link we email you.

Still have a question?

Feel free to reach out at support@qaly.co.

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Upload your ECG$4.99

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