Comparison

Qaly | ECG Reader vs Visible

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Qaly | ECG Reader

Get your ECGs analyzed by certified experts within minutes for peace of mind. This app supports various devices like Apple Watch and Fitbit, offering detailed interpretations of palpitations and abnormal heart rhythms. Track heart rate variability to monitor stress and recovery.

Highlights
  • Expert ECG interpretation
  • Supports Apple Watch, Fitbit, Kardia, and more
  • Analysis of 30+ heart rhythms
  • Heart rate variability (HRV) tracking
  • Shareable reports for doctors
  • Integration with Health app
Features
Read full description

Heart feels off? Inconclusive ECG? Get your ECGs read by certified experts within minutes, for peace of mind. 500,000+ ECGs read so far. Qaly is the leading ECG app for Apple Watch, Fitbit, Kardia, and other devices. On the Qaly app, get your ECGs reviewed by certified cardiographic technicians, trained to read ECGs for 30+ palpitations and abnormal heart rhythms like Afib, SVT, PVC, PAC, short or prolonged PR interval, short or long QT interval, WPW, and more. Track your heart rate variability (HRV) to monitor stress and recovery. The Qaly app (formerly ReadMyECG) is built by Stanford cardiologists and engineers, including Dr. Marco Perez, a Stanford Associate Professor of Medicine and Stanford Cardiac Electrophysiologist. Join 200K+ heart heroes signed-up with the Qaly app today, the only app where human experts analyze and interpret ECGs from your Apple Watch, Fitbit Watch, Withings Watch, KardiaMobile, WHOOP, Garmin or any other device within minutes, day or night. ---- Qaly members stay heart healthy: “I would like to thank everyone reading the ECGs on Qaly. Because of Qaly, I went to my doctor and was diagnosed with SVT and was told it was probably never an anxiety disorder. I have lived 15 years of hell thinking I was having intermittent panic attacks and agoraphobia. Getting set up for an ablation. I will be forever grateful.” — Marcie D. from Alabama “Qaly was so helpful in quickly identifying signs of a potentially serious heart condition … Without Qaly, I would have blown off the ECG and maybe shown it to my primary care doctor at my next appointment a few months away.” — Lori B. from Virginia “My Apple Watch categorizes my arrhythmia as normal or inconclusive, which makes me question what I’m feeling. Without Qaly, it would’ve taken me another 6 months to a year to take this to a doctor. With Qaly I gained valuable information. Qaly is the key.” — Jessi I. from Washington ----- Qaly members get peace of mind: • ECG analyzer for all watches and devices: Apple Watch ECG, Fitbit ECG, Kardia ECG, Wellue ECG, Withings ECG, WHOOP ECG, Garmin ECG, holter monitors, and more. • Borderline ECG, Inconclusive Apple Watch ECG, Inconclusive Fitbit ECG, Unclassified KardiaMobile EKG, WHOOP ECG, Garmin ECG, and all other Inconclusive ECGs analyzed within minutes, for clarity. • See irregular heartbeats like PAC and PVC on your ECG, analyzed by an expert ECG reader. • See your PR Interval, QRS Interval, and QTc Interval on your ECG, also analyzed by an expert EKG reader. • Get more from Qaly technician interpretations than your typical ECG analyzer app or HRV tracker: Qaly is the only ECG interpretation app where human experts provide professional analysis of your heart readings within minutes. • Share Qaly reports with your doctor, cardiologist, or electrophysiologist. ---- The Qaly app displays ECG data by integrating with the Health app. This is not available on the iPad. Disclaimer: 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. DO NOT RELY ON ELECTRONIC COMMUNICATIONS OR COMMUNICATION THROUGH THE QALY APPLICATION FOR IMMEDIATE, URGENT MEDICAL NEEDS. THE COMPANY SERVICE IS NOT DESIGNED OR INTENDED TO FACILITATE MEDICAL EMERGENCIES. ---- The electrocardiogram (ECG/EKG) functionality utilized by this app, available through Apple Watch and Withings devices, is accessible in regions where relevant regulatory clearances—such as FDA clearance, CE marking, UKCA marking, TGA approval, and Health Canada approval—are recognized and in effect.

About

Visible

This app helps individuals with energy-limiting health conditions manage their daily activity and rest. It provides personalized insights, tracks biometrics like heart rate variability, and logs symptoms to help users understand their body and avoid crashes. Users can generate health reports to share with their doctors and opt-in to research studies.

Highlights
  • Measure heart rate variability (HRV)
  • Track resting heart rate
  • Log symptoms and medication
  • Analyze daily exertion patterns
  • Generate long-term health reports
  • Participate in research studies
  • Real-time pacing notifications (with band)
Features
Read full description

Do you live with an energy-limiting health condition? Join over 250,000+ people with Long Covid, ME/CFS, POTS, Fibromyalgia, chronic fatigue and more who are improving their pacing with Visible. Get more from the energy you have. Pacing (balancing activity and rest) is one of the best ways to live well with your condition and reduce the risk of crashes or PEM. But pacing can be hard. Visible gives you personalized insights to help you understand your body, manage your energy and pace with more confidence. Unlike fitness tracking apps, Visible is designed to support rest and pacing, not workouts and exercise. MEASURE YOUR PACE Use your phone’s camera to measure your biometrics, including heart rate variability (HRV) and resting Heart Rate each morning. Understand your daily stability and make informed choices about how to pace your day. TRACK AND SPOT PATTERNS Log your symptoms, medication, and daily exertion to spot patterns over time. See how your lifestyle choices may be influencing how you feel and your biometrics. HEALTH REPORT AND EXPORT Download long-term health reports to get an overview of your trends and share them with your doctor. TAKE PART IN RESEARCH Opt-in to studies with world-leading researchers. Volunteer your data and help advance the science of energy-limiting conditions. GET ALL DAY DATA Pair the Visible band for real-time pacing notifications, PacePoints, all-day energy budgeting, and more. Only available in US and UK. THOUSANDS OF 5-STAR REVIEWS “Visible has been LIFE-CHANGING. I had fibromyalgia before COVID and thought I did well at pacing, but this has helped me on a whole new level.” – Roma “This is the first app in the 33 years since I have been diagnosed with this condition that shows me the data my doctor and I need. Fitness apps don't work well because they are not geared for people with POTS and PEM. This is the very first app that warns me when I have to SLOW DOWN and the monthly reports help my doctors get a better picture of how I'm doing.” – Lesli “Visible has been life changing making an invisible illness visible. It has been credibly validating to have concrete evidence to show to others about what is going on behind the scenes." – Eleanor Visible is not intended to provide medical services such as diagnosis, cure, mitigation, prevention, or treatment of any disease or medical condition. The app is not a substitute for the advice of a medical professional based on your personal circumstances. Always consult a doctor before making any medical decisions. For technical support, reach out to: [info@makevisible.com](mailto:info@makevisible.com) Privacy policy available at: https://www.makevisible.com/privacy

Screenshots

Qaly | ECG Reader4 screens
Visible4 screens

Verdict

The call

Qaly | ECG Reader and Visible both sit at 4.7 stars, but that hides the real split: 89% of Visible's written reviews are positive against 75% of Qaly | ECG Reader's. Visible also leads on ratings volume (3.7K vs 876) and iOS requirement (15.1 vs 17.6). On price, rating, update cadence and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Qaly | ECG Reader against 4.8 for Visible. Both are backed by a comparable volume of ratings — 876 and 3.7K respectively. Written reviews are what separate them: 75% of Qaly | ECG Reader's written reviews are positive against 89% of Visible's.

UpkeepUpdate frequency

Qaly | ECG Reader ships an update every 9 days, Visible fortnightly. The most recent releases landed on November 7, 2026 and November 6, 2026 respectively.

Scorecard3 real differences · 7 level
Qaly | ECG Reader versus Visible: the parameters behind the verdict, then further details
ParameterQaly | ECG ReaderVisible
PriceFreeFree
Rating4.7 (876 ratings)4.8 (3.7K ratings) — better
Positive reviews74.8% of reviews88.9% of reviews — better
Number of ratings8763.7K — better
Update frequencyEvery 9 days — betterFortnightly
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhoneiPhone, iPod — better
Requires iOS17.615.1 — better
Further details — not scored
Size101 MB205 MB
Age rating17+4+
DeveloperQaly, Inc.Visible Health Inc. (US)

Customer experience

Qaly | ECG Reader

All ratings876 ratings
Positive92.5%
Neutral1.4%
Negative6.2%
Written reviews234 reviews
Positive74.8%
Neutral4.3%
Negative20.9%

Visible

All ratings3,699 ratings
Positive95.2%
Neutral2.1%
Negative2.8%
Written reviews1,150 reviews
Positive88.9%
Neutral4.0%
Negative7.1%

User reviews

Qaly | ECG Reader

From 876 App Store ratings

What we love

  • 🚀 Quick response times
  • 👍 Helpful and reassuring technicians
  • 💡 Provides peace of mind
  • 👍 Detailed and informative ECG analysis
  • 👍 Easy to use app

Room to improve

  • 🐛 Inconsistent ECG analysis
  • 🔍 Lack of transparency around pricing
  • 🔍 Difficult to cancel subscription
  • 🕰️ Long wait times for ECG reviews
  • 🔍 Requires access to Apple Health data

Visible

From 3.7K App Store ratings

What we love

  • 🚀 Helpful for pacing and managing energy levels
  • 👍 Easy to use and customizable
  • 🚀 Provides valuable data and insights
  • 👍 Responsive and supportive development team
  • 🚀 Useful for communicating with doctors

Room to improve

  • 🐛 Occasional technical issues and glitches
  • 💡 Lack of integration with wearable devices
  • 🔋 Concerns about privacy and data usage
  • 💡 Need for more advanced features and reporting

Bugs and requests

Qaly | ECG Reader

Reported bugs

3 issues
  • App crashes on launch
  • Issues deleting account and data
  • Subscription charges not stopping after cancellation

Requested features

4 requests
  • Dark mode option
  • Ability to view past ECG history
  • Integration with more wearable devices
  • Option to request a specific technician review

Visible

Reported bugs

3 issues
  • App crashes or freezes on certain devices
  • Heart rate measurement issues with multi-camera phones
  • Inconsistent sync and data tracking

Requested features

5 requests
  • Dark mode option
  • Ability to track sleep quality and patterns
  • Integration with Apple Health or other health platforms
  • More customization options for symptoms and activities
  • Improved data export and sharing capabilities

In-app purchases

None

Qaly | ECG Reader

No in-app purchases

None

Visible

No in-app purchases

Questions

Is Qaly | ECG Reader free?
Qaly | ECG Reader is free to download, with no in-app purchases.
Is Visible free?
Visible is free to download, with no in-app purchases.
Which has better reviews, Qaly | ECG Reader or Visible?
Visible is rated higher. Qaly | ECG Reader averages 4.7 out of 5 from 876 ratings, while Visible averages 4.8 from 3.7K ratings.
Do Qaly | ECG Reader or Visible have ads?
Neither Qaly | ECG Reader nor Visible shows ads.
Which is updated more often, Qaly | ECG Reader or Visible?
Qaly | ECG Reader ships an update every 9 days, and Visible fortnightly. Most recently, Qaly | ECG Reader was updated on November 7, 2026 and Visible on November 6, 2026.

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