Comparison

Qaly | ECG Reader vs Clarity Builder

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 interprets readings from various devices, identifying over 30 heart rhythm abnormalities. Track heart rate variability to monitor stress and recovery, and share reports with your doctor.

Highlights
  • Expert ECG analysis
  • Supports multiple wearable devices
  • Identifies 30+ heart rhythm abnormalities
  • Heart rate variability tracking
  • Shareable reports for doctors
  • Human expert interpretation
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

Clarity Builder

Features
Read full description

Find clarity. Reduce Anxiety. Build peace. Clarity Builder is your daily companion for self-reflection, personal growth and mental clarity. Powered by AI, it helps you process your thoughts, discover insights, and move forward with purpose—one day at a time. Key Features & Benefits Guided Daily Journaling: Simple, structured prompts help you capture gratitude, habits, intentions, and reflections in minutes. Instant AI Insights: Receive personalized feedback and actionable suggestions after every entry—designed to help you grow, not just track. Progress Tracking: Look back on your journey, celebrate small wins, and see your growth over time. Privacy & Security: Your data is protected with industry-standard security and never sold. Minimal, Distraction-Free Design: Focus on what matters—your thoughts, your progress, your clarity. Why Choose Clarity Builder? Whether you’re feeling stressed, stuck, or simply want to improve, Clarity Builder gives you a safe space to reflect and grow. Designed for busy minds who want to feel progress every day, not just log another entry. Download now and start building a clearer, better you.

Screenshots

Qaly | ECG Reader4 screens
Clarity Builder4 screens

Verdict

The call

The clearest difference is iOS requirement: Clarity Builder at 13.4 against Qaly | ECG Reader's 17.6. On price, update cadence, ads and in-app purchases 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.

UpkeepUpdate frequency

Qaly | ECG Reader ships an update every 9 days, Clarity Builder fortnightly. The most recent releases landed on November 13, 2026 and November 12, 2026 respectively.

Scorecard1 real difference · 9 level
Qaly | ECG Reader versus Clarity Builder: the parameters behind the verdict, then further details
ParameterQaly | ECG ReaderClarity Builder
PriceFreeFree
Rating4.7 (879 ratings) — better—
Positive reviews74.8% of reviews—
Number of ratings879 — better—
Update frequencyEvery 9 days — betterFortnightly
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhoneiPhone, iPod — better
Requires iOS17.613.4 — better
Further details — not scored
Size101 MB19 MB
Age rating17+4+
DeveloperQaly, Inc.Jace Business Technology Solutions Inc

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

Clarity Builder

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Qaly | ECG Reader

No in-app purchases

None

Clarity Builder

No in-app purchases

Questions

Is Qaly | ECG Reader free?
Qaly | ECG Reader is free to download, with no in-app purchases.
Is Clarity Builder free?
Clarity Builder is free to download, with no in-app purchases.
Do Qaly | ECG Reader or Clarity Builder have ads?
Neither Qaly | ECG Reader nor Clarity Builder shows ads.
Which is updated more often, Qaly | ECG Reader or Clarity Builder?
Qaly | ECG Reader ships an update every 9 days, and Clarity Builder fortnightly. Most recently, Qaly | ECG Reader was updated on November 13, 2026 and Clarity Builder on November 12, 2026.

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