# ECG Link + HRV, QTc Trends — ECG Analyzer,HRV, QTc Trends

> ECG Analyzer,HRV, QTc Trends (iPhone/iPad app by Hangzhou Julin Technology Co., Ltd.)

- Source: https://appshunter.io/ios/app/ecg-link-plus-hrv-qtc-trends/id6786578242 (this page in markdown: same URL + `.md`)
- Developer: [Hangzhou Julin Technology Co., Ltd](https://appshunter.io/developer/1597551892)
- Category: Health & Fitness, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.6 · 24 MB
- Languages: American English, Arabic, French (France), German (Germany), Hindi, Hungarian, Italian, Japanese, Russian, Chinese (Simplified, China) and 1 more
- Released: 2026-07-16
- Data updated: 2026-10-24

## What is ECG Link + HRV, QTc Trends?

Standard Apple EULA ：https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

[Introduction]
ECGLink is a private local visualization and reference log tool designed for Apple Watch users. It reads your ECG records securely via Apple HealthKit and provides a comprehensive view of ECG waveforms, Heart Rate Variability (HRV) scatter plots, and simple PDF report generation on your iPhone or iPad.
All health data remains stored locally on your device to ensure maximum privacy.
[Key Features]
* ECG Waveform Review: Visualize raw ECG data with high-resolution rendering, allowing you to scroll and examine waveform details.
* HRV Poincaré Scatter Plots (VIP): Convert raw R-R interval data into Poincaré scatter plots to visualize heart rate variability distribution.
* Physiological Estimations: Provide mathematical references and rule-based estimations for standard intervals like PR and QTc (calculated via Bazett formula).
* Export PDF Reports (VIP): Generate formatted ECG report PDFs for convenient logging, local printing, or manual sharing.
* Local Symptom Notes: Tag symptoms (e.g., palpitations, chest tightness, dizziness) and write personal notes alongside your recording.
* Academic References: Comprehensive citations and references from official medical entities (AHA, NIH) and peer-reviewed journals are cited within the app and report footers.
[Privacy Commitment]
ECGLink is designed with local-first data isolation. Your health records, ECG waves, symptom tags, and local settings remain securely within your device's sandbox. We do not transmit or upload your health data to any server.
[Medical Disclaimer]
1. Not a Medical Device: ECGLink is NOT a medical device. It does not diagnose, treat, prevent, or recommend treatments for any medical conditions. All estimated metrics (such as HRV, PR, QTc) are for reference and educational use only.
2. Rhythm Classification: All rhythm classifications (e.g., Sinus Rhythm, Atrial Fibrillation) are performed and categorized by the FDA-cleared Apple Watch ECG system. ECGLink only visualizes existing HealthKit data and does not independently analyze or reclassify arrhythmias.
3. Seek Medical Consultation: Do not change medications or skip healthcare professional consultation based on the app's contents. Always seek professional advice if you feel unwell or suspect any health issues.

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Weekly | $1.99 | per 7 days |
| Premium Monthly | $7.99 | per month |
| Premium Yearly | $24.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium Lifetime | $49.99 | one-time |


## Is ECG Link + HRV, QTc Trends safe?

Not enough ratings yet to assess ECG Link + HRV, QTc Trends.

## Is ECG Link + HRV, QTc Trends legit?

ECG Link + HRV, QTc Trends appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for ECG Link + HRV, QTc Trends is 70 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.0.4 — 2026-10-23

Thank you for using ECG Link! In this update, we bring new features and improvements to enhance your heart health tracking:

1. All-New iOS Widgets: Introducing beautifully crafted Home and Lock Screen widgets. Check your latest ECG status, heart rate, and health trends at a glance without opening the app.
2. Enhanced Apple Watch Sync: Seamlessly import and review ECG recordings from your Apple Watch with faster data transfer and smoother waveform analysis.
3. Widget Experience Polish: Added full bilingual support with refined status indicators and display logic.
4. Performance & Stability: Enhanced waveform playback smoothness and resolved known issues for an overall faster, more reliable experience.

### 1.0.3 — 2026-09-25

【Longitudinal ECG Trend Analysis】

Multi-Session Evolution: Consolidates past recordings to visualize long-term trends across Heart Rate, HRV (rMSSD), QTc, PR, and QRS duration.
Fluid Timeline Browsing: Effortlessly swipe through historical records with a sticky reference axis, and tap any session to instantly review the underlying ECG waveform.

### 1.0.2 — 2026-09-24

1. Brand-New Dedicated Module: Multi-Session ECG Parameter Trends
   • Long-Term Rhythm Evolution: Explore our new top-level "Trends" tab to track sequential physiological trends across 3 to 20+ ECG recordings.
   • Free Core Dynamics: Heart Rate (HR) evolutionary waveform charts are now available for all users for free.
2. VIP Advanced Cardiac Electrophysiology Analytics
   • Unlock long-term trend analysis for HRV (RMSSD), Corrected QT (QTc), PR interval, and QRS duration.
   • Session parameter overview cards with instant one-tap navigation back to high-resolution rhythm waveforms.
3. Professional PDF Export with VIP Protection
   • Export clinical-grade ECG reports formatted to standard 25mm/s medical grids, ready for print or sharing with healthcare professionals.
4. Deep HealthKit ECG Synchronization
   • Extended HealthKit synchronization window up to 5 years, comprehensively retrieving your historical Apple Watch ECG recordings.
   • Enhanced offline fault tolerance for a smoother and more robust experience without internet access.

### 1.0.1 — 2026-08-01

1. Improved user experience.
2. Fixed known bugs.
3. Added multi-language support.

### 1.0 — 2026-07-17

No release notes.

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All apps by Hangzhou Julin Technology Co., Ltd: https://appshunter.io/developer/1597551892

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-24.*