For everyone who owns an Apple Watch.

Read your Apple Watch ECG,
in detail.

ECG Tracker+ helps you review every Apple Watch ECG on your iPhone: the full waveform, QTc and HRV estimates, beat shape, and possible premature-beat patterns worth discussing with a clinician.

Download on theApp Store

Free to start · Private by design

ECG Tracker+ library listing Apple Watch ECG recordings with rhythm classifications and key measurements
ECG Tracker+ detail view showing a possible PVC pattern flag on the waveform
ECG Tracker+ Measurements screen with Signal Quality Excellent, heart rate, R-R interval, HRV, QRS duration and amplitude, each with a status dot
ECG measurements

The intervals that matter.

Heart rate, PR, QRS and QT/QTc estimates from an on-device model, paired with a signal-quality score that describes how usable the recording was.

  • On-device QT/QTc estimates with signal-quality context
  • Heart rate, PR, QRS and RR intervals
  • HRV (rMSSD) with quality flags
ECG Tracker+ Measurements screen: R-R interval 645 ms, HRV (rMSSD) 15 ms flagged to check, QRS duration 78 ms, QRS amplitude 0.74 mV, QT interval 342 ms and QTc (Framingham) 397 ms, each with a status dot, above a note that these are informational measurement tools and not a diagnosis

The real Measurements screen · straight from the app

Beat morphology

See your heartbeat's shape.

Every beat in a recording, overlaid into one representative shape. Outliers and possible premature-beat patterns stand out for review. Informational, never a diagnosis.

  • All beats overlaid into one template
  • Possible PAC / PVC patterns flagged for review
  • T-wave shape and possible wide-QRS pattern notes
ECG Tracker+ Beat Morphology screen: a representative heartbeat built from the most stable beats, with P, QRS and T fiducial markers, the isoelectric line, and a 341 ms QT interval measured by the tangent method (QRS onset to T end)

The real Beat Morphology screen · straight from the app

Trends

Track your changes over time.

App-generated heart rate, HRV, QTc and beat-regularity values, charted from one week to one year. Each range includes a plain summary of how those estimates changed.

  • App-generated heart rate, HRV, QTc and beat-regularity values over time
  • Seven-day, 30-day, 90-day and one-year views
  • A plain summary of how the app's estimates changed
ECG Tracker+ Trends heart-rate detail: a 30-day average of 76 bpm within the typical range, a distribution bar and a line chart of daily readings with high and low points marked
ECG Tracker+ Trends overview: a last-7-days recap noting a few extra beats, with heart rate and beat-regularity trend cards and their charts

Real Trends screens · straight from the app

Export

A report worth sharing.

Export any recording as a clean, print-ready PDF with the calibrated ECG strip, informational measurements and Apple Watch classification, ready to share with a clinician.

A print-ready ECG Tracker+ PDF report: a 30-second calibrated ECG strip with R-R markers, plus measurements, a representative beat, an HRV plot and the rhythm classification

Generated by ECG Tracker+ · print-ready PDF

Privacy

Yours, and yours alone.

ECG recordings and analysis stay on your paired Apple devices. Optional feedback and diagnostics may be sent to Sentry.

Processed on-device

Every ECG measurement is computed on your iPhone. ECG recordings and analysis stay on your paired Apple devices. Optional feedback and diagnostics may be sent to Sentry.

HealthKit, read-only

We read only the ECG recordings you choose to share. We never write to Health.

Delete anytime

Wipe every imported recording and analysis from the app in a single tap.

What it measures

Every number, explained.

ECG Tracker+ turns the raw Apple Watch waveform into informational estimates and explains what each one represents. None is a diagnosis.

Heart rate
Your beats per minute across the recording, with the highest and lowest points.
R-R interval
The time from one heartbeat to the next, the basis for rhythm and variability.
PR interval
The time from the P wave to the QRS, as the signal travels from the upper chambers to the lower ones.
QRS duration & amplitude
How long the main ventricular spike lasts, in milliseconds, and how tall it is, in millivolts.
QT interval
An estimate from the start of the QRS to the end of the T wave, calculated on-device using the tangent method.
QTc
The QT estimate adjusted for heart rate using Bazett, Fridericia, Framingham or Hodges. Formula choice can change the result.
HRV (rMSSD & SDNN)
Two time-domain estimates of beat-to-beat variability, calculated from each 30-second recording. They are not interchangeable with standard five-minute or 24-hour HRV values.
Beat morphology
Every beat overlaid into one representative shape, with P, QRS and T markers and the isoelectric line.
Possible extra beats
Possible premature-beat patterns, such as possible PAC or PVC patterns, flagged for review. These are not confirmed findings or a diagnosis.
Signal quality
A score describing how usable the recording was for the app's calculations. It does not establish clinical accuracy.
Learn

Understand your recording.

Clear, sourced guides explain what a 30-second single-lead ECG can show, where its limits are, and how to review informational estimates.

Single-lead ECGWhat your Apple Watch ECG can show

See how the 30-second waveform differs from a clinical 12-lead ECG.

 QT and QTcWhy QTc formulas differ

Compare four correction formulas and understand the limits of a single-lead estimate.

 HRVrMSSD and SDNN in context

Learn why a 30-second HRV estimate is an ultra-short snapshot.

 Premature beatsPossible PAC and PVC patterns

Understand why a possible pattern flag is a review cue, not a diagnosis.

Good questions.

ECG Tracker+ imports your Apple Watch ECG recordings for detailed viewing on your iPhone. It shows the full waveform, informational QTc and HRV estimates, QRS, possible premature-beat flags, beat morphology, trends and a shareable PDF. It is free to start and works on-device.

No. ECG Tracker+ is an informational measurement and visualization tool. It does not provide a diagnosis and is not a substitute for professional medical advice. Always talk to a clinician about your heart health.

Any Apple Watch ECG recording that has synced to the Health app on your iPhone. ECG Tracker+ imports those recordings, so you don't need to record anything new.

ECG recordings and analysis stay on your paired Apple devices. Optional feedback and diagnostics may be sent to Sentry. No account is required for ECG import or analysis.

You can import and view your recordings for free. Premium unlocks the detailed measurements, QT/QTc analysis, trends and PDF export.

It shows the full waveform with heart rate, R-R and PR intervals, QRS duration and amplitude, QT and QTc estimates, and ultra-short HRV estimates such as rMSSD and SDNN. A signal-quality score describes recording usability. Everything is informational, not a diagnosis.

ECG Tracker+ estimates QT from the single-lead waveform and calculates QTc with Bazett, Fridericia, Framingham or Hodges. Formula choice, heart rate and waveform quality can change the result. These estimates do not diagnose or rule out any condition.

Heart-rate variability describes changes in the time between heartbeats. ECG Tracker+ estimates rMSSD and SDNN from each 30-second recording and charts the app-generated values over time. These ultra-short estimates are informational, not a diagnosis.

It may highlight possible premature-beat patterns, such as possible PAC or PVC patterns, for review. A flag is not a confirmed finding, and no flag does not rule out premature beats. Discuss concerns with a qualified clinician.

Export a recording as a clean PDF with the calibrated ECG strip, informational measurements, a representative beat and the Apple Watch rhythm classification. Bring it to an appointment or send it to a clinician.

Take an ECG with Apple's ECG app, then open ECG Tracker+ on your Watch to review results sent from your paired iPhone. The iPhone imports and analyzes the ECG on-device. Keep it nearby and unlocked for the fastest handoff. If it is locked, ECG Tracker+ catches up after you unlock it.

Your heart,
in focus.

Download on theApp Store

Free to start · Private by design