CardioWatch Pro Support

About CardioWatch Pro

CardioWatch Pro is a daily stress companion and ECG deep-analysis app for iPhone. It reads the heart data your Apple Watch already records — HRV, heart rate, sleep, activity, and ECG — tracks your stress against your own personal baseline, and shows ECG interval measurements (QTc, PR, QRS) with reference ranges. All analysis runs on your iPhone; there is no cloud and no account.

CardioWatch Pro is not a medical device and does not provide medical diagnosis. All measurements are for reference only.

Requirements

• iPhone running iOS 17 or later.
• An Apple Watch that records heart rate and HRV (for stress tracking).
• Apple Watch Series 4 or later with the Apple ECG app (for ECG features). The optional Watch companion app requires watchOS 10 or later.

Frequently asked questions

How do I record an ECG?

Record ECGs with Apple's built-in ECG app on your Apple Watch. Apple does not allow third-party apps to start an ECG recording. Once the recording syncs to the Health app on your iPhone, CardioWatch Pro picks it up automatically and analyzes it on device.

The app shows no data — what should I check?

1. Make sure you granted Health access. Open Settings → Health → Data Access & Devices → CardioWatch Pro and enable the requested categories.
2. Confirm your Apple Watch is paired and has synced recently — open the Health app and check that heart rate and HRV samples are arriving.
3. New ECG recordings can take a moment to sync from the Watch. Keep iPhone and Watch close together and unlocked.

How are stress levels calculated?

CardioWatch Pro compares your current HRV readings against your own 30-day history rather than fixed thresholds, because normal HRV differs a lot by age and fitness. The app needs about 7 days of data to build a personal baseline; before that it uses an age-group reference as a temporary baseline, so early readings may shift as the app learns your normal range.

What is free and what requires a subscription?

Free: the daily stress timeline, same-day ECG waveform viewing, symptom tagging, widgets, and the recording streak. The optional subscription unlocks ECG interval measurements (QTc, PR, QRS) with reference ranges, rhythm feature labels, 7/30/90-day history, PDF report export, medication QTc reference information, and weekly/monthly trend analysis. Current pricing is shown in the app and on the App Store listing.

How do I manage or cancel my subscription?

Subscriptions are handled by Apple. Open Settings → [Your Name] → Subscriptions on your iPhone to manage or cancel. Refunds follow Apple's refund policy.

How do I share results with my doctor?

Use the PDF report export (subscription feature). The report includes the ECG waveform, interval measurements with reference ranges, your symptom tags, and recording streak. You choose how to share it — nothing is sent anywhere unless you share it yourself.

How do I delete my data?

• App data: uninstall CardioWatch Pro. All analysis results are stored locally and are removed with the app.
• Health data: your underlying ECG, heart rate, and HRV recordings live in Apple Health, not in CardioWatch Pro. Manage them in the Health app. You can also revoke CardioWatch Pro's read access at any time in Settings → Health → Data Access & Devices.

Is CardioWatch Pro a medical device?

No. CardioWatch Pro does not diagnose, treat, or prevent any disease. Measurements are shown with reference ranges for your information only. If you experience chest pain, severe dizziness, or difficulty breathing, call emergency services immediately — do not rely on this app.

Reporting a bug

Please include the following so we can reproduce the problem:

• iPhone model and iOS version (Settings → General → About).
• Apple Watch model and watchOS version, if relevant.
• CardioWatch Pro version (Settings tab inside the app).
• What you were doing when the issue happened.
• What you expected versus what actually happened.

Send the report to [email protected].

Privacy and terms

CardioWatch Pro does not collect personal data — all processing happens on your device. See the CardioWatch Pro Privacy Policy and the CardioWatch Pro Terms of Use for details.