SSRI QT Tracker
QT/QTc from your Health ECGs
$0.99 · Designed for iPad. Not verified for macOS.
Keep an eye on your QT/QTc interval during SSRI therapy – automatically from Apple Health, with a doctor's report, entirely on your iPhone.
QT Tracker automatically analyzes your smartwatch ECGs from Apple Health and computes the QT and QTc interval – ideal for keeping an eye on your heart when starting, during and after SSRI therapy or other QT-prolonging medication.
• Automatic import of your ECGs from Apple Health – optionally with a notification whenever a new ECG arrives
• Precise QT measurement using the tangent method on an averaged, low-noise heartbeat
• QTc via Fridericia, Bazett, Framingham and Hodges
• Clear trend chart with zones (450 / 470 / 500 ms), baseline and trend line – for 1 month, 6 months, 12 months, the therapy or everything
• Therapy start and end: baseline before the start, trend during therapy, recovery afterwards
• Import medications and logged doses from Apple Health (iOS 26 or later)
• Resting heart rate and HRV (SDNN) trends
• Doctor's report as PDF: trend, ECG traces with measurement points, measurement table, medications with dose – in A4 or US Letter
• Share cards for social media: “QT normal” – honest even when readings stand out
• Measurement reminders, CSV export, light and dark mode, 31 languages
• 100% offline: no cloud, no account, your data is never shared
How it works: Record an ECG with your smartwatch. QT Tracker reads it from Apple Health, averages the beats into a clean signal, and detects the QRS onset and T-wave end with the tangent method. From these it derives QT and the rate-corrected QTc values that you can follow over time.
Important: QT Tracker is not a medical device and does not replace a physician's ECG interpretation or diagnosis. The automatic measurement may differ from clinical assessment and is intended solely for your personal tracking. If you have symptoms or a QTc of 500 ms or more, seek medical advice, and never stop an SSRI on your own.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• All-new design with light and dark mode
• Clearer charts with time ranges and therapy phases
• Medications and doses from Apple Health
• Automatic notification when a new ECG arrives
• Improved doctor's report (A4/US Letter, dose, before/during/after therapy)
• Share cards for social media
• New onboarding
• Icelandic
The developer, Peter Holzhauser, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Peter Holzhauser
- Size
- 32.1 MB
- Category
- Medical
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 30 more
- English, Arabic, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hungarian, Icelandic, Indonesian, Italian, Japanese, Korean, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
Health or Wellness Topics
- Copyright
- © 2026 Peter Holzhauser
