This update makes ECG Tracker+ faster and clearer, from the waveform on your iPhone to the findings on your wrist. • New PAC and PVC model checkpoint. Our on-device model for flagging possible premature beats keeps training, and this update ships its latest checkpoint after another round of evaluation. It shows possible findings for your information only, runs privately on your iPhone, and we keep working on it. • Smoother waveform. We optimized how the ECG viewer renders and scrolls, so even long recordings feel fluid when you move through them. • Refined measurement cards. Cleaner, more consistent colors and shorter expanded cards, plus a clearer recording quality badge, make it easier to see at a glance how good each recording was. • Clearer finding markers on Apple Watch. We refined how possible findings are marked on the waveform in the Apple Watch companion app. Badges are tidier, placement near the start and end of a recording is better, and the layout now matches iPhone. Thank you for your feedback and suggestions. You help shape every update. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and measurements may be affected by signal noise or recording artifacts. Possible findings, including possible premature beats, are shown for information only and are not a diagnosis. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

This small update brings performance improvements, bug fixes, and refinements for a smoother, more reliable experience. INTRODUCED IN VERSION 1.3 • Heart Rate Timeline brings your Apple Health heart rate readings and ECGs together in one daily view. • Trends on Apple Watch lets you explore your ECG measurements from your wrist, with longer time ranges available with Pro. • Improved notes, Library filters, and measurement comparisons make it easier to find recordings and explore changes over time. Thank you for your feedback and suggestions. You help shape every update. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and measurements may be affected by signal noise or recording artifacts. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

This small update brings performance improvements, bug fixes, and refinements for a smoother, more reliable experience. INTRODUCED IN VERSION 1.3 • Heart Rate Timeline brings your Apple Health heart rate readings and ECGs together in one daily view. • Trends on Apple Watch lets you explore your ECG measurements from your wrist, with longer time ranges available with Pro. • Improved notes, Library filters, and measurement comparisons make it easier to find recordings and explore changes over time. Thank you for your feedback and suggestions. You help shape every update. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and measurements may be affected by signal noise or recording artifacts. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

Your ECGs. More of the story. Version 1.3 brings more context to your recordings, from the heart rate readings around them to your notes and changes over time. SEE WHERE EACH RECORDING FITS The new Heart Rate Timeline brings your Apple Health heart rate readings and ECGs together in one daily view. Explore the readings around a recording and see where it fits into your day. This feature started with suggestions from three of our users. Thank you for every idea and piece of feedback. You help us build an app around what matters to you. YOUR TRENDS, NOW ON APPLE WATCH Browse your ECG measurements and explore different time ranges, right from your wrist. Trends sync from your iPhone, with longer time ranges available with Pro. MORE CONTEXT, LESS SEARCHING Add notes in the redesigned editor, read them directly on your Library cards, and find them with the With notes filter. Updated measurement cards let you compare values with your earlier comparable ECGs, while refreshed Trends recaps bring together key measurements and comparisons when enough recordings are available. AN UPDATED PVC/PAC MODEL This release introduces our latest PVC/PAC specialist model, trained on four times as much public training data as the previous version. Your ECG data never leaves your iPhone for analysis. Our machine learning models run entirely locally on your device, with privacy built into the app from the start. SMALL CHANGES YOU’LL NOTICE • Clearer highlights and compact labels for possible findings on the ECG waveform. • Refreshed onboarding for new users, with animated feature previews. • Cleaner layouts and smoother Library navigation. • Improved Apple Watch sync recovery and clearer update times. Have an idea for what comes next? Open Settings and choose Contact Support. We’d love to hear from you. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and measurements may be affected by signal noise or recording artifacts. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

Your ECGs. More of the story. Version 1.3.0 brings more context to your recordings, from the heart rate readings around them to your notes and changes over time. SEE WHERE EACH RECORDING FITS The new Heart Rate Timeline brings your Apple Health heart rate readings and ECGs together in one daily view. Explore the readings around a recording and see where it fits into your day. This feature started with suggestions from three of our users. Thank you for every idea and piece of feedback. You help us build an app around what matters to you. YOUR TRENDS, NOW ON APPLE WATCH Browse your ECG measurements and explore different time ranges, right from your wrist. Trends sync from your iPhone, with longer time ranges available with Pro. MORE CONTEXT, LESS SEARCHING Add notes in the redesigned editor, read them directly on your Library cards, and find them with the With notes filter. Updated measurement cards let you compare values with your earlier comparable ECGs, while refreshed Trends recaps bring together key measurements and comparisons when enough recordings are available. AN UPDATED PVC/PAC MODEL This release introduces our latest PVC/PAC specialist model, trained on four times as much public training data as the previous version. Your ECG data never leaves your iPhone for analysis. Our machine learning models run entirely locally on your device, with privacy built into the app from the start. SMALL CHANGES YOU’LL NOTICE • Clearer highlights and compact labels for possible findings on the ECG waveform. • Refreshed onboarding for new users, with animated feature previews. • Cleaner layouts and smoother Library navigation. • Improved Apple Watch sync recovery and clearer update times. Have an idea for what comes next? Open Settings and choose Contact Support. We’d love to hear from you. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and measurements may be affected by signal noise or recording artifacts. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

We redesigned the Trends charts to make patterns and changes easier to read, and refined several controls and interactions throughout the Trends experience. Your feedback helps shape ECG Tracker+. If there is something you would like us to add to Trends, or if something does not work as you expect, open Settings and choose Contact Support. Tell us what would make the app more useful for you. We also fixed several issues in Beat Morphology and made additional reliability improvements throughout the app for a smoother, more stable experience. All ECG analysis runs on-device on your iPhone. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and measurements may be affected by signal noise or recording artifacts. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

This update includes small performance and app stability improvements. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and the accuracy of its information depends on recording quality and may be affected by signal noise or recording artifacts. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

We fixed a few issues affecting the Beat Morphology view. It now renders a single representative beat more consistently, with cleaner waveform boundaries and better marker alignment. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and the accuracy of its information depends on recording quality and may be affected by signal noise or recording artifacts. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

Version 1.2 introduces a newly trained second generation of on-device ML models, more reliable Apple Watch syncing, and improvements shaped by your feedback. SECOND-GENERATION ON-DEVICE ML MODELS For this generation, we expanded and refined the training data with many more noise-affected recordings from labeled public ECG datasets. We focused on motion artifacts, difficult waveform shapes, and borderline beats the previous analysis could mistake for possible findings. This more demanding training mix helps the newly trained models filter noise-driven false positives while preserving the signal patterns behind well-supported possible findings. The updated pipeline combines evidence across P waves, QRS complexes, QT and QTc, T-wave shape, rhythm patterns, beat classification, and signal quality. When a recording does not provide enough reliable information, ECG Tracker+ is more willing to leave a result unavailable instead of forcing an answer. In our internal benchmarks, the updated pipeline produced up to five times fewer false-positive possible PAC and PVC highlights than the previous version. Several supported measurement estimates also showed improved accuracy against benchmark references. These benchmark results do not guarantee the same improvement for every ECG. Performance depends on recording quality, signal noise, movement, and individual waveform characteristics. Your saved ECGs will refresh automatically in the background using the updated on-device pipeline. BETTER APPLE WATCH SYNC The Apple Watch companion app and iPhone sync now recover more reliably after temporary disconnects, with clearer progress when transfers resume. IMPROVEMENTS REQUESTED BY YOU • Choose your preferred QTc correction formula. Your selection updates across the Library, ECG Detail, Beat Morphology, Trends, and PDF reports. • Combine possible findings with measurement ranges for more precise Library filtering. • Open the expanded waveform display to inspect small details without losing your place. Thank you to everyone who contacted us with ideas and thoughtful feedback. Your suggestions continue to shape ECG Tracker+. We are grateful for your trust and for choosing ECG Tracker+. All ECG analysis runs on-device on your iPhone. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and the accuracy of its information depends on recording quality and may be affected by signal noise or recording artifacts. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

Version 1.2.0 introduces a newly trained second generation of on-device ML models, more reliable Apple Watch syncing, and improvements shaped by your feedback. SECOND-GENERATION ON-DEVICE ML MODELS For this generation, we expanded and refined the training data with many more noise-affected recordings from labeled public ECG datasets. We focused on motion artifacts, difficult waveform shapes, and borderline beats the previous analysis could mistake for possible findings. This more demanding training mix helps the newly trained models filter noise-driven false positives while preserving the signal patterns behind well-supported possible findings. The updated pipeline combines evidence across P waves, QRS complexes, QT and QTc, T-wave shape, rhythm patterns, beat classification, and signal quality. When a recording does not provide enough reliable information, ECG Tracker+ is more willing to leave a result unavailable instead of forcing an answer. In our internal benchmarks, the updated pipeline produced up to five times fewer false-positive possible PAC and PVC highlights than the previous version. Several supported measurement estimates also showed improved accuracy against benchmark references. These benchmark results do not guarantee the same improvement for every ECG. Performance depends on recording quality, signal noise, movement, and individual waveform characteristics. Your saved ECGs will refresh automatically in the background using the updated on-device pipeline. BETTER APPLE WATCH SYNC The Apple Watch companion app and iPhone sync now recover more reliably after temporary disconnects, with clearer progress when transfers resume. IMPROVEMENTS REQUESTED BY YOU • Choose your preferred QTc correction formula. Your selection updates across the Library, ECG Detail, Beat Morphology, Trends, and PDF reports. • Combine possible findings with measurement ranges for more precise Library filtering. • Open the expanded waveform display to inspect small details without losing your place. Thank you to everyone who contacted us with ideas and thoughtful feedback. Your suggestions continue to shape ECG Tracker+. We are grateful for your trust and for choosing ECG Tracker+. All ECG analysis runs on-device on your iPhone. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and the accuracy of its information depends on recording quality and may be affected by signal noise or recording artifacts. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

Version 1.1.7 focuses on performance improvements and bug fixes throughout ECG Tracker+. We’ve added a Contact Support button in Settings, so you can email us directly when you’d like a response. Send Feedback remains anonymous, so we can’t reply to messages sent there. All ECG analysis runs on-device on your iPhone. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and measurements may be affected by signal noise or recording artifacts. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

Version 1.1.6 brings ECG Tracker+ to Apple Watch and gives you more control over your Library. • ECG Tracker+ on Apple Watch. Take an ECG with Apple's ECG app, then open ECG Tracker+ on your watch to check the result. Analysis stays private on your paired iPhone. • Notifications when a recording is ready. Get an alert after iPhone analysis finishes, with optional weekly recaps. Control each alert in Settings. • Better organization for shared Apple Watches. We heard from people who let family members use their Apple Watch to take ECGs. You can now tag recordings by person, activity, or any other context, filter your Library by tag, and exclude selected tags from Trends. For more control, manual import lets you choose exactly which Apple Health ECGs are added. • A new ECG Guide. Find clear, contextual explanations for measurements and ECG concepts throughout the app. • Performance improvements and bug fixes. This update includes many performance improvements and fixes across background imports, analysis, the Library, and the rest of the app. All ECG analysis runs on-device on your iPhone. ECG Tracker+ is an informational measurement tool and is not a medical device. It can make mistakes, and measurements may be affected by signal noise or recording artifacts. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified medical professional about your ECG or health concerns. If you think you may be experiencing a medical emergency, contact your local emergency services immediately.

We improved overall performance and stability, and fixed a few minor issues. Thanks for using ECG Tracker+.

This update is all about the details. We focused on performance and stability across the app. ECG Tracker+ now feels faster and more responsive, and we smoothed over a range of small issues so everyday use is more reliable, from the first launch to your latest reading. As always, every ECG is analyzed right here on your iPhone. No account, no cloud, and nothing is ever uploaded. ECG Tracker+ shows informational measurements only and is not a medical device. It does not diagnose conditions or replace professional medical advice.

A clearer view of your heart, from your first reading to your long-term trends This update rebuilds the Trends tab, welcomes new users with a guided tour, and brings our Liquid Glass look to nearly every screen. • A redesigned Trends tab. Trends now opens with a plain-language recap of the exact range you pick, whether that's 7 days, 90 days, or a year, with a period-over-period comparison. Every measurement gets its own color-coded card, your heart rate, HRV and QTc sit on the same reference ranges the detail screen uses, the over-time charts are redrawn with your usual range and the period's high and low marked, and HRV gains a Poincaré plot you can actually read. • A guided welcome for new users. First launch now walks you through the app with a hands-on tour built on sample recordings, so you can see how the Library, a detailed reading, and your Trends fit together before importing your own. • A fresh new look. We brought the app's Liquid Glass design to nearly every screen, with a redesigned subscription page and cleaner, brighter surfaces throughout. • Stability and polish. This release also includes a wide range of bug fixes and performance improvements to make the whole app faster and more reliable. Everything runs entirely on-device. No cloud, no servers, no account. ECG Tracker+ shows informational measurements only and is not a medical device. It does not diagnose conditions or replace professional medical advice. Measurements are estimates and can be affected by signal noise or recording artifacts. Always consult a qualified clinician for interpretation of your ECG, and if you think you may be having a medical emergency, contact local emergency services immediately.

Three upgrades to how you read your ECG We're back with a big one — and this update is all about giving you more detail per beat and more confidence in every number. ECG Tracker+ now reads a part of your heartbeat it never measured before, shows you exactly how much to trust each reading, and explains the science right where you're looking. • A new P-wave model — For the first time, an on-device model reads the P wave at the very start of each beat, unlocking two new measurements: the PR interval and P-wave duration. It's the same approach behind our fiducial model family, tuned to run entirely on your iPhone. • Quality you can read at a glance — Every QT and QTc measurement now carries a clear quality indicator, so you instantly see how confidently the T-wave endpoint was located — from a clean, well-supported signal down to noisy traces to interpret with caution. No more guessing how much weight to give a reading. • A refreshed beat morphology view — Your average beat is now drawn on a calibrated grid with the P, QRS and T regions marked, above a redesigned set of measurement tiles — cleaner, sharper, and easier to read. • Learn as you go — New tap-to-open explainers across the app break down what each measurement actually means — PR, QT/QTc, QRS duration, beat morphology and more — in plain language, exactly where you need them. Everything runs entirely on-device — no cloud, no servers, no account. ECG Tracker+ shows informational measurements only and is not a medical device. It does not diagnose conditions or replace professional medical advice. Measurements and quality levels are estimates and can be affected by signal noise or recording artifacts. Always consult a qualified clinician for interpretation of your ECG, and if you think you may be having a medical emergency, contact local emergency services immediately.

We fixed several bugs that were affecting our new machine learning-based ECG analysis, so it now runs more accurately and reliably. ECG Tracker+ is an informational tool and does not provide a medical diagnosis.

We're shipping a new update — and this one is a big one. For the first time, ECG Tracker+ runs on our own family of in-house ECG models. • Our new Fiducial Model Family was trained over weeks on large, expert-annotated public ECG datasets, then tuned to run fully on-device by harnessing the power of Apple Silicon. • Sharper P, Q, R, S, T placement means cleaner QT measurements — especially on noisy Apple Watch traces where the previous pipeline used to back off. • More reliable beat-shape detection across a wider range of heart rates and signal quality. • Five new findings ECG Tracker+ now flags end-to-end — on the library card and highlighted on the waveform: ‣ Bigeminy and trigeminy — repeating premature-beat patterns ‣ Possible VT run — three or more consecutive premature ventricular beats ‣ Wide QRS / possible bundle branch block — when QRS duration ≥120 ms ‣ T-wave inversion — negative T-wave polarity on the representative beat Everything still runs 100% on-device — no cloud, no servers, no accounts. ECG Tracker+ is an informational tool, not a medical device.

Thanks to your requests, ECG Tracker+ now supports Czech, Greek, Dutch, and Hindi. This update also fixes several issues across the app and improves overall performance and reliability.

In version 1.0.4: • Lifetime access is now available after many requests. • Fixed multiple issues across the app. • Improved performance for a faster, smoother experience.

- General stability improvements

- General stability improvements

- Updated localized copy and translations across supported languages. - Improved free plan user experience - General stability improvements