# HeartLab: ECG & Heart Analysis — AFib PVC PAC Arrhythmia HRV AI > Smartwatch ECG analysis with AI explanations and professional PDF reports. (iPhone/iPad app by CEPALabs SH.P.K..) - Source: https://appshunter.io/ios/app/heartlab-ecg-and-heart-analysis/id6757519025 (this page in markdown: same URL + `.md`) - Developer: [CEPALabs SH.P.K.](https://appshunter.io/developer/1861138147) - Category: Medical, Health & Fitness - Price: Free with in-app purchases - Rating: 3.70/5 from 19 App Store ratings · 11 written reviews indexed - Age rating: 12+ - Requires: iOS 17 · 40 MB - Languages: Russian, Albanian, Hindi, American English, Arabic, Dutch, Greek, Danish, European Spanish, Italian and 13 more - Released: 2026-02-22 - Data updated: 2026-09-07 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/heartlab-ecg-and-heart-analysis/id6757519025/reviews.md ## What is HeartLab? Your smartwatch records ECGs. But do you truly understand what they reveal? HeartLab transforms your ECG data into comprehensive cardiac insights that go far beyond what basic health apps show you. Professional-grade analysis, AI-powered explanations, and PDF reports your cardiologist will actually appreciate. ADVANCED ARRHYTHMIA DETECTION While standard ECG apps only detect Atrial Fibrillation (AFib), HeartLab identifies five types of heart rhythm irregularities: • Atrial Fibrillation (AFib) - Irregular heartbeat originating in the atria • Premature Atrial Contractions (PAC) - Early beats from the atria • Premature Ventricular Contractions (PVC) - Early beats from the ventricles • Bigeminy - Alternating pattern of normal and premature beats • Trigeminy - Pattern of two normal beats followed by a premature beat Our algorithms analyze every single heartbeat to find patterns that other apps miss completely. COMPLETE HRV ANALYSIS Get the full picture of your Heart Rate Variability with 12+ professional metrics: • SDNN - Standard deviation of NN intervals, key indicator of overall heart health • rMSSD - Reflects parasympathetic nervous system activity • pNN50 - Percentage of adjacent intervals differing by more than 50ms • Poincaré Plot - Visual representation of heart rate dynamics • Cardiac Score - Our proprietary algorithm combining multiple metrics The same metrics used in professional cardiac research, now accessible on your iPhone. AI-POWERED EXPLANATIONS Don't understand medical terminology? Our AI assistant explains your ECG results in plain language, answers your questions, and helps you understand what your heart data actually means. No more confusion about what those squiggly lines represent. PROFESSIONAL PDF REPORTS Generate detailed medical-grade reports that you can share with your cardiologist. Each report includes: • Complete ECG waveform visualization • All measurements and intervals • HRV metrics and trends • Detected anomalies and patterns • Historical comparison Doctors recognize and trust this format. Many cardiologists now request HeartLab reports during appointments. SEAMLESS INTEGRATION • Automatic ECG import from Apple Health • No manual export or complicated setup • Record your ECG, see analysis in seconds • Complete historical data access • Organized timeline view 100% PRIVACY-FIRST Your ECG data never leaves your iPhone. All analysis is performed locally using advanced algorithms optimized for mobile devices. No cloud processing, no data uploads, no accounts required. Complete privacy, always. DESIGNED FOR EVERYONE Whether you're monitoring a known condition, tracking athletic recovery through HRV, or simply curious about your heart health, HeartLab provides the insights you need in a format you can understand. Trusted by thousands of users in 47+ countries. Join them today. --- Terms of Use: https://www.heartlab.it/terms.html Privacy Policy: https://www.heartlab.it/privacy.html Medical Disclaimer: HeartLab is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease or health condition. The app is for informational and educational purposes only. Always consult a qualified healthcare professional for medical advice, diagnosis, or treatment. In case of a medical emergency, call your local emergency services immediately. ECG analysis requires compatible smartwatch with ECG capability. ## Key features - Advanced arrhythmia detection (AFib, PAC, PVC, Bigeminy, Trigeminy) - Comprehensive HRV analysis with 12+ professional metrics - AI-powered explanations of ECG results - Professional PDF reports for cardiologists - Seamless Apple Health integration - 100% privacy-first, local data analysis ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Premium Yearly | $59.99 | per year | | Premium Weekly | $7.99 | per 7 days | | Premium Family Yearly | $79.99 | per year | | Premium Monthly | $9.99 | per month | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Premium Lifetime | $179.99 | one-time | | Premium Family Lifetime | $269.99 | one-time | ## Chart rankings - #143 in Top Grossing · Medical (US App Store) ## Recent user reviews (10 of 11) All indexed reviews: https://appshunter.io/ios/app/heartlab-ecg-and-heart-analysis/id6757519025/reviews.md ### 1/5 — 典型的老中医开西药，瞎忽悠➕不诚实 *2026-07-26* 一看就是AI写的，才上线就说分析了70万，这瞎话编的，做健康应用还这么不诚实，吓人不？328块一年你敢买？ **Developer response:** 感谢您的反馈。针对您提出的几点，现说明如下。 一、关于开发团队 HeartLab 由 CEPALabs SH.P.K. 开发并运营，团队现有 12 名成员，并与欧洲多所医院及大学的心血管科室保持长期合作。应用内的全部文案以及本条回复，均由团队成员撰写。 二、关于分析方法 应用中的每一项指标均基于公开发表的临床方法。QTc 采用 Bazett、Fridericia、Framingham 三种公式并行计算；心率变异性指标（SDNN、rMSSD、pNN50）遵循 ESC/NASPE 工作组 1996 年发布的测量标准。上述文献均可公开查阅。 三、关于"70 万"这一数据 该数据的统计单位为心电图份数，而非用户数量。HeartLab 会将您 Apple Watch 中的历史心电图完整导入并逐份分析，单一用户的记录量通常在数百至数千份之间，我们创始人本人的设备上即存有 7000 余份。按份数累计，该量级并不需要 70 万名用户。 另需说明：全部分析均在您的设备本地完成，我司服务器不接收、也无法读取您的心电图数据。 四、关于价格 328 元／年，折合每月不足 28 元，且分析次数不设上限。就功能覆盖范围而言，这是同类产品中的最低定价。 HeartLab 目前提供完整的心率变异性分析（SDNN、rMSSD、pNN50、庞加莱散点图）、多公式 QTc 计算、R 波识别与心律异常检测、心脏评分与长期趋势对比，以及可直接提交给医生的 PDF 报告。据我们了解，目前尚无同类应用在功能完整度上与之相当。后续还将陆续发布多项重要更新。 如您还有其他问题或建议，欢迎随时与我们联系： 邮箱：hello@heartlab.it WhatsApp：+39 379 234 5841 感谢您帮助我们让 HeartLab 变得更好。 Sara 您的 HeartLab 支持团队 ### 3/5 — Tolle Erfindung, aber noch weiter für Laien ausbaufähig. Da ist noch Potential nach oben. *2026-07-14* Zu Beginn hat die KI Chat Funktion so gar nicht funktioniert. Mittlerweile funktioniert es wenigstens ein bisschen. Die einzelnen EKGs als pdf als Anhang per Mail senden ist eine gute Erfindung, nur kann ich einer kardiologischen Praxis ja nicht 50 einzelne Emails senden. Da wäre eine Verbesserung für die Zukunft echt eine gute Idee. An sich aber eine gute Erfindung, Übungen für Menschen, die einfach mal einen Überblick bekommen wollen über EKG Werte und Übungen zur Stress Reduktion ausprobieren wollen. Ich kenne die Blubbern leider schon, daher ist es jetzt nichts super aufregend Neues, was mir nachhaltig geholfen hat. Ein Update mit mehr Innovation, neuen und abwechslungsreicheren Übungen wäre ratsam. Auch mehr Legenden zu den abkürzen. Man kann zwar Teilnahme Abkürzungen anklicken und einen Satz zur Erklärung lesen, aber als Laie ist es nicht leicht zu wissen, welche EKGs man dann zum kardiologischen Facharzttermin mitnehmen. Sol, denn diese erwartet bei mir, dass sie im Vorfeld schon EKGs per E-Mail pdf erhält. Man kann EKGs spenden für die Forschung. Zu welcher Forschung und wo genau geben die Daten dann hin? Welche Uni? Welches Projekt? Darüber will ich gerne mehr erfahren. **Developer response:** Vielen Dank für Ihr ausführliches und wertvolles Feedback, besonders für Ihre großartige Idee, mehrere EKGs auszuwählen und als eine einzige PDF-Datei zu versenden. Genau diese Funktion werden wir implementieren und so schnell wie möglich veröffentlichen. Aktuell arbeiten wir an einem sehr wichtigen Update, das in Kürze erscheinen wird. Unser Ziel ist es, jeden Aspekt der App weiter zu verbessern, um eine noch klarere, verständlichere und wirklich hilfreiche Erfahrung für alle Nutzer zu schaffen. In den kommenden Updates werden auch viele neue und abwechslungsreichere Übungen eingeführt, die zusätzlich personalisiert auf den jeweiligen Nutzer abgestimmt sind. Außerdem werden wir die Erklärungen zu den Abkürzungen erweitern und klarer gestalten, damit auch medizinische Laien besser verstehen können, welche EKGs für einen Termin beim Kardiologen relevant sind. Wir arbeiten zudem daran, gezielter Hinweise zu geben, welche Aufzeichnungen aus Vorsorge- oder Sicherheitsgründen überprüft werden sollten. Zum Thema Datenspende: Der gesamte Prozess ist vollständig anonymisiert, automatisiert und verschlüsselt. Die gespendeten EKGs enthalten ausschließlich Rohdaten sowie optional angegebene Symptome – keinerlei persönliche Informationen oder Zuordnung zu einer Identität. Die Daten werden auf sicheren, isolierten Servern gespeichert. Nutzer können ihre gesendeten Daten jederzeit löschen; in diesem Fall werden diese auch vollständig von unseren Servern entfernt. Jedes EKG wird anschließend anonym an drei unabhängige Kardiologen weitergeleitet. Stimmen mindestens zwei Diagnosen überein, gelangt das EKG in eine weitere Validierungsstufe durch einen vierten Kardiologen. Wird die Diagnose nicht bestätigt, geht der Datensatz mit allen Anmerkungen zurück in die erste Phase. Bestätigte EKGs werden anschließend von unseren Signalverarbeitungs-Ingenieuren geprüft und für die Weiterentwicklung unserer Algorithmen verwendet. Derzeit umfasst unsere Datenbank über 60.000 EKGs von rund 2.000 Personen. Davon wurden bereits etwa 10.000 EKGs von ca. 400 Personen vollständig analysiert, validiert und in unser System integriert. Unser Ziel ist es, die Genauigkeit unserer Algorithmen kontinuierlich zu verbessern, um die Prävention zu stärken und im besten Fall Leben zu retten. Wir arbeiten hierbei unter anderem mit folgenden Institutionen zusammen: Careggi Universitätsklinik (Italien), San Raffaele (Italien), Universität Tirana und Universität Zürich. Alle Partner erhalten ausschließlich anonymisierte Rohdaten und dürfen diese weder für andere Zwecke verwenden noch weitergeben. Falls Sie weitere Fragen oder Anregungen haben, können Sie uns jederzeit gerne kontaktieren: E-Mail: hello@heartlab.it WhatsApp: +39 3792345841 Vielen Dank, dass Sie uns helfen, HeartLab stetig zu verbessern. Sara, Ihr HeartLab Support Team ### 1/5 — Oh boy this AI is so terribly wrong *2026-06-09* Save your time to talk to a real doctor, seriously **Developer response:** Thank you for the feedback — and you're right about one thing: nothing replaces a real doctor. HeartLab is built on that principle. One small clarification: your ECG measurements (rhythm, heart rate, intervals) don't come from AI, they're computed by validated signal-processing algorithms. The AI feature is an optional assistant that simply explains those results in plain language, and it's designed for education, never diagnosis. If a specific result looked wrong, we'd genuinely like to look into it, please write to us at hello@heartlab.it with the recording in question. Reports like yours directly improve the app. Sara, HeartLab Support ### 1/5 — Not very good *2026-05-13* I have a heart condition and This ECG app missed poss long QT Triplets PVC PAC Cuplets PVC/ PAC. Bigamey 7 PVC in one ECG so will not be Renewing as not very good at all. **Developer response:** Hi MWR, thanks for taking the time to write this. We want to give you an honest answer rather than a generic one. What you describe is unusual for HeartLab. Our detection pipeline is tuned to be more sensitive than specific, which means that in practice it tends to over-flag ectopic activity (couplets, bigeminy, PVCs, PACs) rather than miss it. Users with a known arrhythmia profile usually tell us the opposite of what you experienced. So either the recording had signal quality issues that limited the analysis, or there's a specific case we'd really like to look at. If you're open to it, please send the ECG export to hello@heartlab.it. We'll review it personally with our team, and if the app genuinely missed what you describe we'll treat it as a priority case. A real recording from someone who already knows what's there is far more useful to us than any synthetic test, and it's exactly how we keep improving the PVC and PAC pipeline. Thanks, The HeartLab team ### 1/5 — $50 for an AI “invented” app *2026-05-09* Not against ai but its crazy so many new AI vibe apps asking this much money for some fancy aka dumb “invented” concept **Developer response:** HeartLab is not an AI gimmick app. It's the work of a team of 13 people, built in collaboration with cardiologists from Italian hospitals who validated every algorithm we use: • Arrhythmia detection (PAC, PVC, AFib, bigeminy, trigeminy) • Full HRV analysis with 12 metrics including SDNN, rMSSD, pNN50, Poincaré • QT and QTc measurement using the Postema tangent method, the clinical standard used in hospitals • Beat Signature analysis and Cardiac Score • Professional PDF reports for your doctor All of it processed on device. Your ECG data never leaves your phone. The optional AI assistant only ever receives anonymized numerical summaries, never raw ECG data. It's one feature, not the product. Premium costs €49.99 a year, less than a single Holter monitor exam. If you've actually tried the app and have specific feedback, write to hello@heartlab.it. We read and reply to every message. Marta, HeartLab Support ### 1/5 — Way off, don’t bother *2026-05-05* Saying as a retired paramedic: this is not supposed be approved at all, causing harm to patients with terribly wrong readings. Funny enough the seller’s comment about ecg machines, which I had used many, confirms my suspicion that this likely, is made by a rookie, amateur at most, and the real harm is to those who cannot tell, which is the only reason i bother to leave this review **Developer response:** Hi Artemis-4, thanks for taking the time to write this. Feedback from people with a clinical background is something we genuinely care about, even when it's harsh. Just a couple of points worth clarifying. HeartLab is a wellness and screening app, not a diagnostic medical device. We say this clearly inside the app and on our website. The goal is to help people notice patterns and bring useful information to their doctor, not to replace a clinical evaluation. The algorithms are developed by our biomedical engineers and validated together with cardiologists here in Italy and researchers from a few universities we collaborate with. Every study and reference we rely on is public, both on our website and inside our Discord community. Anyone can read the methodology and check the sources. If you have a specific ECG that gave you a reading you believe was wrong, please send it to hello@heartlab.it. We read every email and we use real cases to keep improving the app. A paramedic's perspective on a concrete trace would actually be very useful to us. To be transparent with anyone reading this: in the past weeks we've been receiving a coordinated wave of 1-star reviews coming from beta testers of a competing app, clearly aimed at damaging our reputation rather than discussing the product. We sincerely hope your review isn't part of that pattern, and if it isn't we apologize for even mentioning it. In any case, we're working with Apple to identify and report bad-faith reviews, and we feel users deserve to know this is happening. We take this kind of responsibility seriously, and we're always open to honest scrutiny. We just want readers of this review to have the full picture of what HeartLab is, what it isn't, and the context we're operating in. Thanks again, The HeartLab team ### 1/5 — Horrible app and experience *2026-04-25* This is a poor copy of ECG+. I’ll use the original app instead. **Developer response:** Hi, thanks for the feedback. We have to address this one openly because it touches a topic many of our users have started asking about. HeartLab is not a copy of any other app. Our development timeline, design files and code commits are fully documented and predate several of the features we're now being compared to. We're a small independent team, building this product since long before the comparison you mention even existed in its current form. For full transparency: in recent weeks we've been receiving a coordinated wave of 1-star reviews on different App Store regions, all dismissive, generic, and pointing users toward the same competing app. We sincerely hope your review is genuine, and if it is we apologize for even mentioning this. But the pattern is clear enough that we feel users deserve to know about it. We're working with Apple to review these cases, and we welcome any honest feedback from real users. If you've actually used HeartLab and something specific didn't work for you, please write to hello@heartlab.it and we'll look into it personally. Every clinical study and methodology behind our algorithms is public on our website and on our Discord community, so anyone can verify what we do and how. Thanks, The HeartLab team ### 1/5 — Check ECG+ *2026-04-22* The developer asked me to be constructive so here is one: RESPECT other apps work, you can get inspired but straight up copyying discredits whatever you are offering… evidence? Look at the 2nd screenshot showing an ecg strip, the navigator with letter R for easy locating beats is nearly identical to ecg+, yeah of course you can change color from red to purple but the way it works is IDENTICAL. In case Apple is checking, compare element by element on the screenshot, even the grayed out text of Apple Watch device info is in the same position. I don’t work for anyone but decent enough to call out dishonesty and unfairness **Developer response:** Edit: the "navigator with R letter" is the standard convention for R-peak annotation used in clinical ECG analysis since the 1960s and across medical-grade devices. The position of Apple Watch device metadata is determined by standard iOS layout patterns. These are not proprietary design choices. Thank you for taking the time to share your thoughts. We take feedback seriously, but we want to clarify that HeartLab is an independently developed product built around its own ECG analysis workflow, AI-assisted interpretation, HRV metrics, and report generation features. Our goal is to help users better understand their heart data, not simply to imitate existing apps. Some visual patterns in ECG applications are naturally similar because they all present the same kind of physiological data, but similarity in how information is displayed does not mean the product or analysis engine was copied. The underlying experience, feature set, and analysis approach in HeartLab are designed from the ground up for our users. If you have specific concerns about any feature or screen, we would be glad to review them directly. Constructive feedback is always welcome, but broad claims of copying without evidence are not helpful to users who are trying to evaluate the app fairly. ### 5/5 — All good thanks *2026-03-08* I have over 5k ecgs accumulated over the past 5 years and still the app works very well **Developer response:** Thank you so much for your feedback! We're really glad to hear that HeartLab is still working well for you even after collecting over 5,000 ECGs over the past 5 years. Your support means a lot to us and motivates us to keep improving the app. ### 1/5 — Completely inaccurate! Junk. *2026-03-05* This is completely inaccurate and a scam to make money. I took this with me to the cardiologist and ran an analysis at the same time and it was 100% wrong in every area of analysis. **Developer response:** Thank you for your feedback. HeartLab is not intended to replace a cardiologist or a clinical diagnosis. Our algorithms are developed using validated ECG databases that have been reviewed and annotated by cardiologists, and the app is designed to provide automated insights based on single-lead ECG recordings from supported devices. That said, we take feedback like this very seriously and would genuinely like to understand what happened in your specific case. Signal quality, device positioning, and recording conditions can sometimes affect automated analysis, so reviewing the original ECG can help us investigate and improve the system. Please feel free to contact us so we can look into your case together: Email: hello@heartlab.it WhatsApp: +39 379 234 5841 Our goal is not to mislead users. In fact, most features in HeartLab are completely free, and the premium option is priced among the lowest in the market while offering a wide range of advanced analysis features. User feedback helps us continuously improve the app, and we would truly appreciate the opportunity to review your recording and clarify the situation. ## Frequently asked questions about HeartLab ### What heart rhythm irregularities can HeartLab detect? HeartLab can detect five types of heart rhythm irregularities: Atrial Fibrillation (AFib), Premature Atrial Contractions (PAC), Premature Ventricular Contractions (PVC), Bigeminy, and Trigeminy. This goes beyond basic apps that may only identify AFib. ### How does HeartLab explain complex medical terms? HeartLab features an AI assistant that explains your ECG results in plain language, answering your questions and clarifying what your heart data means. This helps users understand the 'squiggly lines' without medical jargon. ### Can I share my HeartLab ECG analysis with my doctor? Yes, HeartLab generates professional PDF reports that include complete ECG waveform visualization, all measurements, HRV metrics, detected anomalies, and historical comparisons. Many cardiologists recognize and trust this report format. ### How does HeartLab handle my personal health data? HeartLab is 100% privacy-first, meaning your ECG data never leaves your iPhone. All analysis is performed locally on your device with no cloud processing, data uploads, or accounts required. ### What Heart Rate Variability (HRV) metrics does HeartLab provide? HeartLab offers 12+ professional HRV metrics, including SDNN, rMSSD, pNN50, Poincaré Plot, and a proprietary Cardiac Score. These are the same metrics used in professional cardiac research. ### Does HeartLab integrate with other health platforms? Yes, HeartLab offers seamless integration with Apple Health, automatically importing ECG data. This eliminates manual export or complicated setup, allowing you to see analysis in seconds. ### What devices is HeartLab compatible with? HeartLab is designed for use on iPhones and iPads. It requires a smartwatch that records ECGs to import data for analysis. ### How often is HeartLab updated? The latest version of HeartLab is 1.1.3, which was last updated on March 27, 2026. This indicates a commitment to ongoing development and improvements. ## Version history (last 5 releases) ### 1.1.6 — 2026-08-20 Thank you. Truly. HeartLab got this far because of the people who use it every day and take the time to tell us what works and what doesn't. We read every message. What's new: • Family plan — share HeartLab with up to 6 people you care about, on a single subscription • Lifetime plan — pay once and it's yours forever, no renewals • Bug fixes and stability improvements And this is only the beginning: we're working on major updates that will make HeartLab far more advanced and complete. They're coming soon. Thank you for trusting us. Keep writing to us — that's how the app gets better. — The HeartLab team ### 1.1.5 — 2026-05-13 • Refreshed app icon • Improved ECG detail readability • Tap the HRV chart to navigate your ECG trace • Onboarding improvements • Localization updates across supported languages • Various bug fixes and stability improvements Thank you for choosing HeartLab! ### 1.1.4 — 2026-04-02 Thank you for choosing HeartLab! This update brings personalized HRV analysis and a completely overhauled PDF report. Personalized HRV - Choose between rMSSD and SDNN in Settings — your preference is applied everywhere - Age-adjusted HRV thresholds: evaluation adapts to your age group (6 ranges: 18-29 to 70+) - Fixed HRV showing 0 ms in recordings with isolated PVCs PDF Report Overhaul - Beat Signature now included: median beat waveform with P/QRS/T shading and 6 interval measurements - Patient age and sex now correctly displayed in the report header - HRV evaluation matches your app settings (method + age-adjusted thresholds) - QTc assessment is now sex-aware (AHA/ESC guidelines) - Added QTc (Bazett), Couplets, T-Wave Inversions, LF/HF ratio, ectopic load % - Stress score formula aligned with the app (logarithmic, 5 categories) - Removed non-clinical Health Score — cleaner, more trustworthy report - Optimized Page 2 layout: no overlaps, all sections fit perfectly Bug Fixes - Fixed HRV toggle not responding (replaced with segmented Picker) - One-shot migration resets HRV method to rMSSD for existing users We read every review — thank you for your support! ### 1.1.3 — 2026-03-27 Thank you for using HeartLab! This update brings major improvements to accuracy, design, and reliability. ECG Analysis v25 - Completely rewritten beat selection algorithm — prioritizes beats with clear P-wave and T-wave for more accurate measurements - QT measurement accuracy improved: 76% of measurements now within 30ms of manual annotation (was 58%) - False Long QTc alerts reduced from 19 to just 1 — 4-layer protection system prevents tangent overshoot - QTc now always displayed when the beat signature calculates it successfully - Improved P-wave, T-wave onset, and J-point detection Redesigned Interface - New card design throughout the app - Beat Signature view with better zoom balance — P and T waves now clearly visible - Tangent line visualization matches the analysis algorithm exactly - Signal Quality banner removed from detail view (info already in rhythm card) - New HRV tab with Poincare plot and R-R/HR charts - Redesigned Stress Card with segmented gauge New Features - Manual QT adjustment: drag markers to fine-tune QT measurement - CSV export with 21 data fields - Smart ECG search by date or classification - Social links in Profile Privacy & AI - AI consent popup now clearly states your data is analyzed anonymously - Consent can be managed directly from the AI chat menu - No personally identifiable information is ever shared with OpenAI Bug Fixes - Fixed crash risk in Beat Signature with invalid cached indices - Fixed data race in multi-beat QT measurement - Fixed gradient division by zero in R-peak detection - Updated translations across all 18 supported languages We read every review — thank you for your feedback and support! ### 1.1.2 — 2026-03-25 Thank you for using HeartLab! This update brings major improvements to accuracy, design, and reliability. ECG Analysis v25 - Completely rewritten beat selection algorithm — prioritizes beats with clear P-wave and T-wave for more accurate measurements - QT measurement accuracy improved: 76% of measurements now within 30ms of manual annotation (was 58%) - False Long QTc alerts reduced from 19 to just 1 — 4-layer protection system prevents tangent overshoot - QTc now always displayed when the beat signature calculates it successfully - Improved P-wave, T-wave onset, and J-point detection Redesigned Interface - New card design throughout the app - Beat Signature view with better zoom balance — P and T waves now clearly visible - Tangent line visualization matches the analysis algorithm exactly - Signal Quality banner removed from detail view (info already in rhythm card) - New HRV tab with Poincare plot and R-R/HR charts - Redesigned Stress Card with segmented gauge New Features - Manual QT adjustment: drag markers to fine-tune QT measurement - CSV export with 21 data fields - Smart ECG search by date or classification - Social links in Profile Privacy & AI - AI consent popup now clearly states your data is analyzed anonymously - Consent can be managed directly from the AI chat menu - No personally identifiable information is ever shared with OpenAI Bug Fixes - Fixed crash risk in Beat Signature with invalid cached indices - Fixed data race in multi-beat QT measurement - Fixed gradient division by zero in R-peak detection - Updated translations across all 18 supported languages We read every review — thank you for your feedback and support! ## Apps similar to HeartLab | App | Rating | Price | Category | | --- | --- | --- | --- | | [ECG AI](https://appshunter.io/ios/app/ecg-ai/id1557660272) | 1.0 (2) | Free | Medical | | [Watch ECG Pro - Deep Analysis](https://appshunter.io/ios/app/watch-ecg-pro-deep-analysis/id1542744328) | 4.5 (62) | Free | Medical | | [FibriCheck US](https://appshunter.io/ios/app/fibricheck-us/id6514316470) | — | Free | Medical | | [ECG Buddy](https://appshunter.io/ios/app/ecg-buddy/id1632339964) | 5.0 (1) | Free | Medical | | [ECG Tracker+ EKG Reader HRV](https://appshunter.io/ios/app/ecg-tracker-plus-ekg-reader-hrv/id6758300705) | 3.6 (19) | Free | Medical | ## Related topics [heart arrhythmia](https://appshunter.io/ios/topics/heart-arrhythmia) --- *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 2026-09-07.*