Heart Analyzer vs Blood Oxygen
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Heart Analyzer
Gain deep insights into your heart health using data from your Apple Watch. Visualize trends, analyze metrics like Cardio Recovery and Heart Rate Zones, and generate detailed PDF reports. Offers advanced features and privacy-focused data handling.
- Dashboard with daily summaries
- Visualized heart rate and health data charts
- Health vital trend assessment
- Cardio Recovery and Heart Rate Zone analysis
- Exportable PDF heart reports
- ECG data comparison
- HRV rMSSD and heart rate calibration
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Heart Analyzer helps you track Heart Rate, HRV, Resting Heart Rate, Cardio Recovery, Sleep and ECG trends using Apple Watch. Analyze your Health data with advanced charts, insights, Heart Reports, widgets and detailed heart analytics powered by Apple Health. Set your own high and low heart rate alerts, take control of your HRV data in the new HRV Center, and see your sleep in detail with multiple sessions, naps and time out of bed. ------------------------------------------------ ■ Simple PRIVACY ------------------------------------------------ ◎ No third party analytics ◎ No health data ever leaves your device ◎ No modifications to your health data ------------------------------------------------ ■ FEATURES ------------------------------------------------ ◎ The Dashboard - Where you can swipe between days, scroll through summaries and tap into the details ◎ Charts - Heart Rate and other Health data visualized through metrics and trends of any given day ◎ Insights - Effortlessly assess your Health Vital trends ◎ Heart Rate Alerts - Choose your own high and low heart rate limits, set mute times, and opt to be notified only on sustained changes ◎ HRV Center - Control the quality and context of the Heart Rate Variability data behind your trends ◎ Sleep - Multiple sleep sessions, naps and time out of bed, with your heart rate through the night ◎ Analytics Plus - Gain a unique understanding of important metrics such as Cardio Recovery, Heart Rate Zones and plenty more ◎ Heart Reports - Generate and export tailored PDFs including a large selection of metrics with custom timescales and password protection support ◎ Bookmarks - Highlight specific days of interest, make notes on relevant details ◎ Widgets - Interact with your Home Screen and track your Heart Rate, Resting Heart Rate trends and more at a glance ◎ ECGs - Compare and analyze data recorded by Apple Watch ◎ Advanced features - Including HRV rMSSD, Heart Rate Calibration, Custom Heart Rate Zones, Smart Heart Rate Recovery and more ------------------------------------------------ ■ APPLE WATCH ------------------------------------------------ ◎ A re-designed app showing your Heart Rate over the day ◎ Heart Rate Alerts on your wrist, with no complication needed on your watch face ◎ Charts with you on the go for Move, Exercise, Cardio Points, HRV, Blood Oxygen Saturation and Resting Heart Rate ◎ Workouts right on your wrist, tap into the detail as soon as you finish your exercise ◎ Customizable complications to keep you up to date with your Heart Rate and also support for Blood Oxygen Saturation, Heart Rate Variability and Resting Heart Rate trends HEALTH SUPPORT INCLUDES: - Heart Rate - Resting Heart Rate - Blood Pressure (Systolic & Diastolic) - Electrocardiogram (ECG/EKG) - Blood Oxygen Saturation (SPO2) - Cardio Fitness (VO2Max) - Heart Rate Variability (SDNN & rMSSD) - Respiratory Rate - Breathing Disturbances - Workouts - Sleep Times, Sessions & Naps - Heart Rate Recovery - Apple Fitness & Activity - High & Low Heart Rate Notifications Heart Analyzer Premium is available as an optional monthly or annual subscription. You can also choose a one-time Lifetime Access purchase. Payment will be charged to your Apple ID account. Subscriptions automatically renew unless cancelled at least 24 hours before the end of the current billing period. You can manage or cancel your subscription at any time in your App Store account settings. Additional Terms of Use: https://www.helixapps.co.uk/heart-analyzer-terms-of-use Please Note: - Heart Analyzer integrates with the Apple Health App to read your Heart Rate and other Health data - Heart Analyzer is available on iPad with iCloud sync for Apple Health data enabled. However, you still need an iPhone with a paired Apple Watch to generate Health data to display in Heart Analyzer - To get the most out of Heart Analyzer, an iPhone with a paired Apple Watch is required
Blood Oxygen
Measure your blood oxygen saturation levels directly from your wrist. This app helps you assess oxygen levels, understand how well your body is absorbing oxygen, and gain insights into your overall wellness. It records measurements for later review.
- On-demand blood oxygen measurements
- Periodic background measurements
- Overnight measurements
- Stores measurements in Health app
- Filter measurements by sleep or elevation
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With the Blood Oxygen app on Apple Watch Series 6 or later*, you can measure the blood oxygen saturation levels directly from your wrist. Using the blood oxygen sensor on Apple Watch, the Blood Oxygen app can help you assess oxygen levels in your blood and get insights into how well your body is absorbing oxygen and overall wellness. Features • Allows you to take on-demand blood oxygen measurements. • Performs periodic background measurements throughout the day and overnight if you wear your Apple Watch to sleep. • Stores all measurements in the Health app on iPhone, with the ability to filter and view measurements taken while asleep or in a high-elevation environment. *For models of Apple Watch purchased in the United States on or after January 18, 2024 with part numbers ending in LW/A, the Blood Oxygen data analysis is performed on iPhone, and results can be viewed in the Health app.
Screenshots
Verdict
The clearest difference is review sentiment: Heart Analyzer at 84% against Blood Oxygen's 20%. Heart Analyzer also leads on rating (4.7 vs 3.9) and update cadence (weekly vs every 9 months). Blood Oxygen's advantage is in-app purchases (none vs 7) and iOS requirement (14.0 vs 17.5). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Heart Analyzer sells 7 in-app purchases, starting at $3.99 per month. Blood Oxygen asks for nothing beyond the download.
Heart Analyzer holds the better App Store score, 4.7 against 3.9. That said, the two scores are not equally well evidenced: Heart Analyzer has 22K ratings behind it against 127, so its average is the more settled of the two. Written reviews point the same way: 84% of Heart Analyzer's written reviews are positive against 20% of Blood Oxygen's.
Heart Analyzer ships an update weekly, Blood Oxygen every 9 months. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.
| Parameter | Heart Analyzer | Blood Oxygen |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (22K ratings) — better | 3.9 (127 ratings) |
| Positive reviews | 84.2% of reviews — better | 20.0% of reviews |
| Number of ratings | 22K — better | 127 |
| Update frequency | Weekly — better | Every 9 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPod, Apple Watch |
| Requires iOS | 17.5 | 14.0 — better |
| Further details — not scored | ||
| Size | 54 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Helix Apps LTD | Apple |
Customer experience
Heart Analyzer
Blood Oxygen
Bugs and requests
Heart Analyzer
Reported bugs
3 issues- Premium features not working as expected
- Syncing issues between iPhone and Apple Watch
- Oxygen level tracking not functioning properly
Requested features
4 requests- Add blood pressure monitoring
- Allow generating reports for current month
- Improve ECG interpretation guidance
- Add option to customize Apple Watch complications
Blood Oxygen
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Heart Analyzer
- Monthly$3.991 Month
- Annual$24.991 Year
- Data Plus$9.99
- Reports Plus$9.99
- Analytics Plus$9.99
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- Complete Premium$24.99
- Lifetime Access$49.99
Blood Oxygen
No in-app purchases








