iOX vs Cardiac Diagnosis
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iOX
This app helps manage your personal health by noninvasively tracking blood oxygenation, heart rate, and perfusion index. It features a plethysmograph display and programmable alarms for health alerts. Data can be easily exported for review.
- Noninvasive SpO2 tracking
- Heart rate monitoring
- Perfusion index tracking
- Plethysmograph display
- Programmable alarms
- One-click CSV data export
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iOX’s new integrated mobile app brings our products to life. It is designed to fit your lifestyle and assist in everyday health management. The iOX allows you to noninvasively track and trend blood oxygenation(SpO2), heart rate(HR), and perfusion index(PI) for sports and aviation use. iOX’s new integrated app empowers you to manage your personal health in an intuitive way, while keeping up with your busy life. This app features a plethysmograph display and programmable alarms to let you know when values are too high or too low. One-click export of the recorded data into a CSV file.
Cardiac Diagnosis
This app uses your phone's camera and LED to measure and analyze heart rate and heart rate variability through photoplethysmography. It provides real-time monitoring and allows you to save and view your health data in record and graph formats.
- Heart rate measurement via camera
- Heart rate variability analysis
- Real-time continuous monitoring
- Save and view measurement records
- Historical graph view
- Data deletion functionality
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Using the phone's camera and LED, photoplethysmography (PPG) is measured and analyzed from the finger to inform heart rate and heart rate variability and is used for health management purposes. When you place the tip of your index finger on the rear camera, the heart-shaped camera preview turns red, then click the start button to start measuring. Normal Measurement takes about 20 seconds, and Precision Measurement takes about 1 minute. Continuous Measurement can monitor heart rate and heart rate variability in real time. You can save measured values by clicking the save button on each measurement screen. Saved data can be viewed in the record list view, and you can view detailed data by clicking on the list. Data can be deleted by dragging it to the left in the list. Saved data can also be viewed in graph form in the history graph view. Disclaimer This app is not intended for medical use and is to be used only for general fitness and health purposes and is not a medical device. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is review sentiment: Cardiac Diagnosis at 100% against iOX's 35%. Cardiac Diagnosis also leads on rating (4.2 vs 2.8) and update cadence (every 3 weeks vs every 2 months). iOX's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price 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. Cardiac Diagnosis sells 4 in-app purchases, starting at $0.99 per month. iOX asks for nothing beyond the download.
Cardiac Diagnosis holds the better App Store score, 4.2 against 2.8. Both are backed by a comparable volume of ratings — 15 and 5 respectively. Written reviews point the same way: 35% of iOX's written reviews are positive against 100% of Cardiac Diagnosis's.
iOX ships an update every 2 months, Cardiac Diagnosis every 3 weeks. Both last shipped on October 24, 2026.
| Parameter | iOX | Cardiac Diagnosis |
|---|---|---|
| Price | Free | Free |
| Rating | 2.8 (15 ratings) | 4.2 (5 ratings) — better |
| Positive reviews | 35.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 15 — better | 5 |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 6 MB | 54 MB |
| Age rating | 17+ | 17+ |
| Developer | Safe Heart USA, Inc. | SUNG DO KIM |
Customer experience
iOX
Cardiac Diagnosis
In-app purchases
iOX
No in-app purchases
Cardiac Diagnosis
- Subscribe for 1 month$0.991 Month
- Subscribe for 3 months$1.993 Months
- Subscribe for 6 months$2.996 Months
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- Subscribe for 1 year$4.991 Year
