iOX vs Flutter
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.
Flutter
Experience your heartbeat as a live haptic sensation on your wrist. Connect with loved ones by sharing real-time heartbeats, fostering a sense of presence and intimacy across any distance. Choose from various haptic styles for a personalized and calming experience.
- Live haptic heartbeat feedback on Apple Watch
- Solo Sync for personal awareness
- Partner Sync for sharing with others
- Real-time BPM display
- Multiple haptic pulse styles
- Invite-based partner pairing
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Flutter lets you feel a heartbeat directly on your wrist through Apple Watch. Designed for calm, focused awareness, Flutter turns heartbeat into a live haptic experience you can physically feel in real time. During a session, Flutter reads heart rate, displays BPM clearly, and translates each beat into a precise pulse on your wrist. Different haptic styles let you choose the sensation that feels most comfortable or meaningful. Flutter includes Solo Sync for personal heartbeat awareness and Partner Sync for sharing live heartbeats with someone you care about. Couples, friends, and family can connect through invite-based sessions and experience real-time heartbeats together, creating a simple and intimate way to stay connected across any distance. Sessions are easy to start and stop, with a minimal interface designed to stay out of the way and keep attention on rhythm, presence, and connection. Features • Solo Sync for personal heartbeat awareness • Partner Sync for sharing live heartbeats with another person • Real-time heart rate (BPM) display • Live haptic heartbeat feedback on Apple Watch • Multiple haptic pulse styles • Invite-based partner pairing • Minimal, distraction-free interface • Account deletion from the Profile screen Flutter is a quiet, modern way to feel rhythm, presence, and connection. • Privacy Policy: https://flutter.cyberian.tech/privacy.html • Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is review sentiment: Flutter at 100% against iOX's 35%. Flutter also leads on rating (5.0 vs 2.8) and update cadence (every 3 weeks vs every 2 months). iOX's advantage is in-app purchases (none vs 3) and ratings volume (15 vs 2). 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. Flutter sells 3 in-app purchases, starting at $14.99 per month. iOX asks for nothing beyond the download.
Flutter holds the better App Store score, 5.0 against 2.8. That said, the two scores are not equally well evidenced: iOX has 15 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 35% of iOX's written reviews are positive against 100% of Flutter's.
iOX ships an update every 2 months, Flutter every 3 weeks. The most recent releases landed on October 2, 2026 and September 22, 2026 respectively.
| Parameter | iOX | Flutter |
|---|---|---|
| Price | Free | Free |
| Rating | 2.8 (15 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 35.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 15 — better | 2 |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Subscription |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 6 MB | 21 MB |
| Age rating | 17+ | 4+ |
| Developer | Net 1688, Inc. | CYBERIAN TECHNOLOGIES LLC |
Customer experience
iOX
Flutter
In-app purchases
iOX
No in-app purchases
Flutter
- Partner Sync (Monthly)7 Days trial$14.991 Month
- Partner Sync Quarterly7 Days trial$39.993 Months
- Partner Sync Annual7 Days trial$119.991 Year









