Comparison

iOX vs Flutter

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Noninvasive SpO2 tracking
  • Heart rate monitoring
  • Perfusion index tracking
  • Plethysmograph display
  • Programmable alarms
  • One-click CSV data export
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

iOX3 screens
Flutter4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Flutter sells 3 in-app purchases, starting at $14.99 per month. iOX asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
iOX versus Flutter: the parameters behind the verdict, then further details
ParameteriOXFlutter
PriceFreeFree
Rating2.8 (15 ratings)5.0 (2 ratings) — better
Positive reviews35.0% of reviews100.0% of reviews — better
Number of ratings15 — better2
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPodiPhone, Apple Watch
Requires iOS12.0 — better17.6
Further details — not scored
Size6 MB21 MB
Age rating17+4+
DeveloperNet 1688, Inc.CYBERIAN TECHNOLOGIES LLC

Customer experience

iOX

All ratings15 ratings
Positive46.7%
Neutral6.7%
Negative46.7%
Written reviews20 reviews
Positive35.0%
Neutral0.0%
Negative65.0%

Flutter

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

iOX

No in-app purchases

3 purchases

Flutter

Subscriptions3
  • 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

Questions

Is iOX free?
iOX is free to download, with no in-app purchases.
Is Flutter free?
Flutter is free to download, with in-app purchases available.
Which has better reviews, iOX or Flutter?
Flutter is rated higher. iOX averages 2.8 out of 5 from 15 ratings, while Flutter averages 5.0 from 2 ratings.
Do iOX or Flutter have ads?
Neither iOX nor Flutter shows ads.
Which is updated more often, iOX or Flutter?
iOX ships an update every 2 months, and Flutter every 3 weeks. Most recently, iOX was updated on October 2, 2026 and Flutter on September 22, 2026.

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