Comparison

Flutter vs SightFrame

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

Head to head
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/

About

SightFrame

Features
Read full description

SightFrame is an interactive vision simulator and eye-care educational tool. Using advanced real-time image processing, SightFrame allows you to see the world through the perspective of individuals with myopia, astigmatism, presbyopia, and color vision deficiencies. KEY FEATURES: 1. Real-Time Camera Simulation • Live Diopter Control: Adjust spherical power from 0 to -10.0D+ to observe realistic distance defocus. • Astigmatism Effects: Directional blur, streaks, and double-vision glare—especially in low-light environments. • Presbyopia Mode: Central focus difficulty simulating age-related near vision loss. • Color Deficiency Filters: Protanopia, Deuteranopia, and Tritanopia color matrix transformations. 2. Realistic Preset Scenes • Explore common everyday environments like night driving, classroom blackboards, metro signs, and rainy streetscapes. • Switch effortlessly between clear vision and simulated refractive errors. 3. Split-Screen Comparison & Fine Tuning • Compare side-by-side (Split View) between normal vision and simulated filters. • Fine-tune blur radius, halo intensity, pupil distance, and astigmatism axis angles. 4. Standard Eye Chart • Interactive Tumbling E / Snellen chart for eye test exploration and vision awareness. 5. Privacy & Clean Experience • 100% On-Device Processing: Camera feed is rendered locally in real time. We NEVER record, save, or upload your photos or videos. • No Ads: Enjoy an uninterrupted, seamless visual journey. DISCLAIMER: SightFrame is intended for educational, empathy, and simulation purposes only. It does not provide medical diagnoses or replace professional eye examinations. For any vision concerns, please consult a certified optometrist or ophthalmologist. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Flutter4 screens
SightFrame4 screens

Verdict

The call

The clearest difference is in-app purchases: SightFrame at none against Flutter's 3. SightFrame also leads on update cadence (every 5 days vs every 3 weeks) and iOS requirement (15.0 vs 17.6). 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. SightFrame asks for nothing beyond the download.

UpkeepUpdate frequency

Flutter ships an update every 3 weeks, SightFrame every 5 days. The most recent releases landed on October 9, 2026 and October 11, 2026 respectively.

Scorecard3 real differences · 7 level
Flutter versus SightFrame: the parameters behind the verdict, then further details
ParameterFlutterSightFrame
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 3 weeksEvery 5 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationSubscription—
DevicesiPhone, Apple WatchiPhone, iPad, iPod — better
Requires iOS17.615.0 — better
Further details — not scored
Size21 MB32 MB
Age rating4+12+
DeveloperCYBERIAN TECHNOLOGIES LLC书同 田

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
None

SightFrame

No in-app purchases

Questions

Is Flutter free?
Flutter is free to download, with in-app purchases available.
Is SightFrame free?
SightFrame is free to download, with no in-app purchases.
Do Flutter or SightFrame have ads?
Neither Flutter nor SightFrame shows ads.
Which is updated more often, Flutter or SightFrame?
Flutter ships an update every 3 weeks, and SightFrame every 5 days. Most recently, Flutter was updated on October 9, 2026 and SightFrame on October 11, 2026.

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