# Flutter vs SightFrame

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.

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

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.

## The numbers

| Metric | Flutter | SightFrame |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/flutter-heartbeat-sync-app/id6758436973/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Subscription | — |
| Size | 21 MB | 32 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [CYBERIAN TECHNOLOGIES LLC](https://appshunter.io/developer/1872937842) | [书同 田](https://appshunter.io/developer/6779253249) |

## What reviewers say

### Flutter

[App page](https://appshunter.io/ios/app/flutter-heartbeat-sync-app/id6758436973)

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:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Partner Sync (Monthly) | $14.99 | per month |
| Partner Sync Quarterly | $39.99 | per 3 months |
| Partner Sync Annual | $119.99 | per year |


### SightFrame

[App page](https://appshunter.io/ios/app/sightframe-vision-simulator/id6794273566)

**Features:** Family Sharing

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*