# SIYC App vs HRV4Biofeedback

The clearest difference is price: SIYC App at Free against HRV4Biofeedback's $9.99. SIYC App also leads on rating (5.0 vs 3.4). HRV4Biofeedback's advantage is update cadence (every 2 months vs every 13 months) and ratings volume (29 vs 2). On ads, in-app purchases, monetization model and device support there is nothing between them.

SIYC App is free to download; HRV4Biofeedback costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SIYC App holds the better App Store score, 5.0 against 3.4. That said, the two scores are not equally well evidenced: HRV4Biofeedback has 29 ratings behind it against 2, so its average is the more settled of the two.

SIYC App ships an update every 13 months, HRV4Biofeedback every 2 months. The most recent releases landed on October 8, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | SIYC App | HRV4Biofeedback |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/siyc-app/id635128549/reviews)** | [3.4 (29 ratings)](https://appshunter.io/ios/app/hrv4biofeedback/id1504638613/reviews) |
| Number of ratings | 2 | **29** |
| Positive reviews | — | 53.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 months** |
| Monetization | Free | Free |
| Best chart rank | — | **#41** |
| Size | 20 MB | 138 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Michael Marley](https://appshunter.io/developer/635128552) | [A.S.M.A. B.V.](https://appshunter.io/developer/1066843463) |

## What reviewers say

### SIYC App

[App page](https://appshunter.io/ios/app/siyc-app/id635128549)

Access club announcements, upcoming events, and essential marine data for Long Island Sound. Stay informed about club news and facts.

**Highlights:** Club announcements, Club events calendar, Weather and tide data, Buoy data for Long Island Sound, Club facts and news

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### HRV4Biofeedback

[App page](https://appshunter.io/ios/app/hrv4biofeedback/id1504638613)

**Currently charting:** #41 Top Paid · Lifestyle (US App Store)

This app uses your phone's camera to measure heart rate variability and provide biofeedback. It guides you through deep breathing exercises to improve self-regulation and manage stress. Track your progress and explore correlations with your daily experiences.

**Highlights:** Camera-based HRV measurement, Real-time heart rate feedback, Resonant frequency analysis, Biofeedback score, Subjective annotations, HealthKit integration, Bluetooth sensor support

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SIYC App free?

SIYC App is free to download, with no in-app purchases.

### Is HRV4Biofeedback free?

HRV4Biofeedback costs $9.99, with no in-app purchases.

### Which has better reviews, SIYC App or HRV4Biofeedback?

SIYC App is rated higher. SIYC App averages 5.0 out of 5 from 2 ratings, while HRV4Biofeedback averages 3.4 from 29 ratings.

### Do SIYC App or HRV4Biofeedback have ads?

Neither SIYC App nor HRV4Biofeedback shows ads.

### Which is updated more often, SIYC App or HRV4Biofeedback?

SIYC App ships an update every 13 months, and HRV4Biofeedback every 2 months. Most recently, SIYC App was updated on October 8, 2026 and HRV4Biofeedback on October 17, 2026.

---

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