Comparison

SIYC App vs HRV4Biofeedback

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

Head to head
About

SIYC App

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
Read full description

This app was developed for Sprite Island Yacht Club in Norwalk, CT. It provides information on - club announcements - club events - weather, tide and buoy data in Long Island Sound - club facts and news

About

HRV4Biofeedback

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
Currently charting
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Improve self-regulation and better cope with stress using HRV4Biofeedback, the camera-based Heart Rate Variability (HRV) Biofeedback app APP FEATURES: > camera-based biofeedback measurement showing real-time heart rate > spot check measurements at rest > frequency power spectrum > biofeedback score to quantify the effectiveness of the practice in terms of deep breathing and duration > resonant frequency analysis to determine the optimal breathing rate for your sessions > semi-real time HRV analysis > alternative manual breathing rate configuration between 4.5 and 8.5 breaths / minute > subjective annotations, including up to 5 personalized questions > current streak > explore correlations between subjective annotations and biofeedback data > Integration with HealthKit (you can write heart rate, HRV and Mindful minutes) > weekly and monthly summaries > support for Bluetooth sensors > background nature sounds > vibration to guide you through the practice WHAT'S BIOFEEDBACK? Heart Rate Variability (HRV) Biofeedback is a technique that can directly affect physiological and psychological factors through deep breathing exercises and is an ideal strategy to help us self-regulate and better cope with stressful situations​ Practically speaking, HRV Biofeedback consists of providing an individual with real-time feedback on instantaneous heart rate and respiration changes while being instructed to breathe at low frequencies You can learn more about the psychological and physiological benefits of deep breathing and HRV Biofeedback, at HRV4Biofeedback.com HOW CAN I BENEFIT FROM BIOFEEDBACK? Life can be demanding, from both a physical and psychological point of view ​Our health and performance can be affected by how we are able to effectively cope with stressful situations and deal with anxiety, or in broader terms, our ability to emotionally self-regulate is key The goal of HRV Biofeedback is to improve self-regulation, therefore impacting positively our health and performance LEARN MORE: - App features: https://www.hrv4biofeedback.com/faq.html - An introduction to biofeedback: https://www.hrv4biofeedback.com/blog/a-primer-on-heart-rate-variability-biofeedback - How to use the camera measurement: https://www.hrv4biofeedback.com/blog/guidelines-and-best-practices-for-camera-based-measurements Supported devices for the camera measurement: iPhones 8 and onwards HRV4Biofeedback requires to register an account with your email address, so that your data can be backed up safely and retrieved in case anything happens (app issue, changing phone, etc.) The validation of the camera-based heart rate measurement is available here: https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods

Screenshots

SIYC App4 screens
HRV4Biofeedback4 screens

Verdict

The call

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.

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

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 6 level
SIYC App versus HRV4Biofeedback: the parameters behind the verdict, then further details
ParameterSIYC AppHRV4Biofeedback
PriceFree — better$9.99
Rating5.0 (2 ratings) — better3.4 (29 ratings)
Positive reviews—53.1% of reviews
Number of ratings229 — better
Update frequencyEvery 13 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
Best chart rank—#110 — better
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.615.6
Further details — not scored
Size20 MB138 MB
Age rating12+4+
DeveloperMichael MarleyA.S.M.A. B.V.

Customer experience

SIYC App

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

HRV4Biofeedback

All ratings29 ratings
Positive51.7%
Neutral20.7%
Negative27.6%
Written reviews32 reviews
Positive53.1%
Neutral15.6%
Negative31.3%

In-app purchases

None

SIYC App

No in-app purchases

None

HRV4Biofeedback

No in-app purchases

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.

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