# HRV4Biofeedback vs Zukka

The clearest difference is price: Zukka at Free against HRV4Biofeedback's $9.99. Zukka also leads on rating (4.4 vs 3.4) and review sentiment (76% vs 53%). HRV4Biofeedback's advantage is chart position (#35 vs unranked). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

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

Zukka holds the better App Store score, 4.4 against 3.4. Both are backed by a comparable volume of ratings — 29 and 64 respectively. Written reviews point the same way: 53% of HRV4Biofeedback's written reviews are positive against 76% of Zukka's.

HRV4Biofeedback ships an update every 2 months, Zukka every 3 weeks. The most recent releases landed on October 25, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | HRV4Biofeedback | Zukka |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [3.4 (29 ratings)](https://appshunter.io/ios/app/hrv4biofeedback/id1504638613/reviews) | **[4.4 (64 ratings)](https://appshunter.io/ios/app/zukka/id6743448282/reviews)** |
| Number of ratings | 29 | **64** |
| Positive reviews | 53.1% of reviews | **75.8% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Best chart rank | **#35** | — |
| Size | 138 MB | 116 MB |
| Requires iOS | **15.6** | 16.2 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [A.S.M.A. B.V.](https://appshunter.io/developer/1066843463) | [Ihor Zhvanko](https://appshunter.io/developer/1802934002) |

## What reviewers say

### HRV4Biofeedback

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

**Currently charting:** #35 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


### Zukka

[App page](https://appshunter.io/ios/app/zukka/id6743448282)

This app displays real-time blood glucose data from continuous glucose monitoring (CGM) systems. It tracks glucose, insulin, and activity, offering widgets and Apple Health integration. It connects via Bluetooth to devices like Dexcom and FreeStyle Libre.

**Highlights:** Real-time glucose tracking, Insulin tracking, Activity and exercise logging, Widgets and watch app support, Apple Health integration, Bluetooth CGM connectivity

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is HRV4Biofeedback free?

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

### Is Zukka free?

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

### Which has better reviews, HRV4Biofeedback or Zukka?

Zukka is rated higher. HRV4Biofeedback averages 3.4 out of 5 from 29 ratings, while Zukka averages 4.4 from 64 ratings.

### Do HRV4Biofeedback or Zukka have ads?

Neither HRV4Biofeedback nor Zukka shows ads.

### Which is updated more often, HRV4Biofeedback or Zukka?

HRV4Biofeedback ships an update every 2 months, and Zukka every 3 weeks. Most recently, HRV4Biofeedback was updated on October 25, 2026 and Zukka on October 20, 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.*