# HRV Sync vs UltraVO2Max

The clearest difference is price: HRV Sync at Free against UltraVO2Max's $2.99. HRV Sync also leads on iOS requirement (17.0 vs 26.5). UltraVO2Max's advantage is update cadence (weekly vs every 2 months) and device support (3 vs 1). On ads and in-app purchases there is nothing between them.

HRV Sync is free to download; UltraVO2Max costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HRV Sync ships an update every 2 months, UltraVO2Max weekly. The most recent releases landed on October 28, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | HRV Sync | UltraVO2Max |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/hrv-sync/id6756378219/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free | — |
| Size | 1 MB | 12 MB |
| Requires iOS | **17.0** | 26.5 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Marcin Naglik](https://appshunter.io/developer/1860354816) | [Pai Chin Chuan](https://appshunter.io/developer/1896688550) |

## What reviewers say

### HRV Sync

[App page](https://appshunter.io/ios/app/hrv-sync/id6756378219)

Effortlessly sync your Heart Rate Variability (HRV) data to the iOS Health app. Connect your fitness account to view HRV trends alongside other health metrics. Prioritizes user privacy with secure token-based login and no data collection.

**Highlights:** One-tap HRV data sync to Health app, View HRV history and trends, Secure OAuth login, Custom date range import, Privacy-focused data handling

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

**In-app purchases:** none


### UltraVO2Max

[App page](https://appshunter.io/ios/app/ultravo2max/id6769794479)

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

**In-app purchases:** none


## Frequently asked questions

### Is HRV Sync free?

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

### Is UltraVO2Max free?

UltraVO2Max costs $2.99, with no in-app purchases.

### Do HRV Sync or UltraVO2Max have ads?

Neither HRV Sync nor UltraVO2Max shows ads.

### Which is updated more often, HRV Sync or UltraVO2Max?

HRV Sync ships an update every 2 months, and UltraVO2Max weekly. Most recently, HRV Sync was updated on October 28, 2026 and UltraVO2Max on October 15, 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.*