# HRV Sync vs Ready Trainer One

The clearest difference is in-app purchases: HRV Sync at none against Ready Trainer One's 2. HRV Sync also leads on iOS requirement (17.0 vs 26.4). Ready Trainer One's advantage is update cadence (every 4 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Ready Trainer One sells 2 in-app purchases, starting at $3.99 per month. HRV Sync asks for nothing beyond the download.

HRV Sync ships an update every 2 months, Ready Trainer One every 4 days. The most recent releases landed on September 20, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | HRV Sync | Ready Trainer One |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hrv-sync/id6756378219/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Free | — |
| Size | 1 MB | 12 MB |
| Requires iOS | **17.0** | 26.4 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 12+ |
| Developer | [Marcin Naglik](https://appshunter.io/developer/1860354816) | [Nick Dawson](https://appshunter.io/developer/1858305202) |

## 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


### Ready Trainer One

[App page](https://appshunter.io/ios/app/ready-trainer-one/id6775938743)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $3.99 | per month |
| Pro Annual | $29.99 | per year |


## Frequently asked questions

### Is HRV Sync free?

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

### Is Ready Trainer One free?

Ready Trainer One is free to download, with in-app purchases available.

### Do HRV Sync or Ready Trainer One have ads?

Neither HRV Sync nor Ready Trainer One shows ads.

### Which is updated more often, HRV Sync or Ready Trainer One?

HRV Sync ships an update every 2 months, and Ready Trainer One every 4 days. Most recently, HRV Sync was updated on September 20, 2026 and Ready Trainer One on September 18, 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.*