HRV Sync vs UltraVO2Max
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HRV Sync
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.
- One-tap HRV data sync to Health app
- View HRV history and trends
- Secure OAuth login
- Custom date range import
- Privacy-focused data handling
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Track your Heart Rate Variability trends by syncing HRV data to the iOS Health app. HRV Sync connects to your fitness account and imports your daily HRV measurements, making them available alongside all your other health metrics in one place. FEATURES • One-tap sync of HRV data to the Health app • View your HRV history and trends • Secure OAuth login — your password is never stored • Choose custom date ranges to import HOW IT WORKS 1. Log in to your fitness tracker account 2. Select the date range to sync 3. Tap Sync — your HRV data appears in the Health app PRIVACY FIRST • Your credentials are never stored — only secure tokens • Data syncs directly to your device • No data is collected or shared with third parties COMPATIBILITY Compatible with Garmin® fitness devices and accounts. --- This app is an independent product and is not affiliated with, endorsed by, or sponsored by Garmin Ltd. or its subsidiaries. Garmin® is a registered trademark of Garmin Ltd.
UltraVO2Max
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UltraVO2Max reads your VO₂ Max directly from Apple Health and displays your aerobic fitness level and monthly running distance in real time. Key Features: • Live VO₂ Max with fitness grade • Monthly running distance • Apple Watch swimming posture tracking & data logging • Outdoor activity recommendations based on weather & air quality • Apple Watch complications (circular, rectangular, corner) • Daily motivational quote • Traditional Chinese & English supported All data is processed on-device only. Nothing is ever sent to external servers.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | HRV Sync | UltraVO2Max |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad, Apple Watch — better |
| Requires iOS | 17.0 — better | 26.5 |
| Further details — not scored | ||
| Size | 1 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Marcin Naglik | Pai Chin Chuan |
In-app purchases
HRV Sync
No in-app purchases
UltraVO2Max
No in-app purchases
