# iCardio Workout Tracker vs Rhythm SYNC.

The clearest difference is review sentiment: iCardio Workout Tracker at 63% against Rhythm SYNC.'s 13%. iCardio Workout Tracker also leads on rating (4.8 vs 1.8) and update cadence (every 11 days vs every 3 months). Rhythm SYNC.'s advantage is in-app purchases (none vs 4) and iOS requirement (12.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. iCardio Workout Tracker sells 4 in-app purchases, starting at $4.99 per month. Rhythm SYNC. asks for nothing beyond the download.

iCardio Workout Tracker holds the better App Store score, 4.8 against 1.8. That said, the two scores are not equally well evidenced: iCardio Workout Tracker has 3.4K ratings behind it against 128, so its average is the more settled of the two. Written reviews point the same way: 63% of iCardio Workout Tracker's written reviews are positive against 13% of Rhythm SYNC.'s.

iCardio Workout Tracker ships an update every 11 days, Rhythm SYNC. every 3 months. The most recent releases landed on September 23, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | iCardio Workout Tracker | Rhythm SYNC. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (3.4K ratings)](https://appshunter.io/ios/app/icardio-workout-tracker/id314841648/reviews)** | [1.8 (128 ratings)](https://appshunter.io/ios/app/rhythm-sync/id1226606963/reviews) |
| Number of ratings | **3.4K** | 128 |
| Positive reviews | **63.4% of reviews** | 13.1% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 3 months |
| Monetization | Freemium | **Free** |
| Size | 85 MB | 47 MB |
| Requires iOS | 17.6 | **12.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fitdigits Inc](https://appshunter.io/developer/1126857444) | [Scosche](https://appshunter.io/developer/340018842) |

## What reviewers say

### iCardio Workout Tracker

[App page](https://appshunter.io/ios/app/icardio-workout-tracker/id314841648)

This app helps you train smarter by using your heart rate data. It tracks workouts, provides real-time feedback, and integrates with wearables and Apple Health to offer insights into your performance and progress.

**Highlights:** Heart rate zone tracking, GPS route mapping, Voice coaching, Apple Watch & Health integration, Real-time workout sharing, Custom fitness assessments

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Star Monthly | $4.99 | per month |
| Pro Plus | $24.99 | per year |
| Star | $29.99 | per year |
| Plus | $6.99 | one-time |

**What reviewers like**

- 👍 Great app
- 🚀 Accurate tracking
- 💡 Customizable screens
- 🚀 Reliable connection
- 👍 Motivating

**What reviewers complain about**

- 🐛 Crashes and sync issues
- 🔋 Battery drain
- 🔒 Subscription model
- 🐛 Inconsistent performance
- 🐛 Sensor connection problems

**Reported bugs**

- Garmin ANT+ connectivity issues
- Incorrect calorie/distance tracking
- Unreliable heart rate monitoring

**Requested features**

- Lap/split time tracking
- Multi-user profiles
- Treadmill/elliptical integration
- More customization options
- Improved Apple Watch integration


### Rhythm SYNC.

[App page](https://appshunter.io/ios/app/rhythm-sync/id1226606963)

This app connects to heart rate monitors to display real-time data, manage activity modes, and track workout history. It allows for software updates and integrates with HealthKit for saving workout data.

**Highlights:** Connects to Rhythm 24 and Rhythm+ monitors, Manages activity modes and biometrics, Displays heart rate and battery level, Configures data sharing with other apps, Collects and downloads recorded activities, Performs software and firmware updates, HealthKit integration

**In-app purchases:** none

**What reviewers like**

- ✅ Accurate heart rate readings
- 🔋 Long-lasting device battery life
- 🔄 Reliable device hardware
- 📱 Simple and straightforward interface
- 🔗 Works well with third-party apps (Peloton, Garmin, Apple Watch)

**What reviewers complain about**

- 🐛 Frequent Bluetooth connection failures
- 🐛 App crashes and freezes regularly
- ❌ App doesn't recognize connected devices
- ⚠️ HRV mode difficult or impossible to access
- 📊 Extremely limited app functionality

**Reported bugs**

- App fails to detect device despite Bluetooth connection
- Bluetooth connection drops frequently during workouts
- App crashes on startup (splash screen freeze)
- Firmware update fails repeatedly
- HRV readings not displaying or accessible

**Requested features**

- HRV (Heart Rate Variability) mode that actually works
- Comprehensive workout history and logging
- Data export to multiple health apps (MyFitnessPal, TrainingPeaks, etc.)
- Customizable heart rate zones that persist
- Batch download and export of multiple files


## Frequently asked questions

### Is iCardio Workout Tracker free?

iCardio Workout Tracker is free to download, with in-app purchases available.

### Is Rhythm SYNC. free?

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

### Which has better reviews, iCardio Workout Tracker or Rhythm SYNC.?

iCardio Workout Tracker is rated higher. iCardio Workout Tracker averages 4.8 out of 5 from 3.4K ratings, while Rhythm SYNC. averages 1.8 from 128 ratings.

### Do iCardio Workout Tracker or Rhythm SYNC. have ads?

Neither iCardio Workout Tracker nor Rhythm SYNC. shows ads.

### Which is updated more often, iCardio Workout Tracker or Rhythm SYNC.?

iCardio Workout Tracker ships an update every 11 days, and Rhythm SYNC. every 3 months. Most recently, iCardio Workout Tracker was updated on September 23, 2026 and Rhythm SYNC. on September 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*