# Rhythm SYNC. vs Stromno

The clearest difference is price: Rhythm SYNC. at Free against Stromno's $4.99. Rhythm SYNC. also leads on ratings volume (128 vs 24). Stromno's advantage is review sentiment (57% vs 13%) and rating (3.1 vs 1.8). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

Rhythm SYNC. is free to download; Stromno costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Stromno holds the better App Store score, 3.1 against 1.8. That said, the two scores are not equally well evidenced: Rhythm SYNC. has 128 ratings behind it against 24, so its average is the more settled of the two. Written reviews point the same way: 13% of Rhythm SYNC.'s written reviews are positive against 57% of Stromno's.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 3, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Rhythm SYNC. | Stromno |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | [1.8 (128 ratings)](https://appshunter.io/ios/app/rhythm-sync/id1226606963/reviews) | **[3.1 (24 ratings)](https://appshunter.io/ios/app/stromno/id1538966480/reviews)** |
| Number of ratings | **128** | 24 |
| Positive reviews | 13.1% of reviews | **57.1% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | Free |
| Size | 47 MB | 1 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Scosche](https://appshunter.io/developer/340018842) | [Yaroslav Hryniuk](https://appshunter.io/developer/1538966482) |

## What reviewers say

### 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


### Stromno

[App page](https://appshunter.io/ios/app/stromno/id1538966480)

Broadcast your real-time heart rate from your Apple Watch to live streams on platforms like Twitch and YouTube. Easily set up a customizable widget or overlay for your stream with a simple login code.

**Highlights:** Heart rate streaming from Apple Watch, Live stream integration (Twitch, YouTube), Customizable widget/overlay designs, Easy 1-minute setup, OBS, Twitch Studio, XSplit, Streamlabs OBS compatible, Integrates with Apple Health

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Rhythm SYNC. free?

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

### Is Stromno free?

Stromno costs $4.99, with no in-app purchases.

### Which has better reviews, Rhythm SYNC. or Stromno?

Stromno is rated higher. Rhythm SYNC. averages 1.8 out of 5 from 128 ratings, while Stromno averages 3.1 from 24 ratings.

### Do Rhythm SYNC. or Stromno have ads?

Neither Rhythm SYNC. nor Stromno shows ads.

### Which is updated more often, Rhythm SYNC. or Stromno?

Rhythm SYNC. ships an update every 3 months, and Stromno every 3 months. Most recently, Rhythm SYNC. was updated on September 3, 2026 and Stromno on September 23, 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.*