# Rhythm SYNC. vs SUMMIIT Challenges

The clearest difference is review sentiment: SUMMIIT Challenges at 99% against Rhythm SYNC.'s 13%. SUMMIIT Challenges also leads on rating (4.9 vs 1.8) and update cadence (every 2 weeks vs every 3 months). Rhythm SYNC.'s advantage is in-app purchases (none vs 5) and ads (none vs shown). On price, ratings volume and device support there is nothing between them.

Both are free to download. SUMMIIT Challenges sells 5 one-off in-app purchases. Rhythm SYNC. asks for nothing beyond the download.

SUMMIIT Challenges holds the better App Store score, 4.9 against 1.8. Both are backed by a comparable volume of ratings — 128 and 137 respectively. Written reviews point the same way: 13% of Rhythm SYNC.'s written reviews are positive against 99% of SUMMIIT Challenges's.

Rhythm SYNC. ships an update every 3 months, SUMMIIT Challenges every 2 weeks. The most recent releases landed on October 2, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Rhythm SYNC. | SUMMIIT Challenges |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.8 (128 ratings)](https://appshunter.io/ios/app/rhythm-sync/id1226606963/reviews) | **[4.9 (137 ratings)](https://appshunter.io/ios/app/summiit-challenges/id1572530107/reviews)** |
| Number of ratings | 128 | **137** |
| Positive reviews | 13.1% of reviews | **98.9% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 47 MB | 95 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Scosche](https://appshunter.io/developer/340018842) | [SUMMIIT Challenges, LLC.](https://appshunter.io/developer/1569520305) |

## 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


### SUMMIIT Challenges

[App page](https://appshunter.io/ios/app/summiit-challenges/id1572530107)

Access fitness events, challenges, and training plans on demand. Register for events, track your progress, and view historical metrics to monitor your improvement over time.

**Highlights:** On-demand fitness events, Event registration and team assignment, Event-day logging, Pre-built training plans, Historical performance metrics

**Features:** Apple Wallet

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Multisync Capability | $4.99 | one-time |
| Unlock Real-Time Event Data | $9.99 | one-time |
| PeloFondo Prep (35-50 Miles) | $34.99 | one-time |
| PeloFondo Prep 85-100+ Miles | $34.99 | one-time |
| PeloFondo Prep 50-85 Mile Goal | $34.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 👍 Seamless integration with Peloton
- 🚴‍♂️ Motivating challenges
- 🎉 Supportive community
- 📊 Helpful tracking and metrics

**What reviewers complain about**

- 🐛 Occasional app crashes
- 🔍 Desire for more customization options

**Reported bugs**

- App crashes on load
- Syncing issues with Peloton

**Requested features**

- Comparison of past event performance
- Ability to manually input ride data


## Frequently asked questions

### Is Rhythm SYNC. free?

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

### Is SUMMIIT Challenges free?

SUMMIIT Challenges is free to download, with in-app purchases available.

### Which has better reviews, Rhythm SYNC. or SUMMIIT Challenges?

SUMMIIT Challenges is rated higher. Rhythm SYNC. averages 1.8 out of 5 from 128 ratings, while SUMMIIT Challenges averages 4.9 from 137 ratings.

### Do Rhythm SYNC. or SUMMIIT Challenges have ads?

SUMMIIT Challenges shows ads; Rhythm SYNC. does not.

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

Rhythm SYNC. ships an update every 3 months, and SUMMIIT Challenges every 2 weeks. Most recently, Rhythm SYNC. was updated on October 2, 2026 and SUMMIIT Challenges on September 27, 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.*