Rhythm SYNC. vs SUMMIIT Challenges
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rhythm SYNC.
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.
- 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
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The award-winning Rhythm Heart Rate Monitors use patented technology to capture exceptionally accurate performance in both wet and dry conditions. This Scosche Rhythm Sync app: · Connects to Rhythm 24 and Rhythm+ Heart Rate Monitors · Manages Rhythm 24 activity modes and biometrics functionality: Heart Rate Only, Running, Cycling, Swimming, Heart Rate Variability, Duathlon, and Triathlon · Displays heart rate data from your Rhythm Monitors · Displays Rhythm battery level · Configures sharing with compatible heart rate tracking apps, fitness watches, bike computers, and fitness equipment, to stream your fitness-data in real time, track heart rate history, and more! · Collects Rhythm 24 recorded activities and has download capabilities · Allows for Rhythm Heart Rate Monitors software and firmware updates · HealthKit integration which allows you save workout data recorded on the sensor.
SUMMIIT Challenges
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.
- On-demand fitness events
- Event registration and team assignment
- Event-day logging
- Pre-built training plans
- Historical performance metrics
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SUMMIIT Challenges provides on-demand access to fitness events, challenges and training plans. EVENTS PeloFondo, SUMMIIT:CLIMB and SUMMIIT:STRIDE participation has never been easier. Registration, team assignment, and event-day logging are all available. TRAINING Pre-build on-demand training plans are available to help you prepare for the next event or challenge. HISTORICAL METRICS: See your improvement from event to event and challenge to challenge. View EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Rhythm SYNC. | SUMMIIT Challenges |
|---|---|---|
| Price | Free | Free |
| Rating | 1.8 (128 ratings) | 4.9 (137 ratings) — better |
| Positive reviews | 13.1% of reviews | 98.9% of reviews — better |
| Number of ratings | 128 | 137 — better |
| Update frequency | Every 3 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 47 MB | 95 MB |
| Age rating | 4+ | 4+ |
| Developer | Scosche | SUMMIIT Challenges, LLC. |
Customer experience
Rhythm SYNC.
SUMMIIT Challenges
User reviews
Rhythm SYNC.
From 128 App Store ratingsWhat we love
- ✅ 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)
Room to improve
- 🐛 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
SUMMIIT Challenges
From 137 App Store ratingsWhat we love
- 🚀 Easy to use
- 👍 Seamless integration with Peloton
- 🚴♂️ Motivating challenges
- 🎉 Supportive community
- 📊 Helpful tracking and metrics
Room to improve
- 🐛 Occasional app crashes
- 🔍 Desire for more customization options
Bugs and requests
Rhythm SYNC.
Reported bugs
17 issues- 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
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- Custom heart rate zones not applied to recordings
- Battery level shows as zero or incorrect
- Settings menu items non-functional or unresponsive
- App loses connection when device syncs with other apps
- Data disappears when monitor disconnects
- Export to CSV ignores custom zones
- App crashes when attempting to share workout data
- Last mode setting not remembered between sessions
- Unable to modify personal details (height, weight, birthday)
- Incompatibility with iPhone X and newer models
- Firmware update window won't open
- App incompatible with iOS 11 and newer versions
Requested features
12 requests- 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
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- Auto-sync feature when device is detected
- Detailed analytics and charts
- Better user profile settings (height, weight, age)
- Dark mode option
- Improved troubleshooting and help documentation
- Ability to delete saved connections to health apps
- Support for multiple languages in documentation
SUMMIIT Challenges
Reported bugs
2 issues- App crashes on load
- Syncing issues with Peloton
Requested features
2 requests- Comparison of past event performance
- Ability to manually input ride data
In-app purchases
Rhythm SYNC.
No in-app purchases
SUMMIIT Challenges
- Unlock Multisync Capability$4.99
- Unlock Real-Time Event Data$9.99
- PeloFondo Prep (35-50 Miles)$34.99
Show 2 moreShow fewer
- PeloFondo Prep 85-100+ Miles$34.99
- PeloFondo Prep 50-85 Mile Goal$34.99
Questions
Is Rhythm SYNC. free?
Is SUMMIIT Challenges free?
Which has better reviews, Rhythm SYNC. or SUMMIIT Challenges?
Do Rhythm SYNC. or SUMMIIT Challenges have ads?
Which is updated more often, Rhythm SYNC. or SUMMIIT Challenges?
Other comparisons
