Rhythm SYNC. vs byrna
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.
byrna
This AI-powered fitness app creates personalized strength training programs that adapt to your progress. Track your workouts, monitor your strength gains with a unique scoring system, and gain insights into your muscle recovery and nutrition.
- AI-powered adaptive workout programs
- Comprehensive workout logging
- Byrna Score for strength tracking
- Muscle recovery heatmap
- Food and supplement logging
- Progress analytics
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Byrna turns training into a system. Get an AI strength coach that builds and adapts your program, track every set, and watch your Byrna Score climb from 300 to 850 as you get stronger. And it's more than fitness — a Bible verse of the day and a devotional meet you every morning, so you train your spirit alongside your body. Most fitness apps just log what you did. Byrna tells you what to do next — and shows you the progress to prove it's working. WHAT YOU GET FREE Full workout logging — every set, rep, and weight Daily Devotional — a Bible verse of the day with an AI-built study, your own saved notes, and full history Your Byrna Score (300–850) tracking your training Build and edit your own program — including an optional weekly cardio day Daily check-in — log last night's sleep and today's bodyweight Supplement tracking BYRNA PREMIUM AI Coach — a strength coach that adapts your program to every session Progress Analytics — strength, volume, and score trends over time Muscle Heatmap — see exactly which muscles you've worked and what's recovering Food Logging — log meals and hit your macro targets Byrna Premium: $9.99/month or $79.99/year. A 1-week free trial is available for new subscribers. Payment is charged to your Apple ID at confirmation. Subscription auto-renews unless canceled at least 24 hours before the period ends; manage or cancel anytime in your App Store account settings. Terms of Use: https://usebyrna.com/terms Privacy Policy: https://usebyrna.com/privacy
Screenshots
Verdict
The clearest difference is review sentiment: byrna at 100% against Rhythm SYNC.'s 13%. byrna also leads on rating (5.0 vs 1.8) and update cadence (every 9 days vs every 3 months). Rhythm SYNC.'s advantage is in-app purchases (none vs 2) and ratings volume (128 vs 2). On price, ads 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. byrna sells 2 in-app purchases, starting at $9.99 per month. Rhythm SYNC. asks for nothing beyond the download.
byrna holds the better App Store score, 5.0 against 1.8. That said, the two scores are not equally well evidenced: Rhythm SYNC. has 128 ratings behind it against 2, 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 100% of byrna's.
Rhythm SYNC. ships an update every 3 months, byrna every 9 days. The most recent releases landed on October 2, 2026 and October 3, 2026 respectively.
| Parameter | Rhythm SYNC. | byrna |
|---|---|---|
| Price | Free | Free |
| Rating | 1.8 (128 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 13.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 128 — better | 2 |
| Update frequency | Every 3 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 47 MB | 15 MB |
| Age rating | 4+ | 17+ |
| Developer | Scosche | AIDEN AUGUST LINDAN BUCK |
Customer experience
Rhythm SYNC.
byrna
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
Show 12 moreShow fewer
- 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
Show 7 moreShow fewer
- 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
byrna
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Rhythm SYNC.
No in-app purchases
byrna
- Premium Monthly Subscription7 Days trial$9.991 Month
- Premium Yearly Subscription7 Days trial$79.991 Year
