Selfloops Spark vs ErgZone
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Selfloops Spark
This app helps athletes and fitness enthusiasts track, analyze, and optimize their workouts. It offers personalized training plans, goal setting, and performance insights. Connect with coaches and other users for motivation and feedback.
- Workout tracking and analysis
- Fitness challenges and goal setting
- Personalized training plans
- Heart rate monitoring
- RPE logging
- Data syncing with Apple Health
- Advanced performance analytics
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Take Your Sports Performance to the Next Level with SELFLOOPS SELFLOOPS is an advanced fitness and sports performance tracking app for Apple Watch and iPhone, designed for athletes, coaches, and fitness enthusiasts who want deeper insights into their training. Track, Analyze, and Optimize Your Workouts The iPhone app allows you to: - View and analyze your workouts from SELFLOOPS.COM - Join fitness challenges to stay motivated - Set and track weekly fitness goals - Sign up for group fitness classes - Follow personalized training plans created by your coach - Add workout notes and see feedback from your coach - Log your Rate of Perceived Exertion (RPE) to better understand your effort levels The Apple Watch app enables you to: - Use your Apple Watch as a heart rate monitor for SELFLOOPS Group Fitness classes - Track cardio workouts with real-time heart rate data - Monitor workouts on Concept2 rowers, BikeErgs, and SkiErgs - Connect to indoor rowers, treadmills, bikes, and trainers supporting Bluetooth FTMS, Cycling Power, and Speed & Cadence standards Seamless Data Syncing All your workouts automatically sync with Apple Health, Apple Activity, and the SELFLOOPS website, ensuring your training data is always up to date. Unlock Advanced Performance Insights with Athlete Premium Upgrade to Athlete Premium to access powerful sports performance analytics and connect to top third-party platforms, including Garmin, Wahoo Fitness, Polar, Withings, and Concept2. With Athlete Premium, you can also: - Export Apple Health data like sleep, steps, resting heart rate, HRV, and more to SELFLOOPS for deeper analysis - Get access to exclusive tools for elite-level performance tracking Ready to Elevate Your Training? Download SELFLOOPS today and start training smarter! Terms of Service: https://www.selfloops.com/tos.html
ErgZone
Optimize indoor training with real-time performance data, personalized pacing, and engaging challenges. Seamlessly integrates with various fitness machines, automating setup and providing critical metrics to enhance your workouts.
- Easy monitor setup
- Live performance metrics
- Smart interval pacing
- Real-time workout alerts
- Workout variety options
- Performance history tracking
- Community challenges
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ErgZone is a cutting-edge fitness platform designed to optimize your indoor training sessions. By seamlessly integrating with your Concept2, RP3, Rogue, WaterRower, Assault Fitness or FTMS-enabled machines, ErgZone provides real-time performance data, personalized pacing, and engaging challenges to push your limits. Why Choose ErgZone? Designed to streamline your training, ErgZone minimizes setup time, automates monitor configurations, and calculates critical metrics so you can focus on performance, not prep. Key Features: • Easy Monitor Setup: No need to manually set intervals – simply connect to the ergometer, and the app handles the rest. Start moving right away. • Live Metrics: View real-time data during workouts, including time, distance, pace, strokes/minute (SPM), calories, watts, heart rate (HR) zones, and more. • Smart Interval Pacing: Suggested pace per interval based on personal benchmarks (1K, 2K, 5K for rowing and skiing; 2K, 4K, 10K for cycling). • Real-Time Alerts: Instant feedback if your pace, SPM, or split time drifts from the target. • Workout Variety: Options to train by time, distance, or calories with flexibility for mixed or weighted workouts. • Daily Workouts: Access the Concept2 Workout of the Day, plus discover workouts and training plans from top coaches. • Performance History: Save your favorite workouts, track heart rate progress, and monitor key metrics. • Compete & Connect: Join challenges, follow ErgFlix workouts, and interact with our partner coaches who release weekly free workouts. • Beyond Default Metrics: Track advanced metrics like stroke count, drag factor (DF), calories, watts, SPI, HR zones, and more. • Automatic Syncing: Results are automatically uploaded to the Concept2 LogBook. Unlock ErgZone+ for Premium Tools: • Enhanced Metrics & Graphs: View each interval's post-workout heart rate and power zones in a single graph. • Expanded Metrics: Access Drive Length, Max Power, Avg. Force, Force Curve, and more. The app remembers your last-used metrics for easy setup. • Time Cap & AMRAP: For added versatility, use automatic time-capped workouts and AMRAP (as many rounds as possible). • Flexible Targets: Set workout intensity using power metrics like FTP (Functional Threshold Power), SPI, or Watts percentage. • ReRow, ReSki, ReRide: Revisit previous sessions and strive to beat your pace or time. • Communities: Create and join communities, share workouts, and engage with friends. Enable leaderboards for a fun, competitive edge. • Apple Health Integration: Sync workouts and heart rate data directly to Apple Health. • Heart Rate Monitor: Connect your favorite Bluetooth HRM to track your heart rate in real-time during workouts. • Web Dashboard: Manage workouts, schedule training, and view live stats on a computer. • MultiErg Workouts: Create custom workouts incorporating two or all three Concept2 machines in a single workout. • Dynamic Interval Intensity: Set workout pace based on a previous interval. • Apple Watch Integration: Capture heart rate data from our Apple Watch app. • Organize Your Training: Create groups, libraries, and training plans to manage better and organize your workouts. • FIT Workouts: Track non-erg workouts such as weight training, HYROX, CrossFit, etc. Requirements: • Supported Machines: Concept2 RowErg, BikeErg, SkiErg with PM5, RP3 Rower, Rogue Echo Bike or Rower, WaterRower S4 (with ComModule or CR BLE), FTMS-enabled machines. • Device: iPhone or iPad Terms of Use: https://www.erg.zone/terms
Screenshots
Verdict
The clearest difference is review sentiment: ErgZone at 81% against Selfloops Spark's 26%. ErgZone also leads on rating (4.8 vs 2.7) and ratings volume (458 vs 13). Selfloops Spark's advantage is update cadence (every 2 weeks vs every 2 months). On price, ads, in-app purchases and monetization model 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. Selfloops Spark sells 1 in-app purchase, starting at $69.99 per year and ErgZone sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
ErgZone holds the better App Store score, 4.8 against 2.7. That said, the two scores are not equally well evidenced: ErgZone has 458 ratings behind it against 13, so its average is the more settled of the two. Written reviews point the same way: 26% of Selfloops Spark's written reviews are positive against 81% of ErgZone's.
Selfloops Spark ships an update every 2 weeks, ErgZone every 2 months. The most recent releases landed on September 21, 2026 and September 18, 2026 respectively.
| Parameter | Selfloops Spark | ErgZone |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (13 ratings) | 4.8 (458 ratings) — better |
| Positive reviews | 25.9% of reviews | 80.9% of reviews — better |
| Number of ratings | 13 | 458 — better |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, Apple Watch | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 18.0 | 13.4 — better |
| Further details — not scored | ||
| Size | 46 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | SelfLoops | ERGZONE LLC |
Customer experience
Selfloops Spark
ErgZone
Bugs and requests
Selfloops Spark
Not enough reviews yet to summarise bugs or requests.
ErgZone
Reported bugs
9 issues- Heart monitor sync issues with Samsung Galaxy watch
- Workouts not appearing in logbook when connected to ErgData
- Inaccurate total time in uploads
- Rest distance not included in Strava upload
- Group membership premium features unclear
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- Workouts not shown chronologically
- Occasional hesitation to connect to PM5
- Cannot figure out how to connect to PM5
- Workout completion and upload to logbook could be more intuitive
Requested features
7 requests- Sync with Samsung Galaxy watch
- Add a beep function for interval changes
- Confirmation pop-up for unsaved workout changes
- Require unique names for workouts
- Apple Health integration
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- Native Apple Health synchronization
- Sharing with Apple Health
In-app purchases
Selfloops Spark
- Athlete Premium$69.991 Year
ErgZone
- EZ+ Monthly7 Days trial$4.991 Month
- EZ+ Annual$49.991 Year









