NK Logbook vs ErgZone
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NK Logbook
This app pairs with compatible GPS devices to import, review, and analyze session data. It also streams live performance measurements for coaches and spectators, offering real-time insights into rowing performance and location.
- Import session data from compatible devices
- Review and analyze boat metrics and stroke profile
- Stream live performance measurements
- Real-time location tracking for safety and spectator viewing
- Team management for coaches and athletes
- Compare live data from multiple boats
Read full descriptionHide full description
NK LiNK Logbook pairs with your CoxBox GPS & SpeedCoach GPS/SUP/OC with Training Pack to (1) import session data for review and analysis and (2) stream live performance measurements to NK's public online viewer at logbook.nksports.com. QUICK AND EASY TO STORE SESSION DATA Pair with your NK device using Data LiNK mode to import session memory to your secure account. REVIEW AND ANALYZE SESSION PERFORMANCE Quickly find and select sessions from the calendar view. Review your course overlayed on a map. Check boat metrics for any or all of the session. Get a clear understanding of your rowing style by viewing your stroke profile. QUICK AND EASY TO STREAM LIVE DATA Pair with your NK device using Live Stream mode. Keep the paired phone and NK device together on the water while training or racing. SAFETY ON THE WATER Coaches, family, friends and spectators can view your location on the map viewer. Just scan the map viewer or boat list to locate any streaming boat. TEAM SUBSCRIPTIONS Assign Coaches and Athletes to your team for easy data sharing Privately stream live performance data to your assigned team coaches Simultaneously compare live streaming data from multiple boats ESSENTIAL COACHING TOOL Coaches can view real-time location and performance measurements during workouts in order to provide more effective feedback. All performance measurements in the NK device are available in the live viewer, so coaches can select which measurements to monitor during each session. IMPROVED SPECTATOR EXPERIENCE Spectators and coaches can view real-time position and performance measurements during an event (please check with the regatta officials regarding the legality of cell phone use during a race). With all entries streaming their data, spectators can see who's ahead by how much - all in real-time! REQUIREMENTS - Compatible with CoxBox GPS, with firmware version 1.00 or higher. - Compatible with SpeedCoach GPS 2, SpeedCoach SUP 2 and SpeedCoach OC 2. Training Pack is required, with firmware version 2.19 or higher. - Mobile device must have Bluetooth 4.3 or higher, and must have Bluetooth peripheral service. - Mobile device must have cellular service. - Mobile device must have iOS 10.0 or higher (iPad 4 and higher/ iPhone 5 or 5c and higher)
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
Read full descriptionHide full description
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 rating: ErgZone at 4.8 against NK Logbook's 3.8. ErgZone also leads on ratings volume (458 vs 12) and review sentiment (82% vs 63%). 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. NK Logbook sells 4 in-app purchases, starting at $9.99 per month 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 3.8. That said, the two scores are not equally well evidenced: ErgZone has 458 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 63% of NK Logbook's written reviews are positive against 82% of ErgZone's.
NK Logbook ships an update every 4 months, ErgZone every 2 months. The most recent releases landed on October 9, 2026 and October 15, 2026 respectively.
| Parameter | NK Logbook | ErgZone |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (12 ratings) | 4.8 (458 ratings) — better |
| Positive reviews | 62.5% of reviews | 81.6% of reviews — better |
| Number of ratings | 12 | 458 — better |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 13.0 — better | 13.4 |
| Further details — not scored | ||
| Size | 57 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Nielsen-Kellerman Co. | ERGZONE LLC |
Customer experience
NK Logbook
ErgZone
Bugs and requests
NK Logbook
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
Show 4 moreShow fewer
- 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
Show 2 moreShow fewer
- Native Apple Health synchronization
- Sharing with Apple Health
In-app purchases
NK Logbook
- Monthly Coach Subscription14 Days trial$9.991 Month
- Monthly Team Subscription14 Days trial$74.991 Month
- Annual Coach Subscription14 Days trial$99.991 Year
Show 1 moreShow fewer
- Team Yearly Subscription14 Days trial$749.991 Year
ErgZone
- EZ+ Monthly7 Days trial$4.991 Month
- EZ+ Annual$49.991 Year
Questions
Is NK Logbook free?
Is ErgZone free?
Which has better reviews, NK Logbook or ErgZone?
Do NK Logbook or ErgZone have ads?
Which is updated more often, NK Logbook or ErgZone?
Other comparisons















