Comparison

ErgData vs NK Logbook

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ErgData

This app acts as a personal training partner for Concept2 equipment. It allows users to set up custom workouts, view real-time stats, track progress, and sync data with online platforms. It also offers workout of the day challenges and detailed post-workout analysis.

Highlights
  • Custom workout setup
  • Real-time workout stats
  • Progress tracking
  • Sync with Concept2 Logbook
  • Workout of the Day
  • Post-workout analysis
  • Apple Watch compatibility
Features
Read full description

ErgData from Concept2 is your personal training partner. Set up workouts from your phone or tablet, view customized stats and information during workouts, track your progress, sync with the Concept2 Online Logbook, take part in the Workout of the Day and much more. Features -Set up workouts from your phone, making it simple to create even the most complex of interval workouts. You can choose to store workouts as favorites or rerow past efforts straight from ErgData. -Set the Concept2 Workout of the Day on the monitor with a single tap. -Compatible with the Apple Watch. Watch users can now see real-time heart rate data on the screen during the workout and in analysis afterwards. -Choose from different workout display options, including small, medium and large data screens, a pace graph screen, an interval and split table or a pace boat. Easily swipe between screens during your workout. Customize the data shown to suit you. -Syncs with the Concept2 Online Logbook, making it easy for you to take part in our many challenges. From the Online Logbook, your workouts can get sent to platforms such as Strava, Garmin Connect or Training Peaks. -Detailed post-workout analysis helps you know exactly what happened during your workout. See all your interval and split data, as well as pace and rate graphs, plus how long you spent in each heart rate zone. -Optional voice guidance to send audible workout data and results. Technical Specifications -Compatible with the PM5. -Compatible with the Concept2 RowErg, SkiErg and BikeErg -Connects to Apple Health -Connects to PM5 via Bluetooth only Note: Please do not have a USB stick in the PM5 at the same time as using ErgData, as this may prevent workouts being saved.

About

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.

Highlights
  • 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
Features
Read 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)

Screenshots

ErgData4 screens
NK Logbook4 screens

Verdict

The call

The clearest difference is rating: ErgData at 4.7 against NK Logbook's 3.8. ErgData also leads on in-app purchases (none vs 4) and update cadence (fortnightly vs every 4 months). NK Logbook's advantage is review sentiment (63% vs 46%) and iOS requirement (13.0 vs 16.0). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. NK Logbook sells 4 in-app purchases, starting at $9.99 per month. ErgData asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ErgData holds the better App Store score, 4.7 against 3.8. That said, the two scores are not equally well evidenced: ErgData has 5.9K ratings behind it against 12, so its average is the more settled of the two. Written reviews complicate that: 46% of ErgData's written reviews are positive against 63% of NK Logbook's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

ErgData ships an update fortnightly, NK Logbook every 4 months. The most recent releases landed on October 20, 2026 and October 9, 2026 respectively.

Scorecard7 real differences · 3 level
ErgData versus NK Logbook: the parameters behind the verdict, then further details
ParameterErgDataNK Logbook
PriceFreeFree
Rating4.7 (5.9K ratings) — better3.8 (12 ratings)
Positive reviews45.6% of reviews62.5% of reviews — better
Number of ratings5.9K — better12
Update frequencyFortnightly — betterEvery 4 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS16.013.0 — better
Further details — not scored
Size76 MB57 MB
Age rating4+4+
DeveloperConcept2, Inc.Nielsen-Kellerman Co.

Customer experience

ErgData

All ratings5,892 ratings
Positive93.8%
Neutral1.5%
Negative4.7%
Written reviews680 reviews
Positive45.6%
Neutral11.2%
Negative43.2%

NK Logbook

All ratings12 ratings
Positive66.7%
Neutral8.3%
Negative25.0%
Written reviews8 reviews
Positive62.5%
Neutral0.0%
Negative37.5%

Bugs and requests

ErgData

Reported bugs

6 issues
  • Workout data not saving
  • Heart rate data freezing
  • Disconnects during workouts
  • Sync issues with Apple Health and Strava
  • Login issues and frequent logouts
Show 1 more
  • Incompatibility with older firmware versions

Requested features

8 requests
  • Add friend mode
  • Integrate Apple Watch support
  • Add manual workout entry
  • Implement landscape mode for iPad
  • Integrate pace calculator
Show 3 more
  • Add recovery heart rate tracking
  • Display METS data
  • Allow custom heart rate zones in logbook

NK Logbook

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

ErgData

No in-app purchases

4 purchases

NK Logbook

Subscriptions4
  • 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 more
  • Team Yearly Subscription14 Days trial$749.991 Year

Questions

Is ErgData free?
ErgData is free to download, with no in-app purchases.
Is NK Logbook free?
NK Logbook is free to download, with in-app purchases available.
Which has better reviews, ErgData or NK Logbook?
ErgData is rated higher. ErgData averages 4.7 out of 5 from 5.9K ratings, while NK Logbook averages 3.8 from 12 ratings.
Do ErgData or NK Logbook have ads?
Neither ErgData nor NK Logbook shows ads.
Which is updated more often, ErgData or NK Logbook?
ErgData ships an update fortnightly, and NK Logbook every 4 months. Most recently, ErgData was updated on October 20, 2026 and NK Logbook on October 9, 2026.

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