Free Data and Analysis. For Rowers. By Rowers.







Welcome to is an online tool for indoor and On The Water (OTW) rowers. It accepts workout data from a number of devices and applications. It analyzes the data to provide valuable insights about your training, and enables you to share data with many common online training tracking systems.

Quick Start

On our Videos Page, we already have a few nice videos to get you started with your rowing data. Jump right in and see how we do things at!

Indoor Rowing is designed to work with all models of the Concept2 Indoor rower. Using applications like ergstick, rowpro, ergdata or painsled; a user can collect stroke by stroke data from the Concept2 Performance Monitor (Models PM3, PM4 or PM5). Workout data can be exported from these applications, usually in CSV format, and uploaded to Users can upload workouts either through the online interface, for by emailing workouts to the site to simplify the process for some applications.

On The Water Rowing

On the water rowers use either dedicated devices like Speedcoaches or smartphone applications to collect data on their workouts. All of these devices and applications provide a method to export workout data in CSV, TCX or FIT format files. Workout data in these formats can be uploaded to Users can upload workouts either through the online interface, for by emailing workouts to the site to simplify the process for some applications.

Basic Analysis

Many athletes use training approaches that use heart rate as a key metric. In general, HR training is managed by defining different training zones for different purposes. uses heart rate zone definitions that are consistent with the Concept2 Training Guide.

After a user defines their training zones, any training files that are uploaded with HR data can be analyzed to provide time in HR zone pie charts.

The tools also provide the ability to review a row, stroke by stroke in plots versus time or distance. Basic plots in include HR, Pace, Stroke rate, and power for the erg.

The tools also provide a text summary of the row.

Workout Export provides the ability to easily export workouts from the erg or boat to the Concept2 online logbook. Export to other sport tracking sites like Strava and SportTracks is also supported. Users can also export workout data by email.

Import Compatibility tries to be compatible with the most important tools that rowers use to capture the data (both indoor and OTW). For a full list of currently supported devides/apps, click here.


The project is based on python plotting code by Greg Smith ( and inspired by the RowPro Dan Burpee spreadsheet (

Advanced Analysis (Premium Features)

Beyond the basics, provides a rich tool set for OTW rowing. You can use it to estimate stroke power and to correct for the effects of wind and current. For indoor rowing, when used with painsled, and OTW rowing, when used with a NK Empower Oarlock, the tools enable graphical analsis of stroke metrics including:

  • Peak and average force
  • drive length
  • work per stroke
  • drive and recovery time
  • catch and finish angles (OTW)
  • slip and wash (OTW)
These can be analyzed versus time, distance, stroke rate or other parameters to get a better understand of the strengths and weaknesses of a rowers technique.

The online logbook provide the ability to record OTW sessions manually, but none of the data from these sessions is captured.

The Premium Features are available for only 15 EURO per year. Your 15 EURO will be used to cover the hosting costs of the site.

Click on the PayPal button to pay for your Premium membership. Before you pay, please register for the free Basic membership and log in. In this way, your user name will be added to the payment details. Your payment will be valid for one year with automatic renewal which you can stop at any time. You will be taken to the secure PayPal payment site.

After you do the payment, we will manually change your membership to "Pro". Depending on our availability, this may take some time (typically one working day). Don't hesitate to contact us if you have any questions at this stage.

Recurring Payment

You need a Paypal account for this

One Year Subscription

Only a credit card needed. Will not automatically renew

What's new?

  • 2016-12-19 Interactive stroke curve for NK Empower Oarlock
  • 2016-12-07 Favorite Flex Charts for Premium users
  • 2016-12-01 Support for NK Empower Oarlock parameters (catch and finish angles, slip and wash, and power as measured by the Oarlock
  • 2016-11-10 Power based Pie Charts
  • 2016-11-01 Sliders to select subsets of data on some plots
  • 2016-11-01 Emailing workouts to
  • 2016-11-01 Interval Editor
  • 2016-09-30 Stroke Analysis Plot - with date range filtering
  • 2016-09-29 Improved Flex plot, Power Histogram and Ranking Pieces - with date range filtering
  • 2016-09-20 Added the Power histogram
  • 2016-08-31 Added the Ranking Piece summary and pace predictor
  • 2016-08-02 Added support for the SpeedCoach GPS 2 CSV/FIT file export
  • 2016-07-19 Added the possibility to download wind data from The Dark Sky /
  • 2016-07-19 New Flexible interactive charts for OTE and OTW (pick your own axes parameters)
  • 2016-07-07 Wind and Stream corrections for OTW (Premium functionality)
  • 2016-06-23 Premium users can now compare workouts
  • 2016-06-20 Fixed Strava upload and added SportTracks import and export. The export is not working reliably. We are debugging this,
  • 2016-06-08 Added possibility to upload CrewNerd summary CSV file for Premium Members
  • 2016-06-08 Added workout summaries
  • 2016-06-05 Export to Strava is working
  • 2016-06-01 We're approved on the Concept2 logbook!!!!

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