Every
SessionErgWattSessionSecondStroke
Matters.
Snap your ERG screen, and Watta does the rest — AI extracts your data, heart rate analysis scores your effort, and your crew sees it all.
Download on the App Store
Not every 2K
is equal.
The clock doesn't tell the whole story. Every workout gets a 0-100 Effort Score combining four dimensions of how hard you actually worked — not just what the split says.
Cardiac Load makes up 40% of your score — your heart rate is the single biggest factor.
Your heart tells
the real story.
Watta uses your resting and max heart rate to build a personalized intensity picture — not generic percentages. Every workout shows your real cardiovascular effort.
No heart rate monitor? You still get a score from power and pacing — but HR unlocks the full picture.
Intensity
See your average BPM, percentage of max, and HR Reserve at a glance — the numbers that actually define how hard you went.
Personalized Zones
Five training zones calculated from your resting and max heart rate — Recovery, Aerobic, Tempo, Threshold, and Max — each mapped to your physiology.
Aerobic Efficiency
Watts per heartbeat — a single number that tracks how efficiently you convert cardiovascular effort into power on the erg. Rated from Building to Elite.
Snap and upload
your ERG screen
Watta reads and logs your erg workout so you can focus on training.
Snap your screen
Take a photo of your ERG screen display after your workout. Gallery upload works too.
AI extracts the data
Our vision AI reads every metric — time, split, distance, stroke rate, heart rate, calories.
Get your Effort Score
A proprietary 0-100 score tells you exactly how hard you worked, combining cardiac load, output, and pacing.
Built for rowers,
by rowers.
Every feature designed around the way you actually train.
AI-Powered OCR
Snap a photo of any ERG screen or PM5 display. Watta extracts time, distance, split, stroke rate, heart rate, and more — automatically. Handles interval screens, summary screens, and time workouts.
HR Zone Breakdown
See exactly how much time you spent in each heart rate zone — from recovery through max effort — on every workout.
Social Feed
Follow teammates, react to workouts, leave comments. See what your crew is putting down on the erg.
Clubs & Squads
Create or join clubs with invite codes. Organize into squads for internal competition and squad leaderboards.
Strava Sync
Connect Strava to automatically push your erg workouts. Your rowing data, everywhere you want it.
Train together.
Compete together.
Create or join rowing clubs, organize into squads, and see how you stack up on the leaderboard.
Leaderboards
Global, club, and squad leaderboards ranked by effort score, distance, or time.
Invite Codes
Share a code and your squad is in. Simple onboarding for any team size.
Push Notifications
Get notified when teammates post workouts or when your club has news.
What rowers
are saying.
From beginners to competitive athletes, here is how Watta fits into real training.
“Our whole squad logs 2K tests through Watta now. Seeing everyone's Effort Scores side by side is way more useful than just comparing splits.”
“I use the erg for HYROX prep and needed something that just tracks rowing without all the noise. Snap the screen, done.”
“I've been rowing for 15 years and finally have every session in one place. Looking back at three seasons of progress is incredibly motivating.”
“I can check in on my squad's training load without asking for screenshots. Clubs and leaderboards changed how I manage the team.”
“I didn't want to type in numbers after every workout. Photo, confirm, saved. That's it. Even I can't mess it up.”
“The Effort Score nails it. A hard steady-state at rate 18 finally gets the credit it deserves compared to a sloppy interval piece.”
“SkiErg and BikeErg support sealed the deal. I track all three machines in one app and compare effort across them.”
“I row twice a week and don't need anything complicated. Watta keeps it simple and the streaks keep me showing up.”
Dive deeper into
indoor rowing.
Guides, tools, and resources for rowers of every level.
Frequently asked
questions.
What is Watta?
Watta is a free iOS app that uses AI to read your rowing machine screen and log workouts automatically. It scores every session with a 0-100 Effort Score combining cardiac load, work output, pacing, and economy.
How does the Effort Score work?
The Effort Score combines four metrics: Cardiac Load (40% — time in heart rate zones weighted by intensity), Work Output (35% — watts × duration vs personal baseline), Pacing Strategy (15% — consistency of splits), and Economy (10% — watts per heartbeat). Scores range from Recovery (0-25) to Peak (76-100).
Which rowing machines does Watta support?
Watta works with any rowing machine that has a screen display, including Concept2 RowErg (Model D and E), Concept2 SkiErg, Concept2 BikeErg, any ergometer with a PM5 monitor, and WaterRower.
Is Watta free?
Yes, Watta is completely free to download and use. Available on the iOS App Store.
Do I need a heart rate monitor?
No. Watta calculates an Effort Score from power and pacing data alone. However, connecting a heart rate monitor unlocks the full Cardiac Load and Economy components for a more accurate score.
Does Watta sync with Strava?
Yes. Connect your Strava account in settings and Watta automatically pushes every erg workout to your Strava feed.
Every erg counts.
Download Watta and start tracking your workouts today.
Download on the App Store