Get the
Watta app.
The rowing app that turns a photo of your erg screen into a full training log — Effort Score, heart rate zones, clubs, and Strava sync included.
Everything in the free app.
One download replaces your camera roll of erg photos, your spreadsheet, and your notes app.
AI OCR capture
Photograph any erg or PM5 screen. Distance, split, stroke rate, watts, and heart rate are extracted automatically.
Effort Score 0-100
A single number that combines cardiac load, work output, pacing, and economy for every session.
Heart rate zones
Five personalised zones built from your resting and max heart rate, with time-in-zone breakdowns.
Clubs & leaderboards
Join a club, form a squad, and see how you rank by effort score, distance, or time.
Strava sync
Push every logged erg session to Strava automatically. No manual re-entry.
PBs & achievements
Personal bests across all distances, streaks, and 30 achievement badges to unlock.
What you need
- · An iPhone running iOS 15.1 or later
- · Any rowing machine, SkiErg, or BikeErg with a screen display
- · A free account (Apple, Google, or email sign-in)
- · Optional: a Bluetooth heart rate monitor for the full Effort Score
On Android?
Watta for Android is in closed beta on Google Play. Email us and we will send you an invite as soon as a slot opens.
Join the Android betaBefore you install
New to indoor rowing? Start with the beginner's guide or browse the workout library. Want the full picture first? Read what Watta does, see how it differs from Strava, or compare it in our guide to rowing apps.
Download questions.
Is Watta free to download?
Yes. Watta is completely free to download and use on the iOS App Store. There is no subscription and no paywall.
Which iPhones can run Watta?
Watta runs on any iPhone with iOS 15.1 or later installed. That covers the iPhone 6s and every model released since.
Does Watta work on iPad?
Watta is designed for iPhone. On iPad it runs in iPhone compatibility mode.
Is Watta available for Android?
An Android version is in closed beta on Google Play. Email [email protected] with the subject "Watta Android beta" to join the waitlist.
Do I need a Concept2 rowing machine?
No. Watta reads a photo of any ergometer screen — Concept2 RowErg, SkiErg, BikeErg, any PM5 monitor, WaterRower, or another brand. If it has a screen, snap a photo and Watta logs the workout.
Do I need a heart rate monitor to use Watta?
No. Watta scores every workout from power and pacing data alone. Pairing a heart rate monitor unlocks the full Cardiac Load and Economy parts of the Effort Score.
How long does setup take?
About two minutes. Download the app, create a free account with Apple, Google, or email, set your resting and max heart rate if you know them, and log your first workout with one photo.
Does Watta sync with Strava?
Yes. Connect your Strava account once in settings and every logged erg workout pushes to Strava automatically.
Every erg counts.
Download Watta and start tracking your workouts today.
Download on the App Store