ErgData vs Watta
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ErgData
This training partner app allows you to set up and customize workouts, view real-time stats, and track your progress. It syncs with a popular online logbook and offers detailed post-workout analysis. Compatible with various devices, it enhances your fitness journey with data-driven insights.
- Customizable workout setup
- Real-time workout stats
- Progress tracking
- Syncs with Concept2 Logbook
- Post-workout analysis
- Workout of the Day feature
- Voice guidance
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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.
Watta
Effortlessly log your rowing, biking, and skiing workouts by simply taking a photo of your machine's screen. AI automatically extracts your performance data, organizing it into a comprehensive training log. Connect with your club, compete on leaderboards, and share your progress with teammates.
- AI photo data extraction
- Automatic workout logging
- Support for Concept2 monitors
- Manual workout entry
- Training history and trends
- Club and squad features
- Leaderboards and competition
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Free. Photograph your Concept2 PM5, PM4 or PM3 after a piece and Watta logs the whole workout: no typing, no cables. Every session is scored 0–100 and kept in your training log, and can go straight to Strava. SNAP YOUR ERG. WATTA LOGS IT. Take a photo of the PM5 summary screen, or pick one from your camera roll. Watta reads distance, time, average split, stroke rate and every interval, plus watts, heart rate, calories and drag factor when the monitor shows them. You check the numbers before anything is saved. Photograph several screens (summary, splits, heart rate) and Watta reads them as one workout. EVERY SESSION SCORED 0–100 The Effort Score rates how hard you really worked, from four parts: • Cardiac Load: your average heart rate against your heart-rate reserve • Work Output: watts and duration, scaled for your body weight • Pacing: how even your splits were • Economy: watts per stroke Zones: Recovery, Building, Training and Peak. HEART RATE ZONES Pair a strap to the PM5 so heart rate shows on the screen, and Watta labels each piece by zone using your resting and max heart rate. YOUR WHOLE TRAINING LOG Every workout in one place, with personal bests for every standard distance on each machine, progress charts, streaks and achievement badges. Import the sessions you upload to the Concept2 Logbook. STRAVA Connect Strava and turn on auto-sync, and every workout you log in Watta is posted there too. NEW: SEND WORKOUTS TO YOUR PM5 Got a PM5? Build a workout in Watta (a 2k test, an interval set, a steady piece), save it to your workout library, and tap Start on my PM5. Watta sets it up on the monitor over Bluetooth, ready to row. Then snap the screen when you're done. COACHING Coaches keep a library of sessions, build training plans of up to 12 weeks, and send them to individual athletes or a whole boat. Athletes accept a session, row it, snap the result and mark it done, and the coach sees how it went against the plan. Invite rowers by email or with a crew code, even before they have Watta. CLUBS AND SQUADS Join your club with an invite code, train with your squad, see their workouts in your feed, and compare on club and squad leaderboards. BUILT FOR CONCEPT2 Works with the RowErg, SkiErg and BikeErg, on PM5, PM4 and PM3 monitors. Sending workouts over Bluetooth needs a PM5. Photos of other brands of rower aren't read automatically, so enter those sessions by hand. Free to download. Every erg matters. Watta is a training log, not a medical device. Talk to your doctor before starting a new exercise programme.
Screenshots
Verdict
The clearest difference is ratings volume: ErgData at 6.5K against Watta's 2. Watta's advantage is rating (5.0 vs 4.8). On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Watta holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: ErgData has 6.5K ratings behind it against 2, so its average is the more settled of the two.
ErgData ships an update fortnightly, Watta every 2 weeks. The most recent releases landed on November 14, 2026 and November 9, 2026 respectively.
| Parameter | ErgData | Watta |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (6.5K ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 47.2% of reviews | — |
| Number of ratings | 6.5K — better | 2 |
| Update frequency | Fortnightly | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPod |
| Requires iOS | 16.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 76 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | Concept2, Inc. | STEPHEN CHRISTOPHER MILTON |
Customer experience
ErgData
Watta
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 moreShow fewer
- 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 moreShow fewer
- Add recovery heart rate tracking
- Display METS data
- Allow custom heart rate zones in logbook
Watta
Not enough reviews yet to summarise bugs or requests.
In-app purchases
ErgData
No in-app purchases
Watta
No in-app purchases







