# Watta

> Watta is an AI-powered rowing workout tracker that reads any rowing machine screen. It captures workout data from erg monitor photos using OCR, scores every session with a proprietary 0-100 Effort Score, and provides heart rate zone analysis, pacing insights, and social training features.

Watta is built by Polar Industries. Available on iOS via the App Store.

## What Watta Does

- **AI OCR Capture**: Photograph your rowing machine screen after any workout. Watta extracts distance, time, split, stroke rate, and intervals automatically. Works with Concept2, WaterRower, and other ergometers.
- **Effort Score (0-100)**: A proprietary composite score combining Cardiac Load (40%), Work Output (35%), Pacing Strategy (15%), and Economy (10%). Uses Karvonen heart rate reserve method.
- **Heart Rate Zone Analysis**: Five personalised zones calculated via the Karvonen formula using resting and maximum heart rate.
- **Clubs & Squads**: Create or join rowing clubs, compete on leaderboards, and share workouts with your training group.
- **Strava Sync**: Workouts sync to Strava automatically.

## Effort Score Algorithm

The Effort Score is a 0-100 rating of workout quality:
- **Cardiac Load (40 points)**: Time spent in heart rate zones, weighted by zone intensity (Zone 1 = 1x, Zone 5 = 5x).
- **Work Output (35 points)**: Total mechanical work (watts x time) normalised against personal baseline.
- **Pacing Strategy (15 points)**: Consistency of split times across workout segments. Even or negative splits score highest.
- **Economy (10 points)**: Power output per heartbeat. Higher watts at lower heart rate = better economy.

Zones: Recovery (0-25), Building (26-50), Training (51-75), Peak (76-100).

## Supported Equipment

- Concept2 RowErg (Model D, Model E)
- Concept2 SkiErg
- Concept2 BikeErg
- Any ergometer with a PM5 monitor

## Site Structure

- [Homepage](https://getwatta.com/)
- [Glossary](https://getwatta.com/glossary) - 100 rowing and erg terminology definitions
- [Calculators](https://getwatta.com/calculators) - 10 interactive rowing calculators
- [Guides](https://getwatta.com/guides) - 18 rowing workout and training guides
- [Persona Pages](https://getwatta.com/for/rowers) - Pages for specific audiences (rowers, HYROX athletes, coaches, beginners, etc.)
- [Comparison Pages](https://getwatta.com/vs/strava) - Watta vs other fitness apps
- [City Pages](https://getwatta.com/rowing-near/london) - Rowing communities in 30 cities worldwide

## Key Formulas

- **Split to Watts**: Watts = 2.80 / pace^3, where pace = split_seconds / 500 (seconds per metre)
- **Watts to Split**: Split (seconds/500m) = 500 * (2.80 / watts)^(1/3)
- **Calorie Burn**: For >100W: calories/hr = (2.755 + (14.15 * watts)) * (time/3600). Adjusted by body weight.
- **Weight Adjustment (Concept2)**: Adjusted time = raw_time * (weight / 270)^0.222

## Contact

- Website: https://getwatta.com
- Support: support@polarindustries.co
- Company: Polar Industries

## Optional

For a detailed listing of all pages, see [llms-full.txt](https://getwatta.com/llms-full.txt).