Support

The Wobble Factor is a real-time stability score calculated from your iPhone's motion sensors. It's a single number that reflects how much the craft is moving in unwanted ways during a row. Lower means more stable. The goal is to give your team something concrete to observe and work toward improving.

Any iPhone with Core Motion support, which covers every iPhone from the 5s onward. The app requires iOS 16 or later. No additional accessories are required beyond a way to attach the phone to the craft.

No. Wobble automatically detects how the phone is oriented when attached to the craft and compensates accordingly. Mount it however is convenient and secure. No manual configuration needed.

Yes. The Wobble Factor is computed from the motion of the craft regardless of boat type. It's relevant to any shell: single, double, quad, eight, sweep, or scull.

Yes. No personally identifiable information is collected. Sensor, GPS, and motion data is transmitted to a research database in iCloud and used solely to improve the models behind the Wobble Factor, stroke rate, and speed. Only the research team has access to that data. If you wish to have your data removed from the research project, get in touch through this page and it will be removed. See the Privacy Policy for full details.

The Rower ID is an anonymous identifier that's generated on your device the first time you open Wobble. It allows the database to group sessions from the same device together in the research database. It's useful for analysing how stability changes across rows. The ID is not tied to your name, email, Apple ID, or any other personal information. It accompanies session data sent to the research database. If you'd like your data removed from the research project, send your Rower ID through the form below and every session associated with it will be deleted.

First, confirm that Motion & Fitness permission is enabled for Wobble in Settings → Privacy & Security → Motion & Fitness. Make sure the phone is securely attached to the craft and not moving freely in a bag or pocket. If issues persist, close and reopen the app and start a new session.