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Your training data belongs to whichever account you sign in with.
Signing in with Concept2 also connects your logbook, so imports work straight away. Google and GitHub prove who you are and nothing more — connect Concept2 afterwards from Settings.
Or try it without an account
Connect an erg and row a session from the plan: metronome, guided intervals, and the workout programmed onto the monitor. Nothing is sent anywhere — it is stored in this browser and nowhere else.
Needs Chrome, because Web Bluetooth exists nowhere else. Session analysis, training zones and the coaching insights need an account; you can export what you row and bring it with you.
Try it in this browser