You can log in to Netradar using your Google account.
Netradar gets a unique identity code about you from Google so that your personal network measurements can be shown only to you. Netradar does not have an access to any other information of you from Google.
If you already have an active session in Google services, you will be shown your measurements right after clicking the Google logo below. Otherwise, Google will ask you to log in and grant Netradar an access to your identity code.