(…) Letting a third-party app read your emails is a scary proposition. That’s why Deseat.me uses Google OAuth to sign into Gmail, and then the app runs entirely on your computer. Your private data isn’t sent to the cloud, according to the developers.
So here’s how it works. Sign in with Google, and give Deseat.me a few minutes to show you a list of all the accounts you have signed up for, where you provided your Gmail address. (…)