whatsign.in is a free Chrome add-on developed by diogo.redin that aims to solve the problem of forgetting which social authenticator was used when logging into websites. This add-on keeps track of the social authenticator chosen during the first login and provides a convenient way to remember it for future visits.

The way it works is simple. When you visit a website and log in using a social authenticator such as Facebook, Twitter, or Google, whatsign.in registers the chosen authenticator. The next time you visit the same website, you can simply click on the extension and it will display the social authenticator you used before.

One useful feature of whatsign.in is the ability to "Forget" your chosen social authenticator. This allows you to choose a different one for the website, and the extension will register the new choice.

This add-on is a time-saver for those who frequently use social authenticators for website logins. It eliminates the need to create multiple accounts for the same website when forgetting which authenticator was previously used.

Please note that whatsign.in may not work on every website, as login buttons can be coded in various ways. However, the developers estimate that it works on approximately 90% of cases. If you encounter a website where it doesn't work, you can report it to the developers to help improve their algorithm.

Your data is stored locally on your computer using Local Storage, so there is no need to worry about your information being accessed elsewhere.

whatsign.in offers a 30-day money back guarantee with no questions asked, although there may be processing fees for refunds.

In the future, the developers plan to add manual addition of preferences, allowing users to save their preferences when the algorithm can't detect them. They are also exploring the use of machine learning methods to improve the algorithm's ability to detect login buttons in their various coding styles.