Whodis (Alpha) is a Chrome add-on developed by Ashwin Sinha. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools program. This free program allows users to privately add custom notes to Twitter profiles.

With Whodis, users can easily keep track of people on Twitter by saving private notes. This feature is particularly useful for individuals who want to remember important details about specific Twitter users, such as their interests, preferences, or any other relevant information. By adding these custom notes, users can ensure that they have a comprehensive understanding of the individuals they interact with on Twitter.