Who Was At is a free Chrome extension developed by Aster, falling under the category of Browsers with a focus on Add-ons & Tools. This program aims to help users keep track of event attendees by providing a convenient list of people who have participated in their Luma Events. With Who Was At, users can easily access and review the guest list from their events.

The extension offers a simple and efficient way to maintain event attendance records, ensuring that users never forget who was present at their previous gatherings. By organizing attendee information in one place, Who Was At simplifies the process of managing event guest lists.