Vaccine Slot Tracker is a free Android app developed by Pepper Bytes, designed to track the availability of vaccines in India. The app helps users to get notified about the vaccine availability in their saved PIN codes or districts.

Users can save up to three PIN codes or districts as their favorite and get notification updates when the vaccine is available. The app sends notifications about the availability of vaccines in the user's saved PIN codes or districts. The app also allows users to change their notification preferences to get updates every two minutes. By default, notification updates occur when the vaccine is available in the saved favorite.

The app provides a detailed report of all vaccination centers' vaccine availability on clicking the notification. It falls under the lifestyle category and the health and fitness subcategory.