Tumblr Inactivity Checker is a Chrome extension developed by jrloprojects. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools subcategory. As the name suggests, this program allows users to easily discover any inactive Tumblr blogs they are following.

With Tumblr Inactivity Checker, users can specify a period of time, and the extension will display a list of blogs that have not posted within that timeframe. This feature is particularly useful for those who follow a large number of blogs and want to clean up their feed by unfollowing inactive accounts.

The extension is straightforward to use, with a simple interface that allows users to input their desired time period and view the results instantly. It provides a convenient way to manage your Tumblr feed and ensure you are following active and engaging blogs.

Overall, Tumblr Inactivity Checker is a handy tool for Tumblr users who want to keep their feed fresh and engaging by identifying and unfollowing inactive blogs.