"Thoughtful" is a free Chrome browser add-on developed by nazarioricardo in the Browsers category, specifically under Add-ons & Tools. This program aims to assist users in staying focused by blocking distracting websites. By adding sites to a list, users can prevent themselves from accessing them easily.

The unique feature of "Thoughtful" lies in its approach to website blocking. Instead of simply restricting access, it prompts users with options when attempting to visit a blocked site. Users can choose to go back, select another website from a personalized list, or even answer a question about their intent. This interactive method encourages mindfulness and provides a chance for users to reconsider their actions, promoting productivity in a more positive manner.