Face Sensing Extension

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The Face Sensing extension as it first appeared to users when added to Scratch

The Face Sensing Extension is an extension that allows recognition of facial elements in Scratch projects. The extension was first added to Scratch Lab on February 2^nd, 2021, and was added to Scratch on October 7^th, 2025. The extension uses the Google BlazeFace model, which was chosen for its ability to run on the user's device without the need to transmit faces to an external server, and for its ability to recognize many different types of faces independent of ethnicity or other background.

Blocks

There are three hat blocks, two reporter blocks, one boolean block, and three stack blocks:

• go to [nose v]:: extension
• point in direction of face tilt:: extension
• set size to face size:: extension
• when face tilts [left v]:: extension hat
• when this sprite touches a [nose v]:: extension hat
• when a face is detected:: extension hat
• <a face is detected?:: extension>
• (face tilt:: extension)
• (face size:: extension)