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- This article is about the feature in the editor. For a list of extension blocks, see Blocks#Extensions.
- This article or section documents the current version of Scratch (version 3.0). For this article in Scratch 2.0, see Extension (2.0).
An extension is a block category that can be added to the Block Palette to extend the scope of the Scratch editor. Extensions make it possible to add more advanced functionality to projects, connect Scratch projects with external hardware (such as the LEGO WeDo and the micro:bit), and connect with software from the web (such as Google Translate and Amazon Text to Speech).
Adding Extensions
Extensions can be added by pressing the purple icon at the bottom-left of the screen under the block palette. This opens the Extensions Library, from which an extension can be chosen. Once chosen, the extension will show up underneath all of the other block categories in the block palette.
Removing Extensions
If an extension was added, but none of its blocks are used in the project, reloading the project will automatically remove the extension. In Scratch 2.0, it was possible to remove an extension by clicking its name in the "More Blocks" section and then clicking "Remove extension blocks".
Available Extensions
12 extensions are available on the Extensions Library in Scratch 3.0. Two extensions are web extensions which connect Scratch to external services from the internet, and seven extensions are hardware extensions which connect Scratch to an external device. Additionally, there is a hidden extension that is meant for testing purposes.
- Music — playing musical notes
- Pen — drawing with the pen
- Video Sensing — detecting camera movement
- Face Sensing — sensing faces with the camera
- Text to Speech — outputting speech from inputted text
- Translate — translating text with Google Translate
- Makey Makey
- micro:bit
- Go Direct Force & Acceleration
- LEGO MINDSTORMS EV3
- LEGO BOOST
- LEGO Education WeDo 2.0
- CoreEx — a hidden extension
The following extensions are only available on the Raspberry Pi release of Scratch:
Writing Extensions
Some features allow one to write one's own extensions.
JavaScript Extensions
This extension mechanism uses JavaScript to create the extensions. The documentation for creating this kind of extension for Scratch 3.0 can be found here.
Distributing Extensions
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This article or section documents something not included in the current version of Scratch (3.0). It is only useful from a historical perspective. |
An extension distribution strategy is still being worked out. The Scratch Team will probably host a small library of "supported" extensions.[citation needed] Users will be able to browse and select extensions from this library from within the Scratch editor. Supported extensions would be checked for quality and safety by the Scratch Team. There likely are strict criteria for including an extension in the Scratch Team-supported extensions library, such as command set clarity and ease of use, size of the potential audience, widespread availability of any associated hardware, and a long-term commitment to support the extension.[1]
Projects with experimental extensions cannot be shared on the Scratch website and will result in a pop-up message whenever a user tries to share a project with experimental extensions. Extension developers can share their extensions by distributing Scratch 2.0 project files (.sb2).[citation needed] Users can then use the "File > Upload from computer" command to import the project that uses the extension.
In addition, TurboWarp, a Scratch Modification, allows running custom extensions from the internet.
ScratchX
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This article or section documents something not included in the current version of Scratch (3.0). It is only useful from a historical perspective. |
- Main article: ScratchX
ScratchX was a gallery of experimental extensions that one could try out on the ScratchX website. The website could be found here. There were multiple Scratch extensions on ScratchX. It was discontinued in Scratch 3.0 due to the extensions being supported in the main Scratch editor, but it remained available to use here[dead link] until the discontinuation of Flash.
Scratch Lab
- Main article: Scratch Lab
Scratch Lab is a website made by the Scratch Team to test extensions that could possibly be added to Scratch 3.0. As of January 2025, 3 extensions, Animated Text, Video Sprites, and Face Sensing, are available. Scratch Lab can be found here.
See Also
- Adding Extensions via Developer Tools
- Developing Scratch Extensions (forum)
- Hardware that can Connect to Scratch
- How to Connect to the Physical World
- LEGO Education WeDo Robotics Kit
- Making ScratchX Extensions
- Remote Sensor Protocol in Scratch 1.4
- Scratch 1.4 Modifications
- Scratch Modification
- ScratchX
- Scratch Lab
References
