Build Your Own Blocks

 Run Snap!

 Snap! 5

What do you get if you combine

• drag-and-drop interface
• visual metaphors for loops,  
    conditionals, etc.
• easy animation tools
from Scratch
• first class procedures
• first class lists
• first class objects
• first class continuations  
from Scheme


You get a broadly inviting programming language for kids and adults that’s also a platform for serious study of computer science. (See the About page for details.)


Animated tree

Path Finder

Space Invaders



Interactive tree


Count change

Y combinator

Animal game


Roman numerals

Teachers, check out the Beauty and Joy of Computing, an AP CS Principles course using Snap!.
(AP CSP info for students; info for teachers)

Snap! is the current version. Try out the language at (the button above).

Need help?Read the Reference Manual.
Manual updates:First class sprites
Linked lists
Block Enhancements
Still have a question?    Ask on our forum.
Found a bug?Report it at our Github repository.
Looking for BYOB3?    Download it here.

You can now run Snap! offline in your browser. Click the link for instructions.

Turn your project into a standalone executable!

First “Export project” and save the resulting XML file. Then go to

Import Scratch 2.0 projects

Go to Snapin8r2

Use devices with Snap!:

More Snap! extensions for CS education

Mirror Sites

If is ever unavailable, you can run Snap! at any of these mirror sites: We recommend bookmarking these now, while this site is up!
Browser Requirements

Browser  Minimum  
Additional Notes
Chrome54Chrome is currently the recommended browser for Snap!
IEnoneInternet Explorer will not work with any version.

For mobile browsers:

DeviceVersion Notes
iPhoneiOS 8 or higher. However on iOS, uploaded sound files can't be played in a script. (All iOS versions have this restriction.)
Android    Use Chrome for Android and not the stock browser that comes with some devices.

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See our complete privacy policy here.

Thanks to...


This material is based upon work supported by the National Science Foundation under Grants No. 1138596, 1143566, and 1441075. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation or other funders.

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