Snap! (Build Your Own Blocks) 4.2

Build Your Own Blocks

Run Snap!
now

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.)

Examples:

Animated tree	Path Finder	Space Invaders
Snake	Menuet	Interactive tree
Swimmer	Count change	Y combinator
Animal game	Joke	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! 4.2.2.9 is the current version. Try out the language at https://snap.berkeley.edu/run (the button above).

Need help?	Read the Reference Manual.
Manual updates:	First class sprites
	Tables
	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 http://snapp.citilab.eu/

Import Scratch 2.0 projects

Go to Snapin8r2

Use devices with Snap!:

Orbotix Sphero guide by Connor Hudson and Dan Garcia
Lego NXT package by Connor Hudson
Nintendo Wiimote package by Connor Hudson
Finch and Hummingbird robots package by Tom Lauwers
Parallax S2 robot package by Connor Hudson
LEAP Motion by Connor Hudson
Speech synthesis by Connor Hudson
Arduino package by Alan Yorinks
Arduino package by Bernat Romagosa/Citilab
Fischertechnik ROBOTICS TXT Controller by Richard Kunze
Snap! for Raspberry Pi by rasplay.org

More Snap! extensions for CS education

snap-apps.org provides Edgy for graphs, Cellular for multi-agent simulation, and more.
Netsblox for multiplayer networking.

Mirror Sites

If snap.berkeley.edu 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 Version Required	Additional Notes
Chrome	54	Chrome is currently the recommended browser for Snap!
Safari	10.1
Firefox	47
Edge	12
Opera	32
IE	none	Internet Explorer will not work with any version.

For mobile browsers:

Device	Version Notes
iPhone	iOS 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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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.