SandCastleIcon.png This page has links to websites or programs not trusted by Scratch or hosted by Wikipedia. Remember to stay safe while using the Internet, as we can't guarantee the safety of other websites.
A February 4, 2014 meeting on a Scratch app for tablets.

Scratch is currently available on desktops and mobile devices with Scratch 3.0. However, mobile devices can not use keyboard controls, which are essential for many projects. Scratch is currently not available as a mobile app, though the Scratch Team is developing an app for larger mobile devices. ScratchJr is an app for tablets but has limited functionality.

Mobile Application

There was a tablet version of Scratch in development. @MIT Media Lab tweeted this spoiler on February 4, 2014:

Mitch Resnick leads an early design exploration for a tablet version of #Scratch

– @MIT Media Lab

Prior to this major leak, Mitch Resnick replied to a question on his profile with:

We're working on a version of Scratch for iPad (and other tablets). It will be ready sometime next year.[citation needed]

He has also hinted at some unique capabilities tablets can provide for Scratch which computers cannot, like the use of physical features like gyroscopes.

Yes, as we develop Scratch for tablets, we plan to provide access to the special sensors on tablets (similar to the way we now provide access to the webcam with the video-sensing blocks)

– mres, September 25, 2013[1]

History

Archive.png
The subject of this article or section has changed dramatically and requires updating. Please keep in mind that some of the information or images may not be accurate or relevant to the current version of Scratch, the Scratch website, or the article subject. (April 2019)
Specifically: Outdated by Scratch 3.0 release

The Scratch Viewer was the first application created to play Scratch projects on mobile devices, specifically Apple's iOS. It was made by John McIntosh of Smalltalk Consulting Ltd, a Canadian programmer with no prior affiliation with the MIT Media Lab. In April 2010, Apple removed the application from from the iTunes store because it violated Section 3.3.1 of the company’s policy against applications that interpret or execute code.

After the Scratch Viewer's demise, other Scratchers started attempting to make project viewers based on the HTML5 canvas element, which can be run on most mobile devices. The first two such programs were Go Everywhere!, by comp500, and the HTML Viewer, by Johnnydean1.[citation needed] The HTML Viewer officially stopped development, but was picked up again by two of its members, MidnightLeopard and MathWizz, who are developing JsScratch based on its old code and a JavaScript library known as Morphic.js. Go Everywhere is still in active development, but is far from usable.

The Android Scratch Player is a player made by ZeroLuck specifically for the Android operating system. It is currently in alpha stage.

RHY3756547 started creating his own HTML5-based player for Scratch 2.0, called sb2.js. It reads the Scratch 2.0 File Format, and compiles it to Javascript code.

The Scratch Team is still in the progress of designing the official HTML5 Player for Scratch 2.0. They have released the source code to the public and are seeking help on this forum topic. The source code can be accessed here. The HTML5 player must be hosted on one's own website, as there is no official testing area yet on Scratch.

Pyonkee is an app which bases Scratch 1.4. It's the only complete and still running extension which bases Scratch on tablets.

Problems

No matter how well an HTML5 player works on a desktop computer, it will likely not work as well on a mobile device for a few reasons:

  • Mobile devices are often not as good as interpreting code as desktop computers
  • Mobile devices do not have a real keyboard, so key interaction is made difficult
  • Exact clicking on a mobile device is made difficult by the necessity of using a finger as the mouse. There has to be more space in order for touchscreen to be possible

The native Scratch application also doesn't work, due to the Squeak VM not supporting mobile devices. If the tablet supports either the Flash Player or Java Player, the project could be played in it. For Scratch 2.0, the project could be edited, albeit with the difficulties mentioned above, if the device supports Flash.

References

  1. http://scratch.mit.edu/users/mres/#comments-378966