ScratchJr was developed by a collaborative team including Marina Umaschi Bers at Tufts University, Mitchel Resnick at the MIT Media Lab, and Paula Bonta and Brian Silverman at the Playful Invention Company.^[2][3] The project was given a $1.3 million grant from the National Science Foundation and raised additional funds on the Kickstarter platform.^[1] The initial release was launched in July 2014 for iPad; an Android version was released in March 2015 and a Chromebook app followed in March 2016.^[4] There is also a version called PBS Kids ScratchJr, which was released in partnership with PBS Kids in 2015.^[5][6] This version has sprites and backgrounds drawn from popular children's animated series such as Nature Cat and Wild Kratts.

Children create code in objects called sprites - which can be characters or other objects. ScratchJr comes with a library of sprites, and sprites can be edited or new ones created using the "Paint Editor".

The paint editor lets you paint in many different colours, with different thicknesses. You can also draw shapes and erase paint.

Code is created by dragging blocks into a coding area and snapping them together. All the blocks are completely icon-based (no text other than for values) which is how children can use this language before they can read. Blocks are connected from left to right, like words, contradicting the top to bottom connections that the original Scratch language uses. The main coding area is displayed at the bottom of the screen, with the stage in the center, the scene on the right, and the sprites on the left. Sprites are unique to each scene.

The user interface is much simpler than that of Scratch. Both the number of categories of programming blocks and the number of blocks within each category have been reduced, so that only most basic ones were retained.^[7]

In addition to sprites, kids can add backgrounds to projects, to give them a setting and atmosphere. Each background is treated like a page in a book, and has its own set of sprites. A project can have a maximum of 4 backgrounds.

ScratchJr is an app for developing computational thinking skills in elementary classrooms, especially in settings with pre-reading students such as Pre-K to 2nd grade.

It is used in a plethora of schools including many classrooms across Massachusetts. For instance, it is utilized by Kindergarten classrooms at the Eliot-Pearson Children's School in Medford, affiliated with the Tufts University, and in the Jewish Community Day School in Watertown, Boston.^[7]

ScratchJr is available in Catalan, Chinese, Dutch, Danish, English, French, German, Italian, Japanese, Norwegian, Polish, Portuguese, Brazilian Portuguese, Spanish, Swedish, Thai, Turkish and Welsh.

• Official website