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Visual block syntax for programming languages
JavaScript HTML CSS
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"It goes against the grain of modern education to teach children to program. What fun is there in making plans, acquiring discipline in organizing thoughts, devoting attention to detail and learning to be self-critical?" --Alan Perlis


Waterbear is a toolkit for making programming more accessible and fun. Not a language itself, but a block syntax inspired by Scratch ( that can be used to represent languages. Waterbear's blocks drag and snap together, representing code that eliminates syntax errors much like garbage collection alleviates memory errors and bound checking helps prevent overrun errors.

Waterbear's system of draggable, snappable blocks, are built using clean HTML5, CSS3, and Javascript. The goal is not to slavishly duplicate Scratch, or to create a programming language, but to create a visual syntax tool that can be used with a variety of languages and projects.

The motivation is to reduce syntax errors in the same way that garbage collection has reduced memory errors, or bounds checking has reduced overrun errors. I have also been testing various programming systems on my own kids, and Scratch is the one tool they were able to pick up easily, both for creating projects and for reading/modifying other people's projects. Waterbear is a way of relaxing some of the restrictions imposed on Scratch, and opening it up to the web at large.

The look and feel of Waterbear differs from Scratch, which is implemented in Squeak Smalltalk's Morphic environment. Waterbear blocks are intended to use web technologies naturally, without trying to force them into a different paradigm. In other words, this project is attempting to create blocks in a web-centric way. Waterbear is designed to be easy to use on both desktop/laptop browsers and on iPads and smart phones.

Waterbear is pre-alpha software, very raw, and in constant flux right now.

For further info:


Copyright 2011 Dethe Elza

Waterbear code licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Creative Commons License
Waterbear Documentation by Dethe Elza is licensed under a Creative Commons Attribution 3.0 Unported License.
Permissions beyond the scope of this license may be available at

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