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forkphorus runs Scratch 2 and Scratch 3 projects really fast by compiling them to JavaScript. Try it out by pasting a project ID or URL into the field below, selecting a project file, dropping a file on the page, or exploring the examples studio.

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forkphorus is still in development. Click here to report a problem with this project. You can also comment problems here if you don't have a GitHub account.

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Changes are applied automatically.


forkphorus is a fork of phosphorus by Nathan. Its CPS-style compilation and overall design was inspired by Rhys's sb2.js. It would have more bugs if not for Truman and Tim. The JSZip library is used to read .sb2 and .sb3 files.


The source code for forkphorus is available on GitHub.

Version e45dfdc, updated 2020-02-19