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pbj sandbox

A free physics simulation — play it in your browser, no install. 2D point-based physics sandbox 🥜🍇🏖. A point-based jelly physics sandbox, with several tools to construct shapes and scenes. You can check it out here. This should be considered a toy. However, since this is a topic I care about, I like to think about ways users can lose data, and I've documented…

by @1j01 · 1j01/pbj-sandbox on GitHubLANG JavaScript★ 20HOSTED ON 1J01.GITHUB.IOUPDATED 4 Jan 2026

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From the README

A point-based jelly physics sandbox, with several tools to construct shapes and scenes.

You can check it out here.

This should be considered a toy. However, since this is a topic I care about, I like to think about ways users can lose data, and I've documented it here.

There's no save/load. And the clipboard is internal, so you can't use it as a workaround to save/load. Everything is lost if you close the tab.

Furthermore, if the simulation is active, undo/redo is destructive, because the states will be replaced with ones further ahead in time, as you go back and forth.

Read the full README on GitHub →

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