Free · Watch grains pass through a neck

Cellular Sand Timer for Kids

Fill a clear timer with golden sand and watch each tiny grain pass through the narrow middle.

  • Clear, kid-friendly steps
  • Private in your browser
  • No signup

Creative cell experiments

Cellular sand timer

Fill the top chamber with sand and watch each grain pass through the narrow middle.

Active cells 0 Steps 0 Brush Sand Opening experiment
The timer walls are ready. Add more sand or start motion to watch it fall.Draw on the experiment. Arrow keys move the keyboard cursor; Enter paints.

Runs only in this tab with Sandspiel’s local WebAssembly core. No login, gallery, chat, ads, uploads, or saved creations.

Powered by Sandspiel, an open-source library available under MIT.

Three simple steps

How to use it

  1. Choose a material and draw on the large experiment area.
  2. Pick a motion speed, then start, pause, or undo while the cells change.
  3. Reset to restore the starter scene. Nothing is uploaded or saved.

Private by default

Your words and choices stay in this browser tab. There are no accounts, uploads, ads, or trackers inside the tool. Close the tab and the working data is gone.