What is Eigendrum?
Eigendrum lets you draw any shape and hear what it would sound like as a drum. Instead of playing a recording, it computes the real vibration modes of your outline with the finite element method, so every frequency you hear comes from the shape itself.
Tap the drumhead to strike it, move the striking point to hear how the sound changes, and see where the overtones fall and where the nodal lines sit. You can start from a circle, square or rectangle, draw your own outline or enter an equation, then copy a link or download the sound. It is open source on GitHub and was a popular Show HN in 2026.
Main Features
- Draw any shape and hear it as a drum
- Real vibration modes, not samples
- See overtones and nodal lines
- Change where you strike the drum
- Share a link or download the sound
- Open source
How to Get Started with Eigendrum
- Open eigendrum.com and switch sound on.
- Tap the drum to strike it.
- Turn on drawing and trace a new outline.
- Strike different points and compare the sound.
Eigendrum Pricing
Eigendrum is free in your browser. The developer accepts donations.
Who Should Use It?
- Musicians and sound designers
- Physics and maths students
- Anyone who likes playful science toys
Eigendrum Alternatives
- Chrome Music Labmusic experiments in the browser
- The Duck Pondreal-time synthesized duck sounds
- Patatappress keys to make sounds and shapes
Frequently Asked Questions
Is Eigendrum free?
Yes. It is free in your browser and open source.
How does Eigendrum make its sound?
It solves the real vibration modes of the shape you draw with finite elements, so the frequencies come from your outline, not a sample.
Why does Eigendrum sound different when I tap another spot?
Modes with a nodal line under the mallet stay silent, so the same drum sounds different depending on where you hit it.