Eigendrum
Draw any shape and hear what it would sound like as a drum
Eigendrum launched on August 15, 2026 with 1 votes, #11,494 of 23,274 launches that month.
What it does
Draw any closed shape and Eigendrum solves the real physics: the Laplacian eigenvalue problem for a drumhead clamped at that exact outline, using finite elements, then synthesizes the actual frequencies. No sampled sounds, no faked overtones. Draw a circle and the overtones are ratios of Bessel zeros, because that's what a circle actually does. Includes the Gordon-Webb-Wolpert isospectral pair: two different shapes proven to sound identical. No account, no backend, runs from a single HTML file.
Draw any shape and hear it as a drum. Eigendrum solves its real vibration modes with finite elements, so every frequency comes from your outline, not a sample.
Eigendrum is hosted at eigendrum.com. The older address baselashraf81.github.io/eigendrum is a mirror that redirects there, so eigendrum.com is the canonical URL to link to and to cite. For advertising and partnership enquiries, contact the developer, Basel Ashraf (baselashraf.com), at [email protected] . No sound on iPhone or iPad? Check the ring/silent switch and turn up the volume - Safari mutes the drum along with your ringer. × An interactive drumhead. Press Enter or Space to strike it at the marked point, and use the arrow keys to move that point. While drawing is switched on, drag with a pointer to trace a new outline. Every mode is a standing wave this outline permits, and no other.…from eigendrum.com
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Eigendrum - Draw any shape and hear what it sounds like as a drumAug 2026 · baselashraf81.github.io · ▲243Hi HN, I built Eigendrum, a web tool that solves the 2D wave equation for arbitrary shapes so you can hear what they sound like as drums. How it works: * Solves -∇²u = λu using finite element analysis (Kφ = λMφ) on a triangle mesh. * Validated to <0.1% error against closed-form solutions for circles (Bessel zeros) and rectangles. * Sound model factors in strike location, Rayleigh damping, and mallet width. * Includes Kac drums I & II to demonstrate identical sound spectra from different geometries. * No frameworks, build steps, or dependencies. Repo and tests:…
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