Ondelu simulates the mesmerizing physics of rheoscopic fluid — a shimmer that responds to your every touch and tilt.
How it works
Ondelu runs a full fluid simulation on your GPU — the same mathematics that governs real liquids, executed 120 times per second.
Drag to stir. Tap for a radial ripple. The fluid responds to every gesture with physical momentum.
Tilt your phone and pigments shift under gravity. Lay it flat and the fluid settles into silence.
Millions of microscopic flakes orient in the flow, catching light like real pearlescent ink.
Five compute shader passes per frame. Navier-Stokes pressure solving at full display resolution.
When still, energy fades naturally. When you move, the fluid wakes up. No jarring transitions.
No UI chrome. No distractions. Just the fluid and the glow of your screen at night.
Ondelu Plus
Unlock handcrafted palettes — from silver pearl and liquid copper to iridescent slick that shifts between hues as the fluid moves.
Slick — shifts between two vivid hues as the flake field evolves. Like oil on water, or a beetle's shell.
Free to download. Graphite palette included. Ondelu Plus unlocks seven more colours.
Download on the App Store