Frax

A sleek WebGL fractal explorer with zoom-to-cursor, curated dark palettes, multiple fractal types, and one-click screenshots - all in a single HTML file.

▶ Live demo

Gallery

Features

• Zoom to cursor (mouse wheel) with adjustable Zoom amount
• Multiple fractals: Mandelbrot, Multibrot-3/4/5, Burning Ship, Perpendicular Burning Ship, Celtic, and Julia (with C controls)
• Curated palettes, including static and dynamic hue-shifting colour schemes
• Auto-zoom play/pause with speed control
• One-click Screenshots (PNG)
• Minimal, modern UI with live HUD (center, scale, iterations, FPS)
• No dependencies (vanilla JS + WebGL)

Quick start

To run the demo online: Launch the live demo
Altternatively, download and open frax_v2.23.4_release.html in any modern browser (e.g. Chrome/Edge/Firefox).

Controls

Mouse

• Wheel: zoom to cursor
• Drag: pan

Top bar

• Auto zoom ▶ / ❚❚ and Speed
• Fractal (drop-down). Julia shows C = a + bi inputs (0.1 steps)
• Palette (colour)
• Detail (iteration bias)
• Zoom amount (wheel sensitivity)
• Reset · Screenshot

Shortcuts

• P play/pause auto-zoom
• R reset view
• S save screenshot
• [ / ] previous/next palette

Fractals

• Mandelbrot family: Mandelbrot, Multibrot-3, Multibrot-4, Multibrot-5
• Burning Ship variants: Burning Ship, Perpendicular Burning Ship
• Other: Celtic
• Julia: editable C (Re/Im) fields; behaves differently than the others

Palettes

Oceanic (default), InfernoLite, Aurora, Velvet, Mono, Classic, Sunset, Neon, Forest, Icefire, Magma, Twilight, Copper, Candy, Midnight, Solar, Lavender, Spectrum (cycle).

Performance notes

• Fragment-shader escape-time with smooth coloring (ν = n + 1 − log(log |z|)/log 2)
• Dynamic iteration target scales with zoom; detail slider nudges the bias
• Device pixel ratio is clamped for performance; FPS shown in the HUD

License

CC0 1.0 Universal — Public Domain Dedication.
You can copy, modify, distribute, and use Frax, even commercially, without asking permission. See LICENSE for details.