Simulate protanopia (red-blind) color vision — a typed shortcut over cvdsim / the OpticQuiz engine (Machado, Oliveira & Fernandes 2009).

Pierre theme for Shiki, VS Code, and more

Generate, check, and fix colorblind-safe color palettes — protanopia, deuteranopia, tritanopia. Built on the published OpticQuiz engine (Machado 2009 + CIEDE2000) with the Okabe-Ito safe palette.

See a color, a palette, or a whole image as a colorblind person does. Recolors PNG/JPEG for protanopia, deuteranopia, and tritanopia — built on the published OpticQuiz engine (Machado, Oliveira & Fernandes 2009).

Generate Ishihara-style pseudoisochromatic color-vision test plates — a digit hidden in a dot field that collapses under protanopia, deuteranopia, or tritanopia. Reproducible from a seed. Built on the OpticQuiz engine (Machado 2009 + CIEDE2000).

Simulate the three dichromacies — protanopia, deuteranopia, tritanopia — for a color or a whole image. Umbrella over cvdsim / the OpticQuiz engine (Machado 2009).

klar plugin: color-vision-deficiency confusability metric for full dichromacy (Brettel 1997) — deuteranopia, protanopia, tritanopia.

Accurate, zero-dependency color-blindness (CVD) simulation for colors & images — protanopia, deuteranopia, tritanopia & more — plus distinguishability checks (will users tell two colors apart?). CLI + library, 100% local.

Simulate color blindness by converting RGB hex codes

Simulate color blindness

A Blockly theme for people that have deuteranopia.

A TypeScript library for accurate color blindness simulation using the Brettel-Viénot-Mollon algorithm

Parse, convert and manipulate colors across hex, RGB, HSL, Lab, LCH, OKLCH and CMYK, with WCAG contrast checks and CSS variables. Zero dependencies.

Is your palette colorblind-safe? Check and fix color palettes for color-vision deficiency (protan, deutan, tritan) with the published OpticQuiz engine — Machado 2009 + CIEDE2000.

Physically accurate colorblindness simulation — three models (Viénot, Machado, Brettel), sRGB linearization, gamut mapping. Zero dependencies.

Simulate color blindness by converting RGB hex codes

Nice2Dev Graphics Editors — Pixel, Vector, Photo and Animation editors for React

Color accessibility engine. Checks palettes for colorblind-safety (protan/deutan/tritan, Machado 2009, scored with CIEDE2000), fixes failing palettes, and checks WCAG contrast. Zero dependencies.

Color Blinder Simulate color blindness of the given valid color hex code

Generate structured, deterministic color palettes from a small set of inputs. Ramps, semantic tokens, and optional palette variants.