# Beste UI > Beautiful, accessible blocks, pieces and components for shadcn/ui and Tailwind CSS, built for React and Next.js. Install one with the shadcn CLI and the code is yours to edit: no runtime dependency, nothing to upgrade. Markdown rendition of https://ui.beste.co/tools/color-blindness. Every page on the site has one: add `.md` to any address, or send `Accept: text/markdown`. Whole catalog for LLMs: https://ui.beste.co/llms.txt. Registry index: https://ui.beste.co/r/registry.json --- [tools](/tools)/[color](/tools/category/color) # Color blindness simulator See a palette the way readers with protanopia, deuteranopia, tritanopia or achromatopsia see it, and get told which pairs collapse into each other. Color vision simulation filters ## A photograph The same picture through each kind of color vision. Green against red is where most of it goes. ![The sample photograph as seen with typical vision](https://images.unsplash.com/photo-1433888104365-77d8043c9615?q=80&w=2946&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D) Typical visionthe reference ![The sample photograph as seen with deuteranopia](https://images.unsplash.com/photo-1433888104365-77d8043c9615?q=80&w=2946&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D) Deuteranopiaabout 1 in 16 men ![The sample photograph as seen with protanopia](https://images.unsplash.com/photo-1433888104365-77d8043c9615?q=80&w=2946&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D) Protanopiaabout 1 in 100 men ![The sample photograph as seen with tritanopia](https://images.unsplash.com/photo-1433888104365-77d8043c9615?q=80&w=2946&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D) Tritanopiaabout 1 in 10,000 ![The sample photograph as seen with achromatopsia](https://images.unsplash.com/photo-1433888104365-77d8043c9615?q=80&w=2946&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D) Achromatopsiavery rare ## Your palette The colors you actually ship, run through the same simulation. A pair that ends up the same fill has lost whatever it was signalling. Palette Typical visionthe reference #22c55e#ef4444#f59e0b#3b82f6#a855f7 Deuteranopiaabout 1 in 16 men #a9a966#939239#bdbb00#7372f7#7575f6 Protanopiaabout 1 in 100 men #bbbb5e#6b6c46#abab15#7c7df6#6363f7 Tritanopiaabout 1 in 10,000 #52ba86#ef4441#fb935b#009bd0#8f80cb Achromatopsiavery rare #acacac#848484#b1b1b1#858585#808080 Every pair here stays distinguishable in all four simulations. That is a floor rather than a guarantee: color alone should still never be the only signal. ## Questions How is the simulation done?+ Each color is converted to linear light and passed through the standard confusion matrix for that deficiency, then converted back. It is the same approach the well-known simulators use. What counts as a collision?+ A pair that is distinguishable normally but falls under a 1.2:1 contrast ratio once simulated. Below that the two fills are effectively the same color, so anything you signalled with them is gone. What should I do about a collision?+ Carry the meaning twice. A label, an icon, a pattern or a difference in lightness all survive every deficiency, and lightness in particular is what the simulations here leave intact. ## Related tools [Color contrast checkerCheck a text and background pair against every WCAG 2 threshold at once, with a live sample in both sizes and the ratio as you adjust the colors.](/tools/contrast-checker)[Color palette generatorBuild a palette from one color using the classic hue relationships, each hue shown at five lightness steps and exported as @theme variables.](/tools/color-palette)[Color converterPaste a color in any notation and read it back in all of them, including OKLCH, Lab and Display P3, each one a click from your clipboard.](/tools/color-converter) Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · ## The tools are free. So is most of the library. 1935 blocks and 989 pieces for shadcn/ui and Tailwind, built on the same tokens these tools write. Install one with a command and the code is yours. [Browse the blocksBrowse the blocks](/blocks) No signup for the tools. MIT for free blocks, commercial licence for Pro. ## Ship the interface, keep the code. New blocks, pieces and components every week. Install one with a command and it is yours to edit. No runtime dependency, no upgrade path to fight. 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