RGBlind: Color Blind Tools

RGBlind is the complete, free color vision toolkit — a scientifically-accurate simulator, a color vision test, a WCAG contrast checker, and a color-blind-safe palette generator, all in one app. Built for both color-blind users and the designers who build for them. No signup, no subscription, works offline.

SIMULATE & CORRECT
• Live camera simulation in real time
• Photo simulation from your gallery
• Daltonize correction — shift colors so red/green and blue/yellow cues become visible
• Save the filtered image straight to your gallery, or share it to any app
• Tap and hold a photo to compare with the original
• Color sampler — tap any pixel to see its true color and how it appears to you
• Severity slider (0–100%) for partial deficiencies (anomalous trichromacy)

COLOR VISION TEST
• Screen your color vision with classic pseudoisochromatic plates
• Instant scoring with a plain-language interpretation
• Not a medical diagnosis — a fast, private screening aid

WCAG CONTRAST CHECKER
• Enter any two colors (with a built-in color picker) and get the exact contrast ratio
• AA / AAA pass or fail for normal and large text
• See how the pairing reads for color-blind users (simulated contrast per deficiency)

COLOR-BLIND-SAFE PALETTES
• Published safe palettes (Wong, Paul Tol) that stay distinguishable across vision types
• Preview any palette as protanopia, deuteranopia or tritanopia
• One-tap copy of any hex code

VISION TYPES SUPPORTED
• Normal
• Protanopia (red-blind) & Protanomaly
• Deuteranopia (green-blind) & Deuteranomaly
• Tritanopia (blue-blind) & Tritanomaly
• Achromatopsia (total color blindness)

PRIVACY FIRST
Camera frames and photos never leave your device. The app shows ads via Google AdMob, which collects a non-permanent advertising identifier you can reset any time in your device settings. Full policy: https://rgblind.com/privacy

SCIENCE
Vision simulation matrices: Machado, Oliveira & Fernandes (2009). Correction algorithm: Fidaner, Lin & Ozguven (2005).

LANGUAGES
English, Dutch, French, German, Italian, Portuguese, Spanish.

No registration. No subscription. No internet required for the tools.