Sim Daltonism

What Is Sim Daltonism?

Sim Daltonism is a free accessibility tool that simulates how colors appear to people with various types of color blindness. Available as apps for iOS and Mac, Sim Daltonism helps designers and developers check color perception in real-world contexts by filtering live camera feeds or screen regions. It fits into the design workflow during color selection, UI testing, and accessibility audits to ensure visuals remain distinguishable for users with color vision deficiencies.

What Sim Daltonism Does

• Simulates multiple types of color blindness, including protanopia, deuteranopia, tritanopia, and their anomalous variants.
• Filters live video from the iOS device camera in real time to show color perception under color blindness conditions.
• Provides a filter window on Mac that overlays and processes the content beneath it according to selected color vision simulations.
• Displays filtered results in a floating palette or window for immediate visual comparison with original colors.
• Uses OpenGL-based algorithms adapted from established color blindness simulation methods for accurate rendering.
• Operates as open-source software, allowing code inspection and contributions under the Apache 2.0 license.

How Sim Daltonism Can Be Used

• Point the iOS camera at physical prototypes, printed designs, or environments to preview color blindness effects during early sketching or client presentations.
• Hover the Mac filter window over website mockups, app interfaces, or graphics software to test color contrast without exporting files.
• Switch between color blindness types to iterate on palettes during UI design reviews, ensuring buttons, charts, and icons remain accessible.
• Integrate into development workflows by capturing screen areas of running apps or browsers for on-the-fly accessibility checks.
• Use in team collaborations to demonstrate color perception differences, such as comparing original and simulated views side by side.

Who Is Sim Daltonism For?

Sim Daltonism serves UI/UX designers, web developers, and graphic artists focused on inclusive design practices. It suits professionals auditing color choices for websites, mobile apps, data visualizations, and branding materials to meet accessibility standards like WCAG. Experience levels range from juniors learning color theory to seniors conducting final QA, particularly in projects requiring broad audience reach. Color blindness simulators like Sim Daltonism aid those addressing color vision deficiencies in digital and print media. Visit Sim Daltonism