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The "Portable Colour Contrast Analyser" (PCCA), developed by Ken Herbert, is a robust and indispensable tool for anyone committed to ensuring digital accessibility. This software is designed to help web designers, developers, and accessibility experts evaluate the color contrast ratios of digital content, ensuring compliance with the Web Content Accessibility Guidelines (WCAG).

One of the standout features of PCCA is its portability. Unlike many other accessibility tools that require installation, PCCA can be run directly from a USB drive or any other portable storage device. This makes it incredibly convenient for professionals who need to perform accessibility checks on multiple devices or in various environments without the hassle of repeated installations.

The user interface of PCCA is both intuitive and user-friendly. It allows users to easily select foreground and background colors using a color picker or by entering hexadecimal color codes. The software then calculates the contrast ratio and provides a clear pass/fail indication based on WCAG 2.1 standards, covering both normal text and large text requirements.

Beyond its primary function of contrast analysis, PCCA also offers additional features that enhance its utility. For instance, it includes a color blindness simulator, which helps users understand how their content will appear to individuals with different types of color vision deficiencies. This feature is particularly valuable for creating inclusive designs that cater to a wider audience.

Performance-wise, PCCA is lightweight and efficient, delivering quick and accurate results without consuming significant system resources. Its open-source nature also means that it is continually being improved by a community of developers, ensuring that it stays up-to-date with the latest accessibility standards and user needs.

In summary, the Portable Colour Contrast Analyser by Ken Herbert is a powerful, portable, and user-friendly tool that excels in helping professionals ensure their digital content is accessible to all users. Its combination of ease of use, comprehensive features, and adherence to accessibility standards makes it an essential addition to any digital accessibility toolkit.