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Accessibility measurement methodology

The tools and calculations we use to measure accessibility.

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Index CSGOV

A ranking of Czech websites comparing their accessibility and speed according to internationally recognised metrics.

Categories and rankings

Measured websites organised into thematic categories

Measurement methodology

Index CSGOV evaluates public administration websites in two areas: accessibility and performance. Combining both metrics produces the overall ICS score (Index CSGOV Score).

Performance measurement methodology

The performance score expresses how fast a website loads and responds to user interactions.

Measure accessibility and performance of your website

Find out how your website is doing in terms of accessibility and speed.

Pricing

Monitor the accessibility of your website. Free for public oversight, a paid version for professional management.

What are false positives in accessibility testing

Not everything that looks like an error really is one. That is the case with false positives. What are they, why do they occur and how can they be identified?

Index CSGOV – first measurement

Description

The initial version of the measurement and scoring methodology. The A11Y score is calculated using Pa11y with axe-core and HTML CodeSniffer tests. Errors are weighted with decreasing weights. Moderate and minor issues are tracked but not penalised.

More precise colour contrast detection

Description

Colour contrast checks in axe-core that return "needs review" (cannot be verified automatically) are now classified as warnings instead of errors. This concerns websites with complex backgrounds, gradients or CSS custom properties, where automated tools cannot reliably determine the contrast ratio. More about false positives in accessibility.

Changelog

Find out what has changed in the accessibility measurement.

Terms and Conditions

Privacy Policy

Accessibility Statement

225 audits, 226 thousand issues. What really breaks the accessibility of Czech websites?

Website accessibility is often only addressed when an audit, a complaint or a problem arrives. Instead of individual checks, we looked at the data at scale.

Blog

News, changes and interesting facts about the Index and about accessibility in general.

Improved website details

Description

We now automatically load the website name and, if it exists, also its meta description as the website description.

What is Index CSGOV

The only tool that combines website accessibility and performance measurements into a single score.

2,500 days of the accessibility act: where we are and why we keep meeting the same errors

As of today, 10 February 2026, the Act on the Accessibility of Digital Services No. 99/2019 Coll. has been in force for exactly 2,500 days.