Your accessibility score tells you, at a glance, how accessible your website is: a single number from 0 to 100. The higher the score, the fewer and less severe the issues your visitors run into.

The short version

Your score reflects how many elements are failing, weighted by severity. Every element you fix raises your score, and the most severe issues, and those repeated across the most pages, count the most.

Three things shape it:

Severity matters. A failing critical check, like a missing form label, hurts your score far more than a low-severity one.
Repetition adds up. The same problem across many pages counts more than a one-off, so site-wide issues stand out.
Partial progress counts. Fix one element and your next scan reflects it. Clearing the last one in a check gives the biggest lift.

How scoring works

Each scan tests your pages against a list of accessibility checks based on the WCAG standard, like "Images must have alternative text." For each check, we look at every matching element on every page and record whether it passes or fails. An element is a single thing a check looks at, like one image or one form field, and the same image on five pages counts as five occurrences.

When the same issue repeats across pages, Marker.io groups it into one item in your fix list, so you fix it once and every occurrence passes on the next scan.

Each check has a severity that sets its weight:

Severity	Weight
Critical	10
Serious	5
Medium	2
Low	1

Each check earns a score from how many of its elements are failing. A check with nothing failing scores full marks, and the more failing elements, the lower it scores. We average these scores across all checks, weighted by severity. A Critical check counts ten times as much as a Low one, so clearing your Critical issues moves the score fastest. For the full list, see Accessibility checks and their weights.

You'll see the score in two places. Your website score covers every page you scan. A page score covers just one page. Fixing an element helps both.

Moving your score

Impact on score shows the points you'd gain by clearing a check. Sort by it to tackle the biggest wins first.
Fix it in your code/content, then rescan. Failing elements move to passing and your score rises.
Mark as resolved to credit a fix right away. If the next scan still finds it, it returns.
Ignore false positives or issues that don't apply to you. Ignored elements don't count against you.

Score levels

Your score falls into one of three levels, each with a color and a headline:

Score	Color	Headline
90-100	Green	Good accessibility
50-89	Orange	Needs improvement
0-49	Red	Poor accessibility

Green is deliberately hard to earn. Your site needs a score of 90 or above to reach it, in line with Lighthouse, so a green score is a strong signal your site is broadly accessible on the automated checks.

Is a high score the same as compliance?

No. Marker.io's checks are automated, and automated testing catches only part of WCAG (industry estimates put it around 30 to 50% of success criteria). It can't judge whether alt text is meaningful or whether your site works end to end with a screen reader.

So treat your score as a strong, continuous signal of your site's health, not a certificate of compliance. To confirm you meet a standard like WCAG, the ADA, or the European Accessibility Act, you still need a manual audit by an accessibility expert. Marker.io gets you there faster by surfacing and tracking the automated issues, so your audit starts from a stronger baseline.

Need that audit? Contact us and we'll put you in touch with our accessibility partners, who can review your site and deliver a full compliance audit.

Frequently asked questions

Why is my website score lower than the average of my page scores?
Your website score isn't an average of page scores. We calculate it across your whole site at once, pooling every failing element on every page. A problem on many pages counts as many failing elements, so it weighs more site-wide than on any single page. One image missing alt text across 20 pages is a small ding on each page, but the same issue 20 times over across the site, so it pulls the website score below the page average. That's intentional: a problem repeated everywhere matters more than a one-off.

How does my score compare to Lighthouse?
A single page's score usually lands within a few points of Lighthouse. Two things can still create a gap. First, your website score covers your whole site, so a problem repeated across many pages pulls it below any single page. Second, tools check slightly different rules and weight severities differently. Marker.io also credits partial fixes per element, so progress shows up on your next scan.

When does my score update?
After each scan. Marking elements as resolved or ignored updates it at once. Fixes in your code show up on your next scan.