No gap too small.
Tiny problems can stop someone from using your site. Find them free.
Free. No sign-up. Results in about a minute.
What it looks for
Hard-to-read text Pictures with no description Unclear boxes and buttons Keyboard traps Zoom and spacing problems Missing signposts PDFs screen readers can't read Accessibility widgets
Text whose color is too close to the background.
Pale gray words on white. The contrast is only 2.1 to 1. Normal-size text needs at least 4.5 to 1.
Library hours
Monday to Friday, 9 am to 5 pm
Closed on holidays
The same words in dark gray: 12.6 to 1, easy to read.
See more hard-to-read text examples
Pictures with no description
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Or a description that says nothing, like a file name.
A screen reader reads out the file name. The listener learns nothing.
“New trees planted along the park trail, image”
A short description tells them what the picture shows.
Unclear boxes and buttons
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Form boxes, links and buttons that don't say what they are for.
No label and a button with only an icon. Nobody hears what they are for.
Search the site
Search
“Search the site, edit text. Search, button.”
A visible label and a button that says what it does.
See more link and button examples
We press Tab through the page to find where the keyboard gets stuck, lands on hidden things, or can't be seen.
Pressing Tab keeps landing on the map. Keyboard users can't get past it.
Home → Map → Contact
“Contact, link.”
Tab moves on to the next thing, and a clear ring shows where you are.
Zoom and spacing problems
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Pages that block zooming, run off the screen at 400%, or cut off text when people add spacing.
Zoomed to 400%
Pay your water bill online
Zoomed in, the words run off the edge and get cut off.
Zoomed to 400%
Pay your water bill online
The words wrap onto the next line, so everything stays readable.
Page titles, headings, language and other signs that screen readers rely on.
City Hall
Hours
“No next heading.”
The titles only look big. Screen reader users can't jump between them.
H1 City Hall
H2 Hours
“Heading level 2, Hours.”
Real headings. People can skip straight to the part they need.
PDFs screen readers can't read
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PDFs that are only scanned pictures, or that lack the hidden tags and title screen readers need. We check them against PDF/UA , the standard for accessible PDFs.
A scanned page is only a picture. A screen reader finds no words to read.
“Heading, Building permit application.”
A tagged PDF has real words, headings and labeled boxes.
Add-on buttons that promise a quick fix but can't repair the page itself.
The add-on sits on top. The faint words and the unlabeled box are still there.
Pay a parking ticket
Enter the number on your ticket
Ticket number
Fixing the page itself helps everyone, with no add-on needed.
Watch it find the gaps
This is a pretend check of a made-up library page. As the scan passes, each problem is circled and explained in plain words.
Pause motion
riverside-library.example
Hours this week
M T W T F S S
Get a library card
Go
4 gaps found
1 Some links or buttons don't say what they doThe search button is only a picture of a magnifying glass. 2 Some pictures have no descriptionA screen reader says “IMG_0042.jpg, image.” 3 Some text is hard to readPale gray on white is only 2.1 to 1. Normal-size text needs at least 4.5 to 1. 4 Some form boxes have no nameThe card box has nothing a screen reader can read out.
In this example, the check finds 4 gaps.
Some links or buttons don't say what they do. The search button is only a picture of a magnifying glass.
Some pictures have no description. A screen reader says “IMG_0042.jpg, image.”
Some text is hard to read. Pale gray on white is only 2.1 to 1. Normal-size text needs at least 4.5 to 1.
Some form boxes have no name. The card box has nothing a screen reader can read out.
See a page the way they do
Pick a way of using the web. The same library page changes to show what gets in the way.
Pause motion
Plain view
Blurry vision
Color blindness
Screen reader
Keyboard only
Zoomed in
Hours this week
M T W T F S S
Get a library card
Go
Problem
This is the page the way most people see it. Pick another way to use it.
Most of the web still has gaps
95.9% 95.9% of the top million home pages had problems a computer could find 56 56 problems on the average home page in that study 83.9% 83.9% had hard-to-read text, the most common problem
From the WebAIM Million study (opens in a new tab) , February 2026.
The ADA web rule for state and local governments
The first deadline is April 26, 2027.
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That date is for state governments, and for cities, counties and other local governments with 50,000 or more people. Smaller local governments and special districts, such as water, fire or park districts, have until April 26, 2028.
Read the ADA website guide Pause motion
More than one in four adults in the United States have a disability.
Many of them use a keyboard instead of a mouse, zoom in to read, or have a screen reader read the page out loud. Small problems in a website can lock them out.
ADA Gap checks a page the way a careful helper would. Then it tells you what to fix in everyday words, with pictures that show where the problems are. It can't promise a site meets the ADA, and no computer check can find every problem. But it finds many of the gaps an accessibility audit looks for, in web pages and PDFs, so you can fix them first.
Source: CDC disability data (opens in a new tab) , 2022.
Check your site