16 Web Accessibility Testing Tools & How to Choose One

Not all accessibility testing tools are created equal. Some catch a handful of common accessibility issues, others provide deep, systematic coverage across your entire digital ecosystem. The best tools catch the widest range of barriers — from missing alt text and lower color contrast to inaccessible forms and non-descriptive links — and map every issue directly to a specific Web Content Accessibility Guidelines(opens in a new tab) (WCAG) success criterion. 

Accessibility testing tools (also called web accessibility evaluation tools) are software solutions that scan digital content and applications for barriers that prevent people with disabilities from using them effectively. They test against WCAG and surface violations so developers and designers can fix them before those issues affect users.

According to the WebAIM Million report, 95.9% of home pages have detectable WCAG failures, with low color contrast, missing alt text, and empty links among the most common. These failures are largely detectable, making the choice of testing tool a critical factor in how many of your accessibility issues are actually surfaced.

In fact, independent research shows that detection varies significantly across leading tools, even when scanning identical pages under the same conditions. Bottom line: The tool you choose determines not just how you test, but how much you can actually see. 

Below, we’ll explore 16 accessibility testing tools based on their detection breadth, WCAG coverage, and their top features. 

Top 16 Accessibility Testing Tools

To help you pick the right accessibility testing tool — one that meets your specific needs and business goals — we’ve broken down the top 16 accessibility testing tools into paid and free platforms.

Paid Platforms

AudioEye

AudioEye is a digital accessibility platform that takes a hybrid approach to accessibility testing. We start with a free accessibility scan that identifies common accessibility errors, including missing alt text, lack of video captions, poor color contrast, and lack of support for assistive technologies. AudioEye supplements this testing with Expert Audits performed by a team of experts, as well as individuals from the disability community. The comprehensive approach enables organizations to create digital content that is compliant, accessible, and inclusive — an approach backed by independent research that shows AudioEye outperforms tools by up to 253%.

UsableNet

UsableNet(opens in a new tab) is an accessibility platform that includes a toolkit for testing digital content for WCAG conformance and compliance with accessibility laws, including the Americans with Disabilities Act(opens in a new tab) (ADA). It includes tools for automated and manual testing, accessibility remediation, and reporting and analytics.

Level Access

A unified software platform, Level Access(opens in a new tab) features both expert-managed services and training solutions for sustainable digital accessibility. The platform can be embedded into existing workflows to help digital content creators build more accessible digital content. Additionally, Level Access includes reporting and analytics features for a deeper understanding of how accessible your existing content is.

Silktide

Silktide(opens in a new tab) is a website quality management platform that includes tools for SEO, content, user experience, and accessibility optimization. Its accessibility offerings(opens in a new tab) include solutions for automated accessibility testing, manual audits, training programs, and consultancy services. Together, the tools help you gain visibility into existing accessibility barriers so you can prioritize your efforts to remove them.

UserWay

UserWay(opens in a new tab) is a digital accessibility compliance platform that includes an Accessibility Widget, Accessibility Scanner, and Accessibility Audits. It also includes UserWay for Microsoft Office and PDF. The tools test against WCAG 2.0, 2.1, and 2.2 accessibility standards and see how accessible your content is with WCAG guidelines. The suite of tools helps you create a user experience that is accessible, inclusive, and compliant.

Siteimprove

Siteimprove(opens in a new tab) is a platform comprising digital accessibility and governance, digital experience analytics, performance and search marketing, and cross-channel campaign management tools. The collection of web-based tools is designed to improve website function for all user types, including those with disabilities. Siteimprove’s digital accessibility solution(opens in a new tab) includes automated accessibility testing to measure compliance with accessibility laws such as the ADA and Section 508.

accessiBe

accessiBe(opens in a new tab) is an AI-powered web accessibility solution that includes accessWidget, an accessibility testing solution, and accessFlow, a platform for developers to test, monitor, and remediate accessibility issues. Using these tools and testing processes, organizations can test various user interface components to determine their accessibility and usability for individuals with disabilities.

SortSite Desktop by PowerMapper

SortSite Desktop(opens in a new tab) is a one-click web testing tool. The platform automatically scans your digital content for WCAG 2.X violations and compliance with Section 508 accessibility standards. SortSite can also check for accessibility problems, including broken links, browser compatibility with assistive technologies, spelling errors, and more.

Accessibility Checker by Intopia

Intopia(opens in a new tab) includes a number of tools for auditing and reporting on web accessibility issues. Accessibility Assessments(opens in a new tab), for example, provide organizations with an in-depth analysis of their digital products and identify issues that impact individuals with disabilities. Intopia also helps with accessibility monitoring and pulse checks to enhance accessibility.

Deque

Deque(opens in a new tab) features a number of accessibility tools and apps, including axe DevTools(opens in a new tab). The accessibility testing library includes open-source tools for manual and automated accessibility testing, WCAG audits, and monitoring and reporting tools that provide an accessibility status for organizations. Deque is designed to help organizations create and maintain accessible digital experiences while meeting compliance standards.

TestParty

TestParty(opens in a new tab) is an AI-powered digital accessibility platform that scans websites and source code to detect accessibility issues. The platform identifies issues and delivers fixes directly as source code changes, integrating with developer tools such as IDEs, CI/CD pipelines, and GitHub. It also includes continuous monitoring to track ongoing compliance and incorporates expert testing to review and verify fixes. 

Free Tools

WAVE

WAVE(opens in a new tab) is a collection of accessibility evaluation tools designed to help web developers and authors improve content accessibility by identifying and addressing WCAG errors. Available as a browser extension(opens in a new tab), WAVE allows organizations to perform accessibility testing directly within a web browser. The solution also supports the evaluation of intranet sites, password-protected pages, dynamically generated content, and sensitive web pages. This allows organizations to enhance accessibility across their entire website.

DigitalA11y Color Contrast Validator

DigitalA11y's Color Contrast Checker(opens in a new tab) is a Chrome extension that helps you determine whether your color palettes are accessible to individuals with visual disabilities or impairments (e.g., low vision or color blindness). The tool carefully tests various color combinations against WCAG’s guidelines and suggests alternative color palettes.

Google Lighthouse

Google Lighthouse(opens in a new tab) is an open-source, automated tool that helps improve the quality of web pages. The platform can run on any webpage and provides organizations with scores for overall accessibility, performance, SEO ranking, and more. Scores are displayed in a pass-or-fail format and clearly indicate where WCAG violations may exist. Human testers supplement this testing, identifying more complex accessibility issues such as missing ARIA roles, focus order, and logical tab order.

TPGi’s ARC Platform

TPGi’s ARC Platform(opens in a new tab) is designed to eliminate inconsistent results around accessibility testing. It features simple reporting features, allowing businesses to identify, manage, remediate, and create inclusive, accessible user experiences. The platform tests digital content for compliance with the ADA, Section 508, EN 301 549, and WCAG accessibility standards.

Testsigma

TestSigma(opens in a new tab) is an end-to-end testing platform that enables businesses to run accessibility testing across platforms automatically. Using TestSigma, organizations can write custom accessibility tests without writing any code and run them with ease. The platform provides detailed reports and analytics, helping users understand test results and identify accessibility improvement opportunities.

Gear shaft with the accessibility symbol in the middle over a stylized web browser. Various icons surround the gear shift.

Why Detection Results Vary Across Accessibility Testing Tools

Every accessibility tool returns different results — even when scanning the same page. Understanding why is one of the most important things you can do before choosing a tool for your organization.

Tools Apply Different Rules to the Same Standards

Every automated accessibility tool is built on a rules engine, a set of programmed checks that determine what the tool looks for and how it interprets WCAG success criteria. Two tools can both claim to detect accessibility issues and still flag completely different ones on the same page. That’s because rules engines vary in how many WCAG criteria they test for, how they interpret ambiguous criteria, and how consistently they apply those rules across different content types and WCAG levels.

Fewer Issues Detected Doesn’t Mean Fewer Issues Exist

This is arguably the most important thing to understand about accessibility tools. A tool that returns a low issue count isn’t necessarily scanning a more accessible page — it may simply be running fewer checks. When detection is limited, actual accessibility barriers go unfixed. For organizations managing legal risk or working toward WCAG conformance, that gap has consequences.

Industry research supports this. Most automated tools can reliably detect 25-40% of accessibility issues, meaning even a well-configured automated scan leaves the majority of potential issues unverified — unless expert testing occurs. But within that automation detection range, tool performance varies considerably.

Detection Breadth Determines How Much Risk You Can Actually See

The most meaningful differentiator between tools isn’t the interface or the reporting format. It’s the depth of accessibility issues the tool can actually surface. For example, a tool with narrow rule coverage creates blind spots at precisely the levels that matter most for compliance. WCAG Levels AA and AAA represent the criteria most closely tied to legal risk — and independent research shows these are the levels where detection gaps between tools are most pronounced.

What Independent Research Shows

In January 2026, independent research firm Adience put this to the test. They evaluated five leading automated accessibility tools against the same six websites under identical controlled conditions, measuring how many WCAG success criteria each one detected and how many issues it surfaced across WCAG levels. 

The results confirmed what the sections above describe. Detection varied across tools at every WCAG level. But the gaps widened considerably at AA and AAA, where legal risk tends to be highest. Some tools found nothing at Level AA on multiple sites, even when real issues were there. Others found nothing at Level AAA at all. Arguably the most critical finding: the differences in findings weren’t just about how many issues each tool found — they were about which types of issues each tool was capable of finding.

These findings have a direct implication for buyers: a lower issue count can reflect limited detection capability just as easily as it reflects a more accessible website. Choosing a tool based on surface-level claims of WCAG coverage — without understanding the depth of its ruleset — can leave meaningful accessibility risks unidentified.

For the complete methodology, site-by-site results, and full detection breakdown across all five tools, download the full research report.

An empty form on a landing page, with an accessibility symbol in the lower left corner.

What to Look for in Web Accessibility Testing Tools

The platforms mentioned above are by no means an exhaustive list of accessibility testing tools. There are dozens of solutions available — both paid and free — that can test the accessibility of your digital content. While that can feel overwhelming, there are a few things to look for when evaluating platforms:

• Integration capabilities: Consider how well the accessibility platform can integrate with your existing tools, specifically your development and testing workflows. You don’t want a tool that complicates your CI/CD pipelines, project management tools, or design and development tools, as this can create extra work for teams.

• Automation vs. expert testing: Because automation can’t identify every accessibility issue, look for a platform that includes both automated and manual testing. Doing so can help you find and fix more accessibility issues and improve the user experience.

• Support options: Look for platforms with a team of human experts who can further audit your content for more complex issues or provide guidance on legal matters.

• Accessibility features: Testing platforms should include a myriad of tools, such as a color contrast checker or tools to test for assistive technology or keyboard navigation compatibility. Some tools only focus on specific parts of accessibility, which can limit your site’s overall accessibility.

• Training and resources: Because the digital accessibility industry is constantly changing, look for platforms that offer learning materials for the platform or training courses for digital accessibility as a whole.

Unlock the Benefits of Accessibility Testing with AudioEye

Accessibility isn’t just about legal compliance — it’s about building a digital experience that works for everyone. With 1.3 billion people worldwide living with a disability, the organizations that prioritize accessibility aren’t just reducing legal risk. They’re reaching a wider audience, improving usability for all users, and demonstrating a genuine commitment to inclusion.

The right tool makes it all possible. AudioEye takes a hybrid approach to accessibility testing, using powerful automation to detect common issues while our team of human experts tests your content for more complex barriers. The result is digital content that’s not only compliant but genuinely accessible to the people who need it most.