@double-great/stylelint-a11y
Maintained Stylelint accessibility ruleset for catching inaccessible CSS practices in design systems.
Find the right accessibility testing tool, fast.
121 web accessibility checkers, scanners, browser extensions and PDF tools, sorted by what they test and what they cost. WCAG 2.2, Section 508, EN 301 549.
a11yTools for Safari
Collection of HTML accessibility testing utilities and guidance from Paul J. Adam, including Safari-oriented tooling.
A11yWatch
Website accessibility monitoring product with automated scans and issue tracking for teams.
Abra SDK
SDK that adds accessibility checks into existing Android and iOS UI test suites and reports findings in a dashboard.
accessiBe
Commercial accessibility overlay and auditing products marketed for website compliance programs (evaluate fit carefully).
AccessiBe Free Website Accessibility Checker
Free single-URL scan offered by accessiBe that produces a high-level accessibility findings report.
Accessibility Checker (accessibilitychecker.org)
Free URL-based scanner that reports common automated accessibility findings for a public page.
Accessibility Insights for Web
Open-source browser extension with fast automated checks plus guided assessments for keyboard, tab stops, and manual WCAG tests.
Accessibility Insights for Windows
Open-source Windows app for live inspection and testing of Win32/UWP UI accessibility properties.
Accessibility Scanner (Android)
Official Android app that scans screens for accessibility suggestions such as content labels, touch target size, and contrast.
Accessible Colors
Web helper that suggests accessible color adjustments when a pair fails contrast requirements.
Accessible Name & Description Inspector (ANDI help home)
Official ANDI project home explaining installation and use of the SSA accessibility inspection bookmarklet.
Accessible Web Helper
Browser helper that highlights accessibility issues and connects into Accessible Web's RAMP auditing workflow for deeper remediation.
AChecker
Online checker that evaluates pages against selected guideline sets and supports customizable accessibility checks.
Adobe Color Contrast Analyzer
Web tool in Adobe Color for checking whether chosen color pairs meet WCAG contrast requirements.
alfa
Siteimprove's open-source accessibility rules library and related tooling for developers.
Ally.js
JavaScript library of accessibility helpers for focus management, keyboard interaction, and related UI concerns.
ANDI
Bookmarklet (favelet) that inspects accessible names and descriptions of interactive controls and surfaces practical remediation tips.
APCA Contrast Calculator
APCA contrast resources and calculators for evaluating perceptual contrast beyond classic WCAG 2 contrast ratios.
ARC Platform
TPGi platform for identifying and managing accessibility issues across sites with reporting and workflow features.
ARC Toolkit
Free on-demand page testing extension from TPGi for inspecting accessibility issues directly in Chrome or Firefox.
ARIA DevTools
Extension that presents the page according to ARIA roles so you can see how assistive tech may interpret structure, names, and landmarks.
Asqatasun
Open-source web accessibility engine used for site-wide evaluation against WCAG and RGAA-oriented rule sets.
Assistiv Labs
Browser-based access to real screen readers such as NVDA for remote assistive-technology testing.
AudioEye
Commercial accessibility platform combining automated testing, monitoring, and remediation services for websites.
Axe Accessibility Linter (VS Code)
VS Code extension that flags accessibility issues in HTML/JSX/Vue/Angular templates while you code.
Axe Auditor
Manual-plus-automated auditing workstation from Deque for formal accessibility assessments and reporting.
axe DevTools for Web
Browser extension and DevTools panel that runs axe-core checks on the page you are viewing, with a free tier and paid guided-testing features.
axe DevTools for Web (Firefox)
Firefox add-on edition of axe DevTools for running automated accessibility scans inside the browser.
axe for Android
Deque mobile analyzer for scanning Android apps for accessibility issues, including analyzer workflows that do not require source code access.
axe for iOS
Deque analyzer for scanning iOS apps for accessibility issues from a device or workflow without always needing the app source.
axe Monitor
Deque's enterprise monitoring product for scanning websites at scale and reporting accessibility progress on dashboards.
aXe rule documentation hub
Public rule documentation explaining what each axe check looks for—useful companion when interpreting automated results.
axe-core
Open-source JavaScript accessibility rules engine used by many browser extensions, test runners, and CI integrations.
axe-core npm packages
Official npm wrappers for running axe-core from CLI, React, Playwright, Puppeteer, WebdriverIO, and related stacks.
axe-playwright
Helper library for running axe-core accessibility scans inside Playwright tests.
axe-sarif-converter
Converter that turns axe results into SARIF so accessibility findings can feed GitHub Code Scanning and similar tools.
axesPDF
PDF editing and validation product focused on creating and verifying accessible, tagged PDF documents.
BrowserStack Accessibility Testing
Cloud testing product that combines automated accessibility scans with workflows for broader browser/device coverage.
chai-a11y-axe
Chai plugin for asserting axe accessibility results in web component test suites.
Chrome DevTools Accessibility pane
Built-in Chrome DevTools Accessibility panel for inspecting the accessibility tree, ARIA attributes, and related properties.
CKEditor Accessibility Checker
CKEditor addon that helps content authors find and fix accessibility issues while editing rich text.
Color Contrast Checker (Polypane)
Online contrast checker from the Polypane browser team for validating text and UI color pairs.
Colour Contrast Analyser (CCA)
Open-source Colour Contrast Analyser desktop app for measuring text and UI contrast against WCAG thresholds.
Colour Contrast Analyser portable
Open-source codebase for the Colour Contrast Analyser desktop app maintained by TPGi.
Contrast (macOS)
macOS menu-bar app for quickly sampling on-screen colors and checking WCAG contrast.
Contrast Ratio (Lea Verou)
Minimal online contrast-ratio calculator for two CSS colors with WCAG level indicators.
Cypress Accessibility (Cypress Cloud)
Cypress Accessibility reporting that turns recorded end-to-end runs into accessibility findings for teams using Cypress Cloud.
cypress-axe
Cypress plugin that injects axe-core into end-to-end tests and asserts on accessibility violations.
djLint
HTML template linter and formatter with accessibility-oriented rules for Django, Jinja, Nunjucks, Handlebars, and more.
Editoria11y
Content-focused accessibility checker designed for authors inside Drupal and similar CMS editing experiences.
Equal Access Checker (Firefox)
Firefox add-on for IBM Equal Access automated accessibility scanning of web applications.
EqualWeb
Accessibility compliance platform offering scanning and remediation approaches for websites and apps.
Equidox
Document remediation platform aimed at converting and fixing PDFs and related formats for accessibility compliance.
eslint-plugin-jsx-a11y
ESLint plugin that statically checks JSX for common React accessibility anti-patterns during development.
eslint-plugin-lit-a11y
ESLint plugin for Lit templates that catches accessibility issues in web component markup.
eslint-plugin-vuejs-accessibility
ESLint plugin for Vue templates that catches many accessibility issues before runtime.
Evinced
Commercial accessibility testing platform focused on flow-aware detection for web and mobile product teams.
Firefox Accessibility Inspector
Built-in Firefox DevTools panel for viewing the accessibility tree and checking contrast and keyboard issues.
Foxit PDF Editor Accessibility
PDF editor with accessibility checking and tagging features for remediating documents.
GetWcag
Online accessibility evaluation service that uses axe-core-style automated checks and reporting.
HeadingsMap
Extension that maps heading levels on a page so you can verify document outline structure for screen-reader navigation.
IBM Equal Access Accessibility Checker
Open-source browser extension that uses IBM's rule engine to find accessibility issues and help developers locate them in the page source.
IBM Equal Access checker (npm)
Node module for embedding IBM Equal Access scans into Selenium, Puppeteer, and CI pipelines.
jest-axe
Custom Jest matchers for asserting that rendered HTML has no axe accessibility violations.
Karma accessibility-checker
Karma plugin wrapping IBM accessibility-checker for unit-test-time accessibility scans.
Kayle
Fast open-source accessibility tree walker / engine used in automated website accessibility scanning stacks.
Koa11y
Desktop app wrapper historically used to run accessibility checks on local files and sites via a simple UI.
Landmark Navigation
Keyboard-driven landmark navigator that helps verify ARIA and HTML landmark regions on a page.
Level Access Platform
Enterprise accessibility platform and services for continuous testing, reporting, and program management.
Lighthouse Accessibility Audits
Accessibility category inside Google Lighthouse for automated page audits via Chrome DevTools, CLI, or CI.
Lighthouse CI
CI toolkit for running Lighthouse—including accessibility audits—on every build and tracking scores over time.
Mauve++
Academic system for evaluating website accessibility including dynamic content and connected PDFs.
Microsoft Accessibility Insights Chrome
Chrome Web Store listing for Accessibility Insights for Web.
Monsido
Website governance suite that includes accessibility scanning alongside quality, content, and related checks.
NVDA
Free open-source Windows screen reader widely used for manual accessibility testing of websites and applications.
OnCrawl accessibility
SEO crawler platform that can surface accessibility-related technical findings as part of site analysis.
Pa11y
Command-line tool that loads pages in a headless browser and reports accessibility issues, commonly used in CI.
Pa11y CI
CI-oriented wrapper around Pa11y for testing many URLs from a configuration file in pipelines.
Pa11y Dashboard
Open-source dashboard UI for viewing historical Pa11y results across pages and builds.
PAC (PDF Accessibility Checker)
Free Windows tool for checking many machine-testable PDF/UA and WCAG PDF criteria, with structure and screen-reader style previews.
PageSpeed Insights (a11y portion)
Google's hosted Lighthouse runner; the Accessibility category provides a quick automated score for a public URL.
PDFA / veraPDF
Open-source PDF/A and PDF/UA validator used to check whether PDF files meet archival and accessibility-related standards.
Playwright accessibility assertions
Playwright's built-in accessibility tree snapshot APIs used alongside axe integrations for UI testing.
Playwright axe Core package
Official Deque package for running axe-core accessibility scans inside Playwright tests.
Polypane Accessibility Panel
Accessibility tools built into the Polypane browser for designers and developers, including contrast and issue overview.
Pope Tech
WAVE-powered scanning and reporting platform with a free page allowance and paid team plans for multi-page monitoring.
Puppeteer axe Core package
Official Deque package for running axe-core scans with Puppeteer-driven browsers.
QualWeb
Open-source automated evaluator implementing ACT Rules and WCAG HTML/CSS techniques through a web evaluator and libraries.
React axe Core package
Deque helper that reports axe-core findings during React development renders.
Sa11y
Lightweight checker aimed at content authors that highlights common accessibility problems on a page with plain-language fix tips.
Silktide Accessibility Checker
Browser extension that flags accessibility issues on a page and offers step-by-step guidance and simulation helpers for editors and developers.
Silktide Platform
Website optimization platform with strong accessibility checking, inventory, and reporting for digital teams.
Sitebulb
Desktop site crawler with accessibility insights included among SEO and technical audits.
Siteimprove Accessibility Checker
Free browser extension for checking the current page, including dynamic and password-protected views, with issue highlighting in the browser.
Siteimprove Accessibility Platform
Enterprise platform for crawling sites, tracking accessibility issues over time, and coordinating remediation across teams.
Siteimprove Checker Chrome
Chrome Web Store listing for the Siteimprove Accessibility Checker.
Sitejar free scan
Multi-page scanner that includes accessibility checks along with related quality signals; free guest scans available.
SortSite
Desktop and server site-audit tool that includes accessibility checks alongside broken links and standards issues.
Stark
Design-tool plugin suite for Figma, Sketch, and browsers focused on contrast, vision simulation, and accessibility annotations.
Storybook a11y addon
Storybook addon that runs accessibility checks on component stories inside the Storybook UI.
stylelint-a11y
Stylelint plugin that warns about CSS patterns that often harm accessibility, such as outline removal.
taba11y
Chrome and Firefox extension that visualizes the keyboard tab order so you can spot missing or illogical focus sequences.
Tabnav Web Accessibility Checker
Web-based checker that scans a URL with automated rules and explains findings in plain language.
TalkBack
Built-in Android screen reader used for manual accessibility testing of apps and mobile web content.
Tanaguru
Open-source accessibility assessment tools and services aligned with French RGAA practices.
Tanaguru Contrast-Finder
Open-source web app that finds nearby accessible color alternatives when contrast is too low.
The A11y Machine (TAM)
Node-based crawler that runs accessibility tests across pages and outputs reports for development teams.
TinyMCE a11ychecker
TinyMCE premium plugin that checks content accessibility as authors write in the editor.
Total Validator Online
Online and downloadable checker covering accessibility, HTML/CSS validity, links, and spelling.
UserWay
Widget and auditing products for website accessibility, including automated scans and remediation-oriented features.
Visible
Open-source accessibility testing toolkit oriented around inspecting pages and reporting issues for developers.
VoiceOver (macOS/iOS)
Built-in Apple screen reader used as a primary manual testing tool for Mac, iPhone, and iPad interfaces.
WAVE Evaluation Tool
Browser extension that overlays icons on a page to show accessibility errors, alerts, structure, and contrast so you can review issues in context.
WAVE for Firefox
Firefox edition of WAVE that injects accessibility indicators into the page you are reviewing.
WAVE Online
Web form that runs WAVE on a public URL and shows accessibility indicators without installing an extension.
wcag-contrast (npm)
Small JavaScript library that computes WCAG contrast ratios programmatically for design systems and tests.
WebAIM Contrast Checker
Online form that calculates contrast ratio between foreground and background colors and reports WCAG AA/AAA pass/fail.
WebYes Accessibility Checker
Chrome-oriented accessibility checker that highlights issues on the page and pairs with WebYes site-audit products.
Who Can Use
Contrast explorer that estimates how different vision conditions may experience a given color pair.
wick-a11y
Cypress plugin that logs accessibility violations, can generate HTML reports, and supports audible feedback during tests.