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Why these tools matter

About 1.3 billion people worldwide — roughly 16% of the global population, or 1 in 6 — experience significant disability, per the World Health Organization fact sheet (last updated 7 March 2023). The World Wide Web Consortium's Web Accessibility Initiative (WAI) was founded in 1997 specifically to ensure the web works for those users; the Web Content Accessibility Guidelines (WCAG) it publishes have been the standard reference since WCAG 1.0 (5 May 1999). The current published version is WCAG 2.2, which became a W3C Recommendation on 5 October 2023.

The tools in this category target the practical questions a builder faces when applying WCAG to a real product: does the colour pair pass the 4.5:1 ratio for body text and 3:1 for large text? Does the heading hierarchy actually convey structure to a screen reader? How will the layout look to a user with deuteranopia or tritanopia? Will the prose meet a target reading-grade level? Each tool runs in your browser, so the content you check never leaves your device — useful when you're auditing pre-release copy or unannounced products.

The legal context

Web accessibility lawsuits in the United States are filed almost entirely under ADA Title III ("public accommodations"). Two cases shaped the modern landscape: National Federation of the Blind v. Target Corp. (filed February 2006, settled August 2008 for $6 million) and Robles v. Domino's Pizza, LLC (Ninth Circuit ruling 15 January 2019, Supreme Court declined to hear Domino's appeal on 7 October 2019). The result has been a sustained boom in filings: 4,187 federal digital-accessibility lawsuits in 2024, with more than 4,000 each year since 2021. Notably, more than 1,000 of the 2024 defendants had already installed an "accessibility widget" — the overlay-style scripts heavily marketed to small businesses — which did not prevent the suit. Catching the issues at build time, with the kind of tooling on this page, is materially cheaper than discovering them in litigation.

In April 2024, the US Department of Justice finalised an ADA Title II rule applying WCAG 2.1 Level AA to state and local government web content and mobile apps. In April 2026 the DOJ extended the original deadlines by one year via Interim Final Rule, so large public entities now have until 26 April 2027 and small entities until 26 April 2028. In the EU, the European Accessibility Act (Directive 2019/882) began applying on 28 June 2025, with the harmonised technical standard EN 301 549 v3.2.1 incorporating WCAG 2.1.

A short tour of what the tools do

• WCAG Heading Checker — validates that <h1>–<h6> form a single rooted tree without skipped levels, the most common WCAG 1.3.1 failure on real sites.
• Screen Reader Preview — shows what a screen reader's accessible name and description would announce for each element on a page, useful before you test on the real assistive tech (NVDA, JAWS, VoiceOver, TalkBack).
• Color Contrast Checker — computes the WCAG luminance ratio for any two colours and tells you which thresholds it passes (AA normal text 4.5:1, AA large text 3:1, AAA normal 7:1, AAA large 4.5:1, plus the 1.4.11 non-text-contrast 3:1 minimum from WCAG 2.1).
• Accessible Palette — generates a palette where every text/background combination already passes the AA ratio, so you don't have to reverse-engineer compliance after the fact.
• Color Blindness Checker — simulates protanopia, deuteranopia, tritanopia and achromatopsia so you can see whether a colour-coded UI conveys the same information without colour.
• Dyslexia Formatter — applies the layout adjustments (font choice, line spacing, paragraph spacing) that dyslexia advocacy organisations recommend for long-form reading material.
• Readability Scorer — runs Flesch Reading Ease (1948), Flesch-Kincaid Grade Level (1975), SMOG (1969), and Gunning Fog (1952) against pasted text. Useful for matching content to an audience reading level.
• Large Print Viewer — reflows pasted content into a high-contrast, large-type single-column display.
• Accessibility Resources — a curated directory of the major standards, testing tools, screen readers and learning materials; effectively the "where do I start" page for someone new to the field.
• Visual Schedule, Picture Board, Memory Card Game — augmentative and alternative communication (AAC) and cognitive-support patterns commonly recommended by occupational therapists.
• Reading Time Estimator — uses the standard 200-words-per-minute reading-rate (conservative relative to Brysbaert's 2019 meta-analysis of 190 studies, which converged on 238 wpm for non-fiction) to set expectations on long content.

A note on automated tools

None of the automated checks on this page — and none of the better-known commercial tools either (axe DevTools, WAVE, Lighthouse, Pa11y) — catch all WCAG conformance issues. Deque, the company behind axe-core, frames its platform as catching "up to 80% of issues"; most independent estimates put the realistic range at 30–50% of total WCAG conformance. Manual testing with a real screen reader on a real device remains required for any serious accessibility claim. Use these tools to catch the easy 30–50% quickly, freeing manual testing budget for the harder issues.

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