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SCANFIXPROVE

RedFlag is an accessibility checker for agencies, small teams and anyone who has to actually fix things. Scan any page for WCAG 2.1 and 2.2 issues, get the exact element, then work each one through to a fix you can prove landed.

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( Why RedFlag )

What does an accessibility checker actually catch?

An automated accessibility checker finds what can be detected in code: missing alt text, low colour contrast, unlabelled fields, empty buttons, broken heading order. It cannot judge whether your alt text is meaningful or whether a screen reader user could finish a task. Deque, who build the engine RedFlag runs on, put a number on it: axe-core finds on average 57% of WCAG issues automatically. The other 43% needs a person. RedFlag runs on that same axe-core engine, but wraps it in a workflow people actually use. Each scan maps violations to WCAG success criteria, tags a severity, points at the exact selector, and explains the fix in plain English. Fix it once and it stays fixed, nobody has to rediscover the same fifteen issues next audit. Scan from the extension, check on things from the dashboard, and when a client asks for proof, you've already got it.

60.3%

of the accessibility issues we found belonged to a pattern that repeated across pages.

4,135 pages · 92 websites · August 2026

Read the research →

Every violation mapped to a WCAG criterion

( What it does )

Four ways RedFlag plugs into your workflow.

01

Page scans in your browser

The Chrome extension runs axe-core locally on the active page. When you are signed in, results sync to your dashboard with severity, selector, HTML snippet, and fix guidance for each violation.

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Chrome extension • axe-core • WCAG 2.1 & 2.2

02

Full-site crawls

Pro reads your sitemap.xml and works through up to 100 pages in one run. Everything lands in a single domain view: one score, one issue list.

Sitemap crawl • 100 pages • Pro

03

Issue tracking & scoring

Work the queue: open, in progress, ready to verify, confirmed fixed. A weighted accessibility score per domain moves with every scan and every confirmed fix, and a recheck confirms the fix actually landed.

Workflow • Weighted score • Recheck

04

VPAT export & CSV

Export VPAT/ACR conformance snapshots and CSV issue lists from your live dashboard data for stakeholders and procurement.

VPAT / ACR • CSV

Localaxe-core scans run
in your browser
100Pages per full-site
crawl on Pro
47WCAG criteria
checked & covered
$15Per month for Pro.
Free for 1 domain.

( How it works )

From first scan to verified fix.

No six-week audit engagements. Scans run in your browser, results land in your dashboard, and the score updates the moment a fix is verified.

  1. / 01

    Install

    Add the RedFlag Chrome extension and connect it to your dashboard. Free, no card.

  2. / 02

    Scan

    One click on any page, or a sitemap crawl across the whole site on Pro. Every violation arrives with a WCAG criterion, severity and selector.

  3. / 03

    Fix & verify

    Work each issue through the queue, open, in progress, ready to verify, then recheck the exact element to confirm the fix actually landed.

  4. / 04

    Report

    Export a VPAT/ACR conformance snapshot or CSV from live dashboard data for stakeholders and procurement.

( Why it matters )

Accessibility is a process, not a checkbox.

A score that means something

Critical issues cost more than minor ones. The weighted score reflects real user impact, not a raw issue count.

Evidence, not opinions

Every issue carries its WCAG criterion, the exact element, and the fix. Accessibility conformance reports are generated from that same data.

Honest about coverage

Automated rules catch roughly 57% of WCAG issues, on Deque’s own numbers for axe-core. We say so plainly, and recommend manual review for the rest.

( From the blog )

Latest articles

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( Questions )

Before you install.

Is there a free accessibility checker?

Yes. RedFlag is free for one domain with no card required, including unlimited single page scans. You get the full scan engine, not a teaser.

Which WCAG version does it check?

WCAG 2.1 and 2.2 at Level AA. RedFlag documents 122 rules covering 47 success criteria, 96 checked automatically and 26 flagged for manual review.

Who is RedFlag for?

Anyone responsible for a website that needs checking: agencies running client sites, small teams without an accessibility specialist, and developers who want the selector rather than the paragraph. Larger organisations use it too, it just is not designed around them.

What does it cost?

Free covers one domain and unlimited single page scans. Pro is $15 USD per month and adds unlimited domains, full-site crawls up to 100 pages, full history, and VPAT/ACR and CSV export.

What are the limits?

RedFlag is Chrome and Chromium only, and it checks web pages rather than PDFs. It is not an audit and does not certify any standard: automated results are a starting point, and a formal conformance assessment needs a human expert as well as a tool.