Know what broke on your website's accessibility this week.
AccessDiff scans your sites every week with automated checks against WCAG 2.2 AA, shows you exactly what changed since last week, and sends a report you can forward to whoever owns the fix.
Get early access
Be first in. Leave your email and we’ll send your invite.
Scans weekly, automatically.
Up to 25 pages per site, found through your sitemap and links, with a polite crawler that respects robots.txt.
Shows the diff.
Every report leads with what is new and what was fixed since the last scan, so a regression from Tuesday's deploy is at the top on Monday.
Explains the fix.
Each issue comes with where it is on the page (selector and element) and how to fix it, straight from the axe-core rule documentation.
Plans
All plans: weekly scans, 25 pages per site, what-changed diff, PDF + HTML report, email summary, score history, forwardable reports with your logo on them.
Starter
For a business with a site or two.
$49/month
Up to 5 sites · $490/year
Get early access: StarterAgency
For agencies managing many client sites.
$149/month
Unlimited sites (fair use) · $1,490/year
Get early access: AgencyAnnual plans: pay for ten months, scan for twelve. Cancel any time. No per-page or per-report fees.
Fair use: unlimited means every site you manage for clients, at 25 pages each. We will talk to you before anything changes if usage is far outside what a single agency does.
Reports carry your brand: name, logo and colour, ready to forward to a client or a developer.
We never log in to your site and keep no personal data: we store page URLs, element snippets and issue lists, nothing about your visitors.
Our crawler identifies itself (AccessDiffBot/1.0), follows robots.txt and loads two pages at a time.
For people
Sign in with a magic link, add a site, read the weekly report. The dashboard shows every site with its score, what changed this week and when the next scan runs. Refunds within 14 days, no questions asked.
For agents
Agents get the same scan as one POST, described by an OpenAPI 3.1 document, plus an MCP server with two tools: scan and quick-scan. Scans count against the account's allowance; past it, agents pay $2.00 per site scan.
Questions
›What does AccessDiff check?
Automated checks against WCAG 2.2 level A and AA, using the axe-core rule set, plus a few labelled best-practice checks such as heading order. Each issue in a report names the rule, the WCAG success criterion, the element on the page and how to fix it.
›Does AccessDiff tell me whether my site meets legal requirements?
No. AccessDiff finds and tracks the issues that automated checks can find and tells you how to fix them. Automated checks find a portion of accessibility issues; a review by a person is needed to find the rest, and AccessDiff does not assess legal obligations. Treat the report as a to-do list, not as an assessment.
›A report says zero issues. Is my site accessible?
It means the automated checks found nothing on the pages scanned. Many accessibility problems (keyboard traps, confusing link text, video captions, meaningful alt text) need a person to judge. A clean report is a good sign, not a finish line.
›How many pages are scanned?
Up to 25 per site per scan: the homepage first, then pages from your sitemap with the shallowest paths first, then pages we find by following links on the same site. Assets (PDFs, images), pages blocked by robots.txt and pages behind a login are skipped. Larger budgets are available on request.
›How does the weekly diff work?
Each issue gets a stable identity from its rule, its place on the page and the element itself. Next week we compare: issues that disappeared are "fixed", issues we have not seen before are "new", and the rest are "unchanged". If a page could not be scanned this week, its previous issues are neither fixed nor unchanged; the report says so.
›What is the score?
A 0 to 100 health score for the site, averaged over the pages we scanned. Each page starts at 100 and loses points per failing rule by impact (critical 10, serious 5, moderate 2, minor 1), with a smaller penalty for each additional element failing the same rule, capped per rule. The formula is printed at the bottom of every report. Use it to watch the trend, not as a pass mark.
›What do critical, serious, moderate and minor mean?
They are the impact levels from the axe-core rule set, describing how much an issue is likely to affect people using assistive technology. Critical issues (a form field with no label, an image with no text alternative) block people; minor ones are rough edges.
›Can I scan a site that is not mine?
You can scan any public site your account is allowed to add. Our crawler follows the site's robots.txt and loads two pages at a time with pauses, so it behaves like a careful visitor. If a site's robots.txt disallows us, the report will say the site could not be scanned.