One engine.
Two ways to run it.

If your store runs on Shopify, the Shopify app is the shorter path: it installs from the App Store, bills on your Shopify invoice, and knows it is looking at a storefront. For anything else — WordPress, Webflow, Next.js, a static site, or several sites at once — use the Site Scanner and paste the URL. Both run the same WCAG 2.2 AA engine and produce the same scored report.

A real scan, your score, and your top issues on screen — no card and no trial clock. The paid tiers add full issue-level detail, PDF and Excel exports, an ACR/VPAT compliance report, more pages and sites, and scheduled monitoring with regression alerts.

Yes. Shopify app charges appear on your normal Shopify invoice and you can cancel from inside the app. The Site Scanner bills by card through Stripe instead.

Yes, from your account. Paid features run to the end of the period you already paid for, then the account moves to the free tier and keeps its scan history and past reports.

No, and nothing sold here claims to. A scan tells you where the code stands against WCAG 2.2 and hands you a dated, scored report with what to change. Automated testing reaches most issues by volume but only part of the standard — screen-reader behaviour, focus order, whether alt text actually means anything need a person. The report says which parts were machine-tested and which were not.