Detection is a ruleset. Zero AI cost, so it's unlimited and free. The one-time fee is for the part that actually costs money: fix suggestions.
Re-scans are free and unlimited on every tier. Check your score again anytime after you edit a page. The one-time unlock covers everything flagged today; if a rescan turns up new content, unlock it again or add the optional $9.99/mo retainer so new content is covered automatically from then on.
Re-scanning is free and unlimited on every tier, always. The one-time $20 unlocks fixes for everything flagged today. If you publish regularly, the optional $9.99/mo retainer covers newly-flagged content automatically after every re-scan, so you're never paying twice for the same kind of check-in. Most sites don't need that, so it stays optional.
The read a careful editor would give your site, run in twenty seconds. Built by Rally Digital.