Enter your site. We follow its links (and its sitemap, if it has one), open up to 100 pages the way iMessage, WhatsApp, Slack and four other apps do, and grade every one, plus the site as a whole. Free, no sign-up.
No site handy? Try the made-up store: getpreviewlab.com/demo/atelier.
From your home page, link by link, up to 3 clicks deep, at most 12 pages per section and 100 in all, plus a sample of your sitemap. We follow robots.txt, open 4 pages at a time, and name ourselves: PreviewLab-Audit.
Title, description, image size and shape, twitter:card, and more, per app. The same checks as “Check a link”.
The worst pages, in phone mock-ups, and the fix: one line in your page template.