Most Open Graph checkers need a crawler to fetch your page, so they can't see localhost. OpenGraph+ for Mac can. Point it at localhost, staging, or any website and see the link card 22 platforms will show. Inspect the tags and copy what's missing. Free. No account.

OpenGraph+ automatically generates clean, up to date Open Graph images for every page on your site. Links are shared more in Slack, iMessage, Discord, Teams, and group chats than on social feeds, but most sites still ship broken or generic previews. Fixing this usually means manual images or custom renderers that fall out of sync. OpenGraph+ captures your pages, renders social cards, and keeps them updated as content changes without running a renderer in your app or designing images by hand.