unfurl

See what X and Slack will show, before you post the link.

Page URL

Try

Each card is built from the HTML that platform's own crawler receives — Twitterbot/1.0 for X and Slackbot-LinkExpanding for Slack — plus a browser fetch to compare against. Sites that answer bots differently show up as a dot on the user-agent switcher.

The previews approximate current rendering on each platform. Both change their layouts without notice, and neither documents its fallback order exactly; anything inferred is labelled as an assumption rather than stated as fact.