Check a page's Open Graph link preview as crawlers see it
Paste a URL and see the preview in iMessage, Discord, X, Slack, LinkedIn and more. It fetches the page like the crawlers do, probes the og:image and og:video files, and tells you which apps will play the video. Free and open source.
Pace needs two or more snapshots. This launch has 1, so velocity and momentum read as unmeasured rather than zero.
A source that found nothing is a measurement. A source that has not run is a gap. Neither means the launch lacks the thing.