Seraphim Insights
Seraphim Insights is the internal analytics tool of the agency that operates this tool. With a channel owner's permission it reads their YouTube channel's videos and analytics, and shows which videos lead to link clicks, sign-ups and sales, so the agency can report on and improve the work it does for that client.
There is no public sign-up. Channel owners receive a one-time connection link from the agency, approve read-only access on Google's own screen (and, if they choose, TikTok's, Instagram's or Facebook's), and can remove that access at any time. Nothing on their channel is changed unless they separately allow description edits.