Submitted URLs are processed transiently to resolve the public media you request. They are not saved in browser storage and are excluded from product analytics.
Product analytics contain only the selected tool, a fixed action, a fixed outcome code, and a broad latency bucket. They do not contain source URLs, titles, authors, publication names, filenames, media IDs, or signed media sources.
Google Analytics measures aggregate tool activity using those fixed fields. Submitted URLs and media details are not included.
The service does not request Substack credentials and is limited to content available to an unauthenticated visitor.