Compendium28 is a free web archive maintained as a structured reference collection. It catalogues operating websites across 22 subject sections — from Capital & Exchanges and Medicine & Therapeutics to Voyages & Itineraries and Miscellany & Sundries. The archive was established as a reference resource rather than a promotional platform. Each entry is recorded by domain and subject, with a description sufficient for initial identification. Inclusion reflects the existence and nature of a site, not a commercial arrangement or quality ranking. Submissions are open at no cost. Once received, a submission is reviewed before the record is added to the relevant section. The process focuses on accurate classification and completeness of the basic record rather than detailed curation. Compendium28 currently holds 834 entries across all sections. The archive is updated as new submissions are approved. Readers are encouraged to submit sites in sectors where the current filing is sparse — every section benefits from a wider record.