Catsup.io is a niche editorial site billed as the internet's most comprehensive resource dedicated to the history, science, culture, and future of catsup — the older American spelling of ketchup. It traces the condiment's journey from fermented fish pastes in 17th-century Southeast Asia to the tomato-based staple now found on an estimated 97% of American tables, while diving into the catsup-versus-ketchup spelling debate, regional taste differences, and the question of who actually invented it. The site is structured around five... read full review »