ChemWhat is a chemical and biological database company focused on making information about substances and related products easier to find. Its website presents searchable listings for chemicals by CAS Registry Number and enzymes by EC number, alongside browsing by product category. These categories span advanced chemicals, analytical chemistry, antibodies, biochemical engineering, catalysts and auxiliaries, chemical pesticides, reagents, dyes and pigments, enzymes, flavors and fragrances, and food additives.

The catalog also includes immunodiagnostic products, impurity reference standards, inorganic chemicals, OLED materials and intermediates, organic building blocks, peptides, pharmaceutical intermediates, polyethylene glycol, and recombinant proteins. In addition to its database and product listings, ChemWhat offers global sourcing and custom services, and provides news and information about its work. The site also features a list of untrusted entities, indicating a resource for users navigating chemical and biological information and sourcing.

ChemWhat is based in London, United Kingdom. Its stated emphasis is precision, completeness, and efficiency in chemical and biological data