TariffCatalog helps businesses understand what U.S. tariffs apply to their goods. You can look up how a product is treated today or at an earlier date, follow tariff changes over time and review customs bills to check the numbers.
It also lets you compare different countries of origin, prepare customs paperwork and watch how tariff changes affect a whole product catalogue. The site is clear that its results are estimates to be verified before filing, so it works best as a planning and research aid.