Cost of living data is published across multiple federal and academic sources: the Bureau of Economic Analysis publishes Regional Price Parities, the BLS publishes Consumer Price Index by region, the Census Bureau publishes the American Community Survey, MIT publishes the Living Wage Calculator, USDA publishes the Food Plans cost-of-food estimates, KFF publishes state health spending and the EIA publishes state energy profiles. The C2ER Cost of Living Index is the most-cited commercial dataset but it does not include taxes and its underlying methodology is paywalled.
No single publication consolidates these sources with equal depth across all 50 states. The commercial cost-of-living rankings tend to be listicle-driven; the government statistical releases are rigorous but rarely compared side-by-side. This site sits in the gap: one page per category, all 50 states on every page, primary federal sources cited inline.
The site is run by Digital Signet, an independent research collection that also publishes per-state tax references and other US consumer-cost surfaces. See the sister references below.