About UnitBook

UnitBook is a single, focused tool: a fast unit converter with a set of everyday calculators built in. Pick a category, type a value, and get an accurate answer instantly — no clutter, no waiting.

Every calculation runs entirely in your browser. There are no accounts, no ads following you around, and no analytics that sell your behaviour. The numbers you type never leave your device, and the tool keeps working offline once the page has loaded.

It is built and maintained by Interhive OÜ, a small studio in Tallinn that makes tiny, dependable web tools.