About OneTool

OneTool is operated by Apala LLC. It is a growing collection of free calculators and utilities that run entirely in your browser. No accounts, no uploads of tool input to our servers for processing, and no paywall in front of the catalog.

The mission is practical: give people fast, private tools for everyday developer, writing, design, finance, math, and health-estimate tasks, with enough explanation on each page that you can use a tool whether you arrived from a bookmark or from search.

We prefer client-side logic and static hosting. When a tool needs external reference data (for example currency rates), we bake that data into the site at build time and cite the source — rather than pretending live bank rates or inventing numbers.

The catalog expands over time. If something is wrong, unclear, or missing, use the contact page. Legal pages for privacy, terms, and third-party credits are linked in the footer on every page.