Developer builds privacy-first screen-time calculator that runs entirely in the browser

A developer has created a screen-time calculator widget designed to operate with no backend calls, tracking scripts, cookies, or external data collection. Users input their daily phone usage, the share of time they want back, and their age, and the tool returns results measured in waking years of life rather than raw hours. The widget is distributed as a plain iframe pointing to a static page, meaning host sites never grant it DOM access or expose visitor data. To avoid a common usability flaw, the embed dynamically reports its height to the parent page so it renders correctly on mobile without clipping its attribution link. The developer also ensured shared results preserve the original inputs via URL parameters, so recipients see the same numbers that prompted the share.