Web application
Focus timer
A focus timer that stays accurate in background tabs, records what each session was spent on, and works offline.
01 Problem
Browser timers drift when a tab sleeps; a timer you rely on must not.
02 Approach
- Remaining time is derived from timestamps rather than counted ticks.
- Built without a framework, using Web Components.
- A hand-written service worker makes it installable and offline.
03 Evidence
- Timer and history tests with fake clocks
- Browser test that fast-forwards a full session
The repository README explains how to run each test suite, and its continuous integration history is public.