Free tool
60-Second Focus Leak Test
Click start, then try to work for one minute like you normally would. This page uses your browser's own Page Visibility API to notice every time you switch away to another tab or app and back — no camera, no tracking, nothing sent anywhere. At 0:00 you get an honest count of how many times you left, and a focus integrity score out of 100%.
You just watched your own attention leak in real time, for one minute, using nothing but a countdown and a browser event. Groundkeep's focus sessions cover the minute-to-minute part of the same problem for actual work: start a pomodoro or stopwatch session against a real task, and it logs the seconds you actually worked, tied to that task, whether it's 20 minutes or a whole afternoon. That logged time — not a guess — is what your task's "actual" column shows next to your original estimate, so the gap this test just made you feel becomes a number you can look back on across every task you've ever timed, not just the one you happened to be paying attention to.