Much-needed app, thanks for the same. For some time, I have been thinking about a similar app for the simple requirement of sounding every 25 to 30 minutes while working on a computer just to give rest to the eyes, but I was unable to find a suitable one. The "offline-first PWA with zero dependencies; no build step, no cookies, no links, no analytics, nothing other than timers" gives it a really usable coat for both desktop and mobile