GymLog.

GymLog is a personal workout companion built to run natively on mobile, installed from the browser to the home screen. Training sessions are organized by day — Monday through Sunday — with exercise cards that track multiple sets per exercise. Each set row captures reps and weight; tapping the check button marks it green and fades the inputs. A summary counter shows completed sets at a glance.

Each exercise card also has a built-in rest timer button. Tapping it opens a circular countdown panel — default 90 seconds, adjustable in 15-second steps. When the timer completes, the circle turns green and the device vibrates. A compact mini bar at the bottom of the screen persists while the timer runs, so you can log the next exercise without losing track of the rest.

Most gym apps require an account, a subscription, or constant network access. GymLog runs entirely on localStorage — no server, no login, no sync. Opening it is as fast as any native app because it ships as a PWA with a Service Worker that caches all assets after the first load.

The design constraint was simplicity. A gym floor is a hostile UX environment: sweaty hands, no time, short attention spans. Every interaction had to be reachable in one tap. The large input fields, the green flash on set completion, the persistent mini timer bar — all exist to reduce cognitive load while lifting.