Lean
A dependency-free, offline-first fat-loss tracking PWA I built for my girlfriend and myself. One HTML file, no framework, no build step, no subscription.
Vanilla JS · Service Workers · GitHub Pages · localStorage
Problem
Every fat-loss tracker I tried was bloated with features I never used, hidden behind a subscription, or slow to open at the gym. I wanted something that loads instantly, works without signal, and asks nothing in return.
Approach
I built Lean as a single vanilla HTML/CSS/JS file with zero dependencies. A service worker makes it offline-first so it works on flaky gym wifi. Two profiles, mine and my girlfriend's, are distinguished by accent color. It carries real recipe data, logs futsal as a minutes-based activity, runs a daily checklist and fires multiple reminder notifications.
Stack
Screens
Outcome
Lean is deployed on GitHub Pages with data stored per device in localStorage, so there are no accounts and no backend to maintain. It is in daily use by both of us.