Once is a Chrome extension that limits your visits to distracting websites to once per hour. Instead of blocking sites entirely, Once lets you visit them — but only once an hour, helping you stay productive without going cold turkey.

• Once-per-hour blocking — visit a distracting site, then it's blocked for an hour
• Aggressive mode — visiting any blocked site starts the timer for all blocked sites
• Stats dashboard — track your streak, total blocks, time saved, per-site breakdown, and 30-day trend chart
• Milestones — earn badges at 50, 100, 250, 500, 1K, 5K, and 10K blocks
• Dark mode — automatically follows your system preference
• Blocking overlay — shows stats pills (streak, blocks, time saved) and a link to your full stats

1. Pick the websites that waste your time (Reddit, X, YouTube, etc.)
2. Visit one of those sites and Once starts a one-hour timer
3. If you try to visit the same site again within the hour, Once blocks it and shows you how much time is left

Get Once on the Chrome Web Store

• Node.js >= 18

git clone https://github.com/YoucefHQ/Once.git
cd Once
npm install

npm start

This builds the extension, launches Chrome with it loaded, and opens the options page automatically. esbuild watches for file changes and rebuilds — reload the extension at chrome://extensions to pick up updates.

npm test

Tests use Puppeteer to launch Chrome with the extension loaded and verify the options page, onboarding flow, and site blocking.

npm run build

The build folder will contain the extension ready for the Chrome Web Store.

• React 19
• TypeScript 5
• esbuild
• Chrome Extension Manifest V3

MIT