Auto-Block Focus Time in Google Calendar — Building a Schedule-Based Chrome Extension (opens in new tab)

Most focus-time tools for Google Calendar require OAuth access and sync your calendar data to their servers. Clockwise shut down its free tier. Reclaim is expensive. I wanted something simpler: define quiet hours locally, and have the extension visually block those times on my calendar — no cloud, no account, no data leaving my browser. That's Quiethours. Here's how it works technically. Architecture: Pure DOM Overlay Quiethours doesn't call the Google Calendar API. It injects a content scrip...