Calendar Checkoff

I keep my week in Google Calendar. I block time for each task, and the calendar becomes a to-do list.

When a block was finished, I turned the event gray. That gave me a clear “done” marker, but it erased the colors I used to group my time. My upcoming week kept its categories; looking back, everything was the same gray.

I wanted to mark an event done and keep its color. A checkmark in the title did both.

One gesture

Editing every title by hand would have been its own chore, so I wanted to hold a key and click.

Calendar Checkoff works inside Google Calendar. Hold Option on a Mac, or Alt on Windows and ChromeOS, and click an event you can edit. The extension adds a ✅ to the start of the title, and the same gesture removes it. The event keeps its color, and Calendar saves the change just as if you had edited it yourself.

Small on purpose

I kept the extension narrow. There is no account, no popup, no separate task list, and no analytics. It asks for local storage and permission to run on the Calendar page, and nothing else.

I also chose not to build on the Google Calendar API. The page structure it leans on rarely changes, so for a tool this small the simple approach was the right trade.

Taking it all the way

I built Calendar Checkoff for myself first. I published it because it let me carry one small problem through the whole process: find the job, build the solution, then set up distribution and observability around it.

The Chrome Web Store hosts the extension, Cloudflare serves and measures the website, and the code lives on GitHub.