Chrome extension
Install extension on your browser and track time while on the go.
What is Clockbook
Clockbook is a web-based time tracker and Mac-compatible time tracking software. It’s the only time tracking program that’s truly free, no matter how many projects you have or how big your team is.
Clockbook is primarily a browser app, but you can also install it on your Mac OS X as a native desktop app to make time tracking more convenient.
You can track how many hours you spend working on tasks from the Mac application, and then run reports, manage projects, and review timesheets in the browser version.