for a while I used Charles as a system-wide proxy, with a "rewrite rule" that directs news.ycombinator.com to a similar page.
related question - are there mac utilities that can do this during configurable hours of the day?
related question - are there mac utilities that can do this during configurable hours of the day?
You don't set hours of the day, but you specify how long you want to "Get Focused". And you can't close the utility via the GUI to keep you honest; it takes a manual SIGTERM to close while in Focus mode.
I've found it very useful, though unfortunately browser support can be flaky. It seems like every major browser release breaks the website tracking and blocking functionality and it takes a few weeks to a few months for the RescueTime utility to catch up. If you don't like using uncommon OS/browser configurations, you'll probably have better luck, though.
I felt guilty writing a script to stop from procrastinating, but it has actually helped tremendously.
My guess is that you could couple that with AppleScript and an iCal alarm to start Concentrate every morning.