Is there a "noprocrast" mode for everything?

Question

On Hacker News, there is a feature that keeps you from spending too much time on the site.  Anything general purpose (Medium, PH, Twitter, FB) out there?

Mike Coutermarsh · Accepted Answer

Check out the RescueTime Chrome extension. You can limit how much time you spend on certain types of sites.

Sebastian Tory-Pratt · Answer

You can add sites to a redlist and set a total time limit for sites on the list. Its simple to use and free.

Ivan Mir · Answer

Focus is the most customizable Mac app for this and it works for all browsers.

Susanne Anders · Answer

Works on Mac, Win, Android. With the free version you can block list(s) of websites you pre-defined. Pro version (one time fee) adds the possibility to block apps, scheduling, and some other options.