[bfioca]

If you read the post it mentions that apps like self control are imperfect because you have to keep telling it which sites to block. RescueTime has a huge part of the internet already categorized and scored as distracting or not and lets you tune those settings in broad strokes - so if you go to a site you've never even heard of, if it's a distracting site you'll be blocked without having to have entered it.