The blocking feature is only available on iOS devices at this time and Smart Filter is available in Onward Pro, not Onward Basic. You can now customize your access times down to the day and hour every day of the week with version 2.7.1. Remember, you can also snooze Smart Filter by tapping settings gear in the upper left of the app at any time and it will unblock for 5 or 15 minutes, depending on your track.
Our categories and app/website lists are too exhaustive to list in this article. You will see both specific and general categories when you are selecting websites, apps and categories in the app itself.
If you experience a website or app that is not blocked that you'd like to be blocked, just shoot as a note via Help in the app or firstname.lastname@example.org and we'll see if we can add it.