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I've used NextDNS.io in the past and setup schedules to block the reddit domain during work hours.

The problem that I found is that sometimes it's not just a place of procrastination but the place you want to search for a useful answer to your question.

I could live with not being able to access reddit from my private phone, I am not logged into my personal reddit account on my work PC.

Some apps like ScreenZen allow you to block websites, if you're on Android. Pretty much any iOS app will let you restrict websites (because it's easier to implement there).

Leechblock for Firefox works well, but sadly doesn't work on iOS.