This looks great, except I have a lot of linux devices, which doesn't look supported. Currently I'm often avoiding my app/website blockers by switching devices or browsers.
Part of this is not having something else to do in place of doing the old habit. Part of this is not getting a reward for doing the something else. Maybe make a list of things you (used to) enjoy and keep it somewhere visible, revisit it frequently, especially when you are about to hit a cue that sends you into an activity you want to avoid.