I'm going on a no fap holiday and I was wondering if there's an app that can block websites I choose to block, any suggestions?
If really want to not fap, go by not blocking any websites. You will fail and that is guaranteed. Build your will power to not go watching for porn. Again, you will fail for sure but you can only gradually improve in this and not by the snap.
I literally stopped Porn a year back without wven blocking any websites. You are always a few clicks away from a porn site but you must have the built up will power to not go into that.