SiteBlocker

SiteBlocker blocks distracting websites on Chrome & Firefox so you can actually get work done. New in 4.1: Locked Mode. Start a focus session you can't quit halfway through (add a partner's email and they're notified if you break early), and Daily Time Budgets. Give any site a per-day limit instead of an all-or-nothing ban. Plus custom blocklists, scheduling, whitelist mode, a Pomodoro focus timer, and cross-device sync. All core blocking is free, forever, with zero data collection.