Most focus tools are too easy to cheat. When the urge hits, you just toggle the extension off. SPB works deeper. It blocks distractions at the OS level using DNS, process termination, and folder locks. There is no browser trick to get around it. Built for developers, writers, and ADHD brains who need a digital wall that actually holds. It is free, private, and local. No accounts and no data tracking. Just a way to finally finish what you started.