Site Blocker — Block Websites, Pomodoro Timer, Privacy & Focus

Block websites, run Pomodoro, schedule focus. Zero telemetry, unlimited blocklist. Private BlockSite alternative.

A privacy-first site blocker for Chrome. Block distracting websites, schedule focus sessions, and run Pomodoro sprints — without anyone watching what you browse. ⸻ Why this extension exists ⸻ In February 2026, security researchers disclosed that a popular site blocker with 5+ million users was silently exporting the URL of every page its users visited. The same tool people installed to protect their attention was logging where their attention went. This is the clean replacement. Blocking is enforced by Chrome through the declarativeNetRequest API. No telemetry. No analytics. No URL logging. No outbound network requests — nothing about your browsing ever leaves your device. ⸻ What it does ⸻ • Block any website by domain, URL, or keyword • Eight prebuilt categories: social media, video & streaming, news, shopping, gaming, messaging, AI chat, and adult sites • Schedules — block sites during work hours, study windows, weekends, or any recurring time • Focus mode — 25 / 50 / 90-minute Pomodoro sprints with a one-tap +10 min extender • PIN lockdown + strict mode — your future self can't undo the rules in a weak moment • Custom block page with an optional "Allow for 5 minutes" escape hatch • Right-click "Block this site" from any page or link • Light / Dark / Auto theme, compact and comfortable popup densities • Local-only storage — your rules never leave your device, no account or cloud • Import / Export JSON, including one-click BlockSite list imports • Incognito support (split mode), keyboard-driven command palette • Unlimited blocklist — no caps, no tiers, no upsells ⸻ Built for ⸻ People who left a previous site blocker after the February 2026 incident. Students preparing for exams. Remote workers in deep-work mode. Researchers, writers, and developers running focus blocks. Parents managing kids' Chromebooks. Pomodoro users tired of paying a monthly fee for a timer. ⸻ How blocking works under the hood ⸻ Add a domain or keyword. The extension registers a declarative rule with Chrome, and Chrome enforces it — redirecting the blocked request to a friendly block page before the site loads. The extension never reads page content and never makes an outbound network request, so nothing about your browsing is collected, logged, or transmitted. ⸻ Why this site blocker over the others ⸻ ✓ Zero telemetry, zero analytics, zero URL logging ✓ No outbound network requests — nothing about your browsing ever leaves your device ✓ Declarative blocking via the Chrome API — rules are enforced by Chrome, not by monitoring your traffic ✓ Unlimited blocklist (vs the 3-site cap most others impose on free) ✓ Manifest V3 native — built for Chrome's current and future extension model ✓ No account, no email, no signup, no cloud ✓ Focus Timer, keyword blocking, schedules — all included, no Pro tier ✓ No paywall, no monthly fee, no upsell ✓ PIN + strict mode — a real commitment device ✓ One-click BlockSite import — bring your blocklist with you ⸻ Migrating from BlockSite ⸻ 1. Export your BlockSite list (Settings → Export) 2. Open the extension → Import / Export → Choose file 3. Done — your blocked domains land in your new blocklist ⸻ Looking for an alternative to… ⸻ BlockSite, StayFocusd, LeechBlock, Cold Turkey, Freedom, Forest, Marinara, Strict Workflow — this is the privacy-first, MV3-native website blocker that doesn't watch what you browse and doesn't charge a monthly fee. ⸻ Common use cases ⸻ • Block individual social, video, and entertainment sites • Block AI chat tools during deep-work blocks • Block news sites during focus hours • Block shopping sites during a no-spend month • Block gaming during exam season • Pomodoro timer with a built-in site blocker (no separate app) • Study mode for students • Work hours blocker for remote workers • Parental site blocking on a Chromebook • Distraction-free browsing as a daily habit • Anti-procrastination tool with real commitment ⸻ Privacy & permissions ⸻ • declarativeNetRequest — apply your block rules. Chrome enforces them; the extension makes no outbound requests. • storage — save your rules and settings locally on this device. • alarms — focus-session timer and schedule transitions. • tabs — show the block page, re-check already-open tabs when a block starts, and restore tabs when it ends. • activeTab — the "Block this site" action from popup or right-click. • contextMenus — right-click menu items. • notifications — alert you when a focus session ends. • host access (all sites) — required by Chrome to redirect a blocked page to the custom block screen. Used only for blocking; no page content is read, and nothing is transmitted. This extension does NOT use the webRequest API and runs no content scripts that read page data. It makes no outbound network requests of any kind. The principle is simple: nothing about your browsing is collected, and nothing is transmitted. Full privacy policy: https://extkit.dev/focusflow/policy