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Stop the trackers behind your spam calls. Passlit Openbook detects and blocks them in real time. Free for Chrome. Passlit Openbook shows you exactly who's tracking you, by name, in real time. Most privacy tools tell you a number. Openbook tells you who: Google ran 47 trackers, Meta ran 12, a data broker is logging your behavior to resell to advertisers and telemarketers. Every company, named and categorized, on every page you visit. WHY THIS MATTERS Dozens of companies collect data about you on every site you visit. Ad networks, analytics platforms, and data brokers build behavioral profiles without your knowledge. That data gets sold, repackaged, and used to target you with ads, spam calls, and unwanted solicitations. Most tracker blockers stop this silently in the background. Openbook shows you exactly what's happening, then gives you the tools to act on it. WHAT OPENBOOK DETECTS, FREE Openbook identifies trackers across 5 categories: Ad Targeting — networks that follow you across the web to serve targeted ads Data Brokers — companies that buy, sell, and package your behavioral data Analytics — platforms that record your clicks, scrolls, and sessions Social — tracking pixels embedded by social platforms across millions of sites Fingerprinting — tools that identify you without cookies, using your device characteristics On a typical news site, Openbook detects 10 to 30 trackers. On high-traffic sites, often 50 or more. FREE FEATURES, NO ACCOUNT REQUIRED Real-time detection of 50+ known tracking companies Company name, category, and live activity count for every tracker Updates live as new trackers load on the page Injects Global Privacy Control on every page, a legally recognized do-not-sell signal under CCPA, CPA, VCDPA, and 9 other US state privacy laws Draggable badge, positions anywhere on screen Works on every major website No account, no signup, nothing to configure PASSLIT SHIELD, OPTIONAL UPGRADE Shield adds active protection on top of Openbook's detection: Blocks 50+ known ad targeting and data broker domains at the network level Wipes tracker cookies and cache on demand, one click Auto-clears tracker data every 30 minutes, so nothing accumulates during your session Automatically rejects cookie consent banners from OneTrust, Cookiebot, and Quantcast Choice In our testing, blocking these tracker domains cut page load time by up to 40% Live blocked-vs-detected counter, updated per page $14.99/month. Cancel anytime, no contracts. HOW IT WORKS Install Passlit Openbook, free, no account required Visit any website The badge shows your live tracker count Click it to see every company tracking you, by name Upgrade to Shield to block them and clear your data automatically GLOBAL PRIVACY CONTROL Openbook automatically sends a Global Privacy Control signal on every page you visit. GPC is legally recognized as a valid do-not-sell opt-out under California's CCPA, Colorado's CPA, Virginia's VCDPA, Connecticut's Data Privacy Act, and several other state privacy laws. Companies receiving the signal are legally required to honor it. YOUR DATA Passlit never sells or uses your personal data. Tracker detection runs in your browser. Openbook sends anonymized, site-level tracker counts to Passlit, used to publish research on which companies track the most across the web; no personal identity, account, or browsing history is ever attached. Full privacy policy at passlit.com/privacy. ABOUT PASSLIT Passlit is a consumer privacy company. Openbook is free because seeing who's watching you shouldn't cost anything.