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f:Ta29,{"@context":"https://schema.org","@graph":[{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://mailshade.org/"},{"@type":"ListItem","position":2,"name":"Compare","item":"https://mailshade.org/compare/"},{"@type":"ListItem","position":3,"name":"Best email tracker blocker: five tools compared","item":"https://mailshade.org/compare/best-email-tracker-blocker/"}]},{"@type":"Article","headline":"Best email tracker blocker: five tools compared","description":"Ugly Email, PixelBlock, Trocker and Gblock are Gmail-first. Mailshade network-blocks known pixel domains across 6 opt-in clients and is AGPL-3.0.","inLanguage":"en","image":"https://mailshade.org/og/compare/best-email-tracker-blocker.png","mainEntityOfPage":"https://mailshade.org/compare/best-email-tracker-blocker/","author":{"@type":"Organization","name":"Mailshade","url":"https://mailshade.org"},"publisher":{"@type":"Organization","name":"Mailshade","url":"https://mailshade.org"}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Which email tracker blocker covers the most clients?","acceptedAnswer":{"@type":"Answer","text":"Mailshade, with six: Gmail, Outlook, Office 365, Superhuman, Yahoo Mail and ProtonMail. Trocker covers three (Gmail, Outlook, Yahoo); the others are Gmail-only."}},{"@type":"Question","name":"What is the difference between blocking and warning a tracker?","acceptedAnswer":{"@type":"Answer","text":"Warning tools like Ugly Email mark a tracked message but the pixel still loads, so the open leaks. Blocking tools cancel the request via declarativeNetRequest before it fires, so nothing reaches the sender."}},{"@type":"Question","name":"Which blockers are open source?","acceptedAnswer":{"@type":"Answer","text":"Ugly Email, Trocker and Mailshade are open source; PixelBlock and Gblock are closed. Mailshade is under AGPL-3.0 at mailshade.org/source/, so you can audit its blocking logic."}},{"@type":"Question","name":"Is there a tracker blocker for Superhuman?","acceptedAnswer":{"@type":"Answer","text":"Mailshade is the dedicated option for Superhuman. None of the standalone rivals cover it; Superhuman has a built-in setting but it is off by default and single-client."}},{"@type":"Question","name":"How much does Mailshade cost compared with the free options?","acceptedAnswer":{"@type":"Answer","text":"Ugly Email, PixelBlock and Trocker are free; Gblock is paid. Mailshade keeps core protection, seven days of history and a top-10 sender view free after a 14-day Pro trial; paid Pro starts at $3.99 per month or $19 one-time."}}]}]}4:["$","main",null,{"className":"container-x py-16","children":[["$","script",null,{"type":"application/ld+json","dangerouslySetInnerHTML":{"__html":"$f"}}],["$","article",null,{"className":"prose prose-ink max-w-none","children":[["$","h1",null,{"children":"Best email tracker blocker: five tools compared"}],["$","p",null,{"className":"text-lg text-ink-200","children":"Most email tracker blockers were built for one inbox — Gmail — and several only flag trackers rather than blocking them, so the open still leaks. This comparison covers the five real options and where each fits. Ugly Email (50K+ users, 4.5 stars) is open source but Gmail-only and warns rather than blocks. PixelBlock (under 20K, 4.8 stars) is the highest-rated, but Gmail-only and closed. Trocker (under 30K, 4.7 stars) is open source and adds Outlook and Yahoo, yet skips Superhuman. Gblock (under 10K) is Gmail-only, paid and closed. Mailshade is the one built for multiple clients: it blocks at the network layer via declarativeNetRequest across Gmail, Outlook, Office 365, Superhuman, Yahoo Mail and ProtonMail, keeps a per-sender reporting dashboard in local IndexedDB, and ships its source under AGPL-3.0. The right pick depends on how many clients you use and whether you want code you can audit."}],"$L10","$L11","$L12"]}]]}]
13:T44e,<h2>The five options at a glance</h2><table><thead><tr><th>Tool</th><th>Clients</th><th>Blocks or warns</th><th>Open source</th></tr></thead><tbody><tr><td>Ugly Email</td><td>Gmail</td><td>Warns</td><td>Yes</td></tr><tr><td>PixelBlock</td><td>Gmail</td><td>Warns/marks</td><td>No</td></tr><tr><td>Trocker</td><td>Gmail, Outlook, Yahoo</td><td>Blocks</td><td>Yes</td></tr><tr><td>Gblock</td><td>Gmail</td><td>Blocks + IP proxy</td><td>No</td></tr><tr><td>Mailshade</td><td>6 opt-in clients</td><td>Known domains (DNR)</td><td>Yes (AGPL-3.0)</td></tr></tbody></table><h2>How to choose</h2><ul><li><strong>Gmail only, want simple and free:</strong> Ugly Email or PixelBlock.</li><li><strong>Gmail, Outlook or Yahoo, want open source:</strong> Trocker.</li><li><strong>Multiple clients, Superhuman, or want a per-sender dashboard and auditable code:</strong> Mailshade.</li></ul><h2>Why blocking beats warning</h2><p>A warning tool marks a tracker but can let its pixel fire. Mailshade uses declarativeNetRequest to cancel requests to known tracker-pixel domains, so those requests send no open signal.</p>10:["$","div",null,{"dangerouslySetInnerHTML":{"__html":"$13"}}]
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