LensBrief is a lightweight Chrome extension that gives you a clear, contextual explanation when you select a word or expression.
No chat window. No prompt to write. Just select and read.
Select any word or phrase for instant contextual clarity. Designed to match your favorite reading theme.
Everything you need to read faster, comprehend deeper, and stay completely in the zone.
Contextual explanations delivered in under 200ms by our dedicated high-speed AI engine.
Never a generic dictionary definition. Our AI explains the exact role and meaning of the term in your text.
Need a more thorough breakdown? One click triggers an in-depth, structured multi-point explanation.
Processed ephemerally in memory. Your reading habits, selected texts, and browsing history are never stored.
Start for free, upgrade to Plus whenever you need unlimited power.
For casual daily reading & discovery
For avid readers, researchers & students
Best value for full-year power readers
Everything you need to know about LensBrief.
Simply hold the Ctrl key (or Cmd ⌘ on Mac) and hover over any word, or select any text. You can also click the extension icon to toggle active reading mode.
Never. No browsing history, page contents, or selected text are ever stored on our servers. Requests are processed ephemerally in-memory strictly to generate the instant explanation.
Yes, you can cancel your subscription at any time with a single click. Your Plus benefits will remain active until the end of your paid billing period.