Windows 10 and 11 · 64-bit · Free · No account
More web.
Less browser.
Lean Browser blocks ads inside the browser and keeps your accounts separate with Contexts. Your websites and extensions work the way you expect.
Lean Guard
Ad blocking lives
inside the browser.
It does not depend on an extension or a store. It works from the first launch, and you can allow a site with one click if something breaks.
Each Context can use its own blocking level. The local history of blocked domains is removed after seven days.
Contexts
Your accounts, separated.
One window.
Each Context keeps its own cookies, storage, cache, and network connections. Use two accounts on the same website without switching profiles.
Contexts also present different browser signals for canvas, WebGL, audio, and deviceId.
They do not hide your IP address. History, passwords, and permissions remain shared.
Parentheses
A temporary window for looking without keeping.
Open a link in Parentheses when you want a clean, temporary space. Close the window and its local browsing data goes with it.
It is useful for one-time checkouts, unfamiliar links, and sessions you do not want mixed with your regular Contexts.
A quieter browser
The browser does not need to become another assistant.
No built-in chatbot.
No AI sidebar.
No account required.
Lean has no AI built into the browser. No chatbot beside your tabs, and no assistant that reads or writes for you. AI tools remain websites you choose to open, like any other.
Why Lean is a browser without AI →