The Lucium icon

Your tabs on the left.
The web on the right.

Lucium keeps your tabs in a sidebar, with a Space for each part of your life. No account. Free, for Mac.

Download for Mac See the 130 features › Watch the film ›

Version 0.2.0, in alpha · Mac with Apple silicon · macOS 13 or later

The Lucium window: the Work Space with its favorites, pinned tabs, folders and today’s tabs, the notebook on screen

0accounts to create

0telemetry

4pages side by side

30 minand a forgotten tab goes to sleep

One Space for work. Another for everything else.

Each Space keeps its own tabs, its own color and, if you like, its own profile. Swipe with two fingers to switch.

See the 130 features ›
The Home Space, with its colors and its tabs, seasonal recipes on screen
The command bar of a new tab (⌘T): the calculation 12*(3+4) and its result on the first row

Type it. Found it.

⌘T opens the command bar: an address, a search, an open or archived tab, an action, a sum.

Several pages, one window.

Split View with two panes: the project board and the notebook side by side

Side by side.

Up to four pages in one window. Drag a tab onto the page to split it.

Glance: a link of the notebook opened as a preview with Shift-click, over the page

A glance.

Shift-click a link and it opens in a preview, while your page stays put.

A mini window: the museum hours opened apart, without leaving the Space

A mini window.

Links from other apps open on their own, without cluttering your Spaces.

Your Mac breathes easier.

Idle tabs go to sleep after 30 minutes. At the foot of the sidebar, a gauge shows how much memory Lucium holds; one click opens the heaviest tabs, each one click away from sleep or closing.

The resource panel, open at the foot of the sidebar: memory and the tabs that use the most

No account. No telemetry. No surprises.

The ad and tracker blocker is on from the first launch. Every connection Lucium makes on its own is listed in public.

See every connection ›
  • Blocker filter listsAt first launch, then checked every hour
  • Search suggestionsAs you type, to the search engine you chose
  • Protected video moduleAt every launch, so protected video plays
Lucium Settings, Privacy and security pane

Your extensions. Your shows.

Install your Manifest V3 extensions from the online extension store. Protected video plays too.

Compatibility varies by extension: tell us which one breaks.

Switching browsers? Your habits come along.

Lucium imports the bookmarks and history of your current browser and, depending on what it stores, its Spaces, pinned tabs, folders and favorites. No account.

Switch browsers ›
The import sheet: a bookmarks file ready to import, 12 bookmarks in 3 folders, and nothing imported before you confirm
  • Boreal icon
  • Dusk icon
  • Nebula icon
  • Cyber icon
  • Solar icon
  • Abyss icon
  • Sepia gold icon

Seven icons to choose from, shown in the Dock while Lucium runs.

Free. Open source. For good.

GPL-3.0 license. No paid edition, no ads, no AI assistant. The community suggests and votes: the most-wanted ideas come first.

Suggest an idea ›

Lucium in one minute.

An animation, texts on screen, in English · also in French

Read the texts of the film
  1. Lucium. Your tabs on the left, the web on the right.
  2. A Space for work. Another for the rest.
  3. ⌘T: type, and it’s found. An address, a tab, an action, a calculation.
  4. Several pages, one window: side by side, as a preview, in a mini window.
  5. Idle tabs go to sleep. Your Mac breathes.
  6. No account. No telemetry. The blocker, from the first launch.
  7. Your extensions, your videos, and the tabs of your current browser.
  8. Free. Open source. For Mac.
  9. lucium.app

Try Lucium.

Download for Mac

Or with Homebrew [to be confirmed]

brew install --cask lucium

Version 0.2.0, in alpha · Mac with Apple silicon · macOS 13 or later · Release notes