Lucium in brief.
What Lucium does, and what it does not. Every cell comes from the application’s code; the “No” answers are shown like the others.
| Criterion | Lucium | Details |
|---|---|---|
| Model | ||
| Free | Yes | No subscription, no ads |
| Paid edition or subscription | No | None |
| Open source | Yes | GPL-3.0 license |
| Privacy | ||
| Account required | No | No account, no address |
| Sync | No | By choice: your data stays on this Mac |
| Telemetry by default | No | Every connection is listed on the Privacy page |
| Blocker on by default | Yes | Ads and trackers, from the first launch |
| Built-in AI assistant | No | A page summary exists as an option, off by default |
| Organization | ||
| Vertical sidebar | Yes | Favorites, pinned tabs, folders and today’s tabs |
| Spaces | Yes | Each with its tabs, its color and, if you like, its own profile |
| Split view | Yes | Up to four pages side by side |
| Command bar | Yes | ⌘T: address, search, tab, action, calculation |
| Compatibility and platforms | ||
| Manifest V3 extensions | Partial | Compatibility varies by extension |
| Import from your current browser | Yes | Bookmarks and history; Spaces and tabs when Lucium reads its format |
| Windows | No | Planned for December 2026, if the trials go well, and Linux right after: see the roadmap |
| Automatic updates | No | Not yet: no feed is plugged in |
Speed, memory and battery are not listed here: no measurement has been made yet.
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