Open source · macOS

A native browser
for Mac.

Spaces, a vertical sidebar, split view. SwiftUI for the chrome. Chromium for the pages. You build it from source — there is no installer yet.

Build from source Read the repository

Apple Silicon · macOS 14 or later · Python 3.12+ · Xcode command-line tools

PERSONAL SPACE / 01

Where to?

Search the web or pick up where you left off.

PICK UP WHERE YOU LEFT OFF

READING LIST

The web is
what we make it.

A space for ideas, open conversations, and things worth exploring.

Keep exploring.

Spaces

Work and the rest of life don’t share a session.

Each Space keeps its own tabs, favorites, and website sign-ins. Switch at the bottom of the sidebar.

Try the three Space buttons in the preview.

0104

Interactive previewNot a live browser

What it actually is

Tabs: Pin pages, nest them in folders, drag them between Spaces. The sidebar is the tab strip.
Keys: ⌘T opens search. ⌘S toggles the sidebar. The rest is meant to stay out of the way of the page.
Native: SwiftUI and AppKit draw the interface. CEF runs Chromium for the websites themselves.
Limits: No extensions, no sync, no password manager. It is early, and the README lists what is missing.

Independent of Arc.
Inspired by the same habits.

Favorite places, a sidebar a shortcut away, Spaces that don’t leak cookies into each other. Derivative is a separate project by A Browser Guy. The source is public because the browser should outlast any one company.

github.com/lamdiv/derivative

Interface SwiftUI, AppKit
Web Chromium via CEF
License Open source
Status Build from source

Before you clone it

Can I download a build?

Not yet. You compile it on an Apple Silicon Mac running macOS 14 or later, with Python 3.12+ and Apple’s command-line tools. The repository has the steps.

What works today?

Spaces with separate website storage, favorites, pinned tabs and folders, split view, floating search, downloads, and sidebar customization. The README covers the current limits.

Extensions, sync, passwords?

None of those are implemented. File an issue if you want to work on one of them.

Is this Arc, or The Browser Company?

No. Derivative is an independent open source project. Arc is an influence on the browsing model, not an affiliation.

Build it on your Mac

Clone the repo, follow the local run instructions, and compile. Developer tools required. No packaged download.

Open the build instructions

A native browser for Mac.