YesEveryone is forking a WebKit browser. We spent the tokens so you don't have to.
Copper is a fast little Mac browser with agents built in, plus a server you run yourself. MIT, all of it.
brew install --cask copper-browser/copper/copper
Copper for macOS
Split view, ⌘K, folders, Favorites, Today and Saved. WebKit underneath, no account.
Any MCP agent drives the browser you're signed into. Every tab wears a badge for who's in it, and Stop gives it back.
200ms
Bitwarden, on your Mac or a headless Mac mini. The password never reaches the agent.
One Rust binary and Postgres. Syncs spaces, tabs, bookmarks and history between Macs.
Stickies, live sites, your team and their agents.
MIT
The browser and the server. Read it, build it, fork it.
github.com/copper-browserThe parts of Arc people miss are here: spaces with their own animated themes, Favorites, Saved and Today, folders, tab groups, split view, a ⌘K command bar and auto-archive.
It runs on the WebKit already inside your Mac, so there is no second copy of Chromium to download, update and keep in memory.
A small working copy of Copper's window. Click a tab, switch spaces, find any tab by name, or hide the cookie banner for good.
No toolbar, no start page, no sidebar of suggestions, no account to sign into. The things people install extensions for are already here, each one keystroke away.
Type an address and you go there; type words and you search. Nothing you type is sent anywhere until you press Return.
Across the top or down the left. Pinned tabs shrink to a letter, and last session's tabs cost nothing until you click them.
Rows of tabs with a name, an icon and a colour the whole column wears, and optionally a profile of their own.
Lists your open tabs by name as you type. The one you are on is always unmistakable.
Click a cookie banner or a newsletter overlay away. It stays gone on that site next time, before the page draws a frame.
Strips a page down to the article.
Trackers and ad networks are stopped at the network level, so there is nothing to render and nothing to slow you down. On by default, off per site.
Lifts the video into a small window that stays above everything, including other apps.
Saved once a sign-in has actually worked, offered when you click the field, never filled on its own. Encrypted by macOS.
A new build is downloaded and verified in the background first. Copper never restarts without your say-so. Light, dark, or the Mac's own — the frame and the pages follow.
Flow is one button. It reads the other browser's files on your Mac and never changes them. Imported pages stay asleep until you visit them, and macOS asks once before handing over the other browser's key.
Paste a Chrome Web Store link, or press Add on the extension's page. It runs on WebKit's own extension engine, the one Safari uses, and Copper fills in the Chrome APIs WebKit lacks. macOS 15.4 or later.
Copper is an MCP server. Claude Code, Codex or any MCP client can drive the browser you're already signed into. Copper draws where each agent is about to click and badges every tab with the agent working in it. Press Stop and the browser is yours again.
copper command for the shell, linked into your PATH by Homebrew. It never starts Copper on its own.$ copper health
Copper health: running: true
Jev mode: on
$ copper tabs
### Open tabs
- 0: (current) [Google] (https://www.google.com/)
- 1: [Copper - Wikipedia] (https://en.wikipedia.org/wiki/Copper)
- 2: [Mac - Apple] (https://www.apple.com/mac/)
- 3: [Hacker News] (https://news.ycombinator.com/)
$ Hand Copper a goal, not a list of clicks. Jev reads the page's controls, picks an operation and an element in about 200 ms, and acts, instead of waiting on a large model for every click. A small model writes any text it has to type.
Bring your own key: sign in with a Claude account, or point Copper at any OpenAI-compatible gateway.
jev_runjev_stepjev_observejev_extract
Run a goal to the end, take one step at a time, see the page the way Jev sees it, or pull structured values out of it. The model's output never becomes a selector, a coordinate or JavaScript.
Type /jev <goal> in Claude Code or phi, or copper run "goal" in a terminal. The goal goes to Jev on the first call, with no tab list or snapshot first.
Settings › Agents › Terminal agents: press Set up for phi or Claude Code, or Install for the CLI. Copper writes the config and the command for you, so no token is pasted into a prompt.
A pill on the page says Jev is driving, and the driver timeline (⌥⌘J) shows every cycle: read, ask, act, settle. Press Stop and the browser is yours again before Jev's next action.
You are reading about copper on Wikipedia and want the article on the green that grows on old roofs. You hand Jev one sentence and watch the timeline.
11.4 seconds, three actions. Jev clicked Search, a small model wrote the word, and Jev picked the article from Wikipedia's own suggestions. Then it stopped, because the article was on screen.
DONE is Jev's claim, and the tool says so. Your agent is told to check the page before it tells you it worked.
$ copper run "Search Wikipedia for patina and stop when the article is visible"
### Jev run — done in 11.4 s (3 actions, 4 decisions)
Jev said DONE, 96% sure
1. CLICK Search (100%, 372 ms) → page changed
2. TYPE_TEXT Search Wikipedia = "patina" (100%, 290 ms + 1296 ms text) → page changed
3. CLICK Patina Change of object's surface through age and exposure (61%, 268 ms) → page changed
### Page
- URL: https://en.wikipedia.org/wiki/Patina
- Title: Patina - Wikipedia
$ Connect Bitwarden and your agents use your saved logins, two-factor codes included, on your Mac or on a headless Mac mini. The password never reaches the agent, and you decide which logins they can use.
Agents folder are shared; a copper-agent: deny field keeps one out for good. Agents can't change the rule.browser_autofill. Driven by Bitwarden's own bw client, no extension.
Canvas is a whiteboard that opens in an ordinary tab: stickies, text, frames, arrows, images and live websites. Your Personal canvas stays on this Mac and works with no network.
Link Copper Cloud to share a board and you see everyone's cursors, agents included. The ⌘E agent, MCP agents and the copper command all read and write the same boards. Friends who aren't on Copper can join from any browser: the canvas is open source too.
The board Copper shows in a tab is its own project, canvas-app. Copper ships its page, and Canvas App is the same page in Chrome, Firefox, Safari or Edge, with nothing to install. It keeps your boards in the browser, works offline, and joins shared boards live, cursors and all.
Copper Cloud is the server half: one Rust binary and Postgres, installed with one command on any Linux machine, or with Terraform on AWS. It syncs spaces, tabs, bookmarks and history between your Macs and hosts live canvas rooms.
curl -fsSL https://raw.githubusercontent.com/copper-browser/copper-cloud/main/install.sh | sudo sh
The only things that leave your Mac are the pages you ask for, their icons, and one small request a day to see whether there is a newer version. Copper Cloud is the one exception, and it stays off until you link a server you run.
| What | Where it is | Who can read it |
|---|---|---|
| Passwords | The macOS login keychain, as ordinary keychain items tagged Copper, or your Bitwarden vault if you connect one | Copper. Any other app triggers the system's permission dialog. |
| History, bookmarks, open tabs, hidden elements | Small JSON files in ~/Library/ | You. |
| Cookies and site data | WebKit's own store for the app | The sites that set them, as in any browser. |
| Extensions | Unpacked in Copper's own folder, their data in WebKit's extension store | Each extension, within the permissions you accepted. |
| Copper Cloud, only if you link it | The parts you switched on, on the instance you linked, encrypted at rest with your account's key | You, and that instance's operator. |
| Anything else | Nowhere. | No one. |
A private tab (⇧⌘N) has its own cookie jar and leaves nothing behind when it closes.
For macOS 14 Sonoma or later, on Apple Silicon. Pick one; after that Copper updates itself.
brew install --cask copper-browser/copper/copperAlso links the copper command into your PATH.
curl -fsSL https://github.com/copper-browser/Copper/releases/latest/download/copper-install.sh | shThe same build, without Homebrew.
Unzip it and drag Copper.app to Applications.
About the first launch. Copper builds are ad-hoc signed, not notarized. Homebrew and the installer clear the quarantine flag for you. After a manual download, run this once, or right-click Copper and choose Open:
xattr -cr /Applications/Copper.appThe browser, the server and the canvas. Read it, build it, fork it. No account, no telemetry, and issues and pull requests are welcome.
Built by Collin Rijock and Felipe Arce. We built it at ShellHacks at FIU.
