A fast, fully-featured browser and work environment reimagined for you and your agents
Zephium (zephium-browser/Zephium)
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Zephium README
The project's README from github.com/zephium-browser/Zephium. As one markdown file: README.md.
Zephium
A fast, fully featured browser and work environment,
reimagined for you and your agents.
Website · Docs · Launch film · Download
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Safari's efficiency. Brave's protection. Arc's design.
And Work, a canvas where your agents do real work in plain sight.
Zephium is an open-source browser built in Rust on your operating system's own web engine: WebKit on macOS, the engine Safari uses, and WebView2 on Windows. It is not a fork of Chromium or Firefox. It blocks ads and trackers natively, runs Chrome extensions, and puts tasks, notes and your time on the web one click away. The download is about 30 MB.
One switch away is Work. Your work already happens in the browser, where your tabs, logins and history are. Work brings agents there instead of asking you to move somewhere else, and lets you watch them do it.
Work
Describe an outcome in your own words: plan a trip, compare vendors, design a system, fix a bug. Work takes it from there on a canvas, and you see every step.
Asked for a status page, Work reads three monitors on their own sites, checks your endpoints from your machine, builds the pick, and leaves the comparison, the config and the tasks on the canvas.
- It starts from what you already have. Work recalls what it knows about you, searches your history when it helps, and loads the right skill for the job. Each step appears on the canvas as it happens.
- Helpers work in parallel, in the open. For a trip, one helper looks for flats while another checks visas and a third compares flights. They browse live pages you can watch, and any source opens in a pane beside the canvas.
- Results stay on the canvas. Comparisons, tables, charts, diagrams, plans, code and documents are laid out where you can read them. They are not lost in a chat scroll.
- A plan becomes your day. One click turns each step of a plan into a task linked back to the Work. Anything worth keeping can be saved as a note.
- It reaches past the browser. Work reads and edits the folders you grant,
runs commands, and hands larger coding jobs to Claude Code or Codex. It
connects to MCP servers such as Linear, Notion, Sentry, Stripe and Figma, and
to command-line tools such as
gh. - You stay in charge. Anything that posts, merges or changes something waits for your OK.
- Bring any model. Use your own keys for Anthropic, OpenAI, Google Gemini, xAI, Mistral, DeepSeek, Groq, Cerebras or OpenRouter, or run a model locally through Ollama, LM Studio or any OpenAI-compatible server. Keys live in your system keychain. Or sign in to Zephium AI and skip the keys: it picks the right model for each step, and you start with free credits (pricing).
Work ships with 25 skills, including trip planning, research, compare and choose, plan my day, fix a bug and weekly status. You can write your own.
Ask Zephium
An assistant in the sidebar, on ⌘ E (Ctrl E on Windows). It reads the page
you are on and answers about it, points at what is worth your time, and opens
what you choose in new tabs. Ask it to take a few steps on the page, or to
restyle a site you visit every day, and it does it in place. When a job
outgrows a chat, Continue in Work carries it to the canvas, with the page
along.
Asked what is worth reading, it picks three stories, opens them, and re-sets the front page as calm cards.
Browse
Fast and light
- Native WebKit on macOS and WebView2 on Windows, so pages run on the engine your system already keeps up to date.
- Inactive tabs go to sleep and wake when you return, so memory stays low with many tabs open.
- A native ad and tracker blocker, on by default, built on Brave's adblock-rust with EasyList and EasyPrivacy. Requests are stopped before a page can make them, and you can hide anything else on a page with a click.
Designed to live in
- A new tab that opens onto the sky, by day or by night with your theme, with your time, your focus and the day's tasks along its foot.
- Vertical tabs in a quiet sidebar, with spaces, profiles, pinned tabs, folders and split view.
- Liquid Glass on macOS 26 and Mica on Windows 11.
- A launcher on
⌘ ⇧ Space(Ctrl Shift Spaceon Windows) reaches tabs, history, notes and commands from anywhere on your desktop. Anything you type there can become a task. - Every keyboard shortcut can be changed.
Extensions
Install extensions straight from the Chrome Web Store. Twenty popular ones are verified to work well in Zephium and are a click away in the extension manager, including 1Password, Bitwarden, Grammarly, DeepL, Dark Reader, Vimium, SponsorBlock, Raindrop.io, Notion Web Clipper and Refined GitHub.
Bring everything with you
The welcome flow imports from Chrome, Safari, Arc, Zen, Firefox, Brave and Edge.
Built in
 |
 |
 |
| Tasks Write them the way you would say them, like "call Anna tomorrow at 3". Lists, priorities, deadlines, subtasks, and the page you were on stays linked. |
Time See where your time on the web goes, counted on this device only. Start a focus round and the sites you choose stay shut until the break. |
Notes Notes beside the page, each a Markdown file you own. Edits from other apps show up in Zephium. |
Private by default
- No telemetry. Zephium doesn't collect or send anything about how you browse.
- No account needed. History, tasks, notes, memory and time live on your device. An account is only for Zephium AI, and until you sign in, Zephium never contacts our servers.
- Zephium AI keeps no content. Requests pass through to the model that answers them. We count usage for your plan, never store prompts, answers or pages, and never see your card.
- Private windows keep nothing once they close.
Download
| Platform | Architecture | Installer | Requires |
|---|---|---|---|
| macOS | Apple Silicon | Zephium-macOS-arm64.dmg |
macOS Sonoma 14 or later |
| Windows | x64 | Zephium-Windows-x64-setup.exe |
Windows 10 or 11 |
Windows builds are not code-signed yet, so SmartScreen may show "Windows protected your PC". Choose More info, then Run anyway. Signing is on the way.
Zephium downloads updates in the background and installs them when you choose Relaunch to update. All releases are on the releases page.
What's next
- Linux and Intel Macs.
- Code-signed Windows builds.
- More extensions verified to work, and native extensions built into Zephium.
- And much more.
Build from source
Prerequisites:
- Rust through
rustup. The toolchain pinned inrust-toolchain.tomlinstalls itself on first use. - Node.js, at the version in
.node-version. - pnpm, through Corepack:
corepack enable. - The Tauri prerequisites for your platform: Xcode Command Line Tools on macOS, or the Microsoft C++ Build Tools and WebView2 on Windows.
git clone https://github.com/zephium-browser/Zephium.git
cd Zephium
pnpm install --frozen-lockfile
pnpm dev
Development builds use their own app.zephium.dev profile, so they do not
touch the data of an installed Zephium. Linux is not supported yet. See
CONTRIBUTING.md before opening a pull request.
Architecture
- Untrusted pages run in raw native WebViews, apart from the privileged Svelte interface that draws the browser.
- A Rust core owns tabs, storage, the blocker, extensions and agents.
- Each profile has its own isolated website data and Zephium-owned history, session and favicon data.
- The network blocker is native and built on Brave's adblock-rust.
- Narrow in-tree adapters for Tauri and Wry handle storage policy, WebView construction, callbacks and teardown.
Read more in docs/architecture.md and docs/security-model.md.
Contributing
Zephium is maintained by one person with a clear product direction, so please discuss larger changes before writing them. CONTRIBUTING.md explains what gets merged and how. Questions and ideas are welcome on Discord.
Security
Please report vulnerabilities privately, not in a public issue. See SECURITY.md.
License
Zephium is licensed under the Mozilla Public License 2.0.
The bundled EasyList and EasyPrivacy filter lists are used under CC BY-SA 3.0; see the notice for attribution.
The Zephium name and logo are not licensed under the MPL.
Acknowledgements
Zephium stands on Tauri, Wry, Brave's adblock-rust and EasyList.