Zephium: a browser and work environment for you and your agents

Available now for Mac and Windows

Fast, private and fully featured. Free and open source.

Star on GitHub

Skip the demo

Ads & trackers blocked294Focused1h 12mDue today2Nothing overdue

Your memoryMemory

Trip planningSkill

You · 10:42 AM

Plan two weeks in San Francisco for a founder trip in March, flying from London. Stay near SoMa and keep it under $6k.

Which two weeks in March, and do you need a proper desk where you stay?

Mar 2 to 16. Yes, a real desk.

Is nonstop worth paying more for?

If it's under £150 more.

StaysReading listings…

Working

staybook.comStays in SoMa · Mar 2 to 16

staybookSoMaMar 2 to Mar 161 guest

PriceWorkspaceEntire placeWi‑Fi 100+ MbpsSelf check-in

Light-filled loft with a real deskEntire loft · SoMa★ 4.96 · $3,120 total

Quiet one-bedroom by the ballparkEntire apartment · Mission Bay★ 4.91 · $2,860 total

Garden studio with fast Wi‑FiEntire studio · Hayes Valley★ 4.88 · $2,540 total

Light-filled loft with a real deskEntire loft · SoMa★ 4.96 · $3,120 total

Quiet one-bedroom by the ballparkEntire apartment · Mission Bay★ 4.91 · $2,860 total

Garden studio with fast Wi‑FiEntire studio · Hayes Valley★ 4.88 · $2,540 total

$3,120$2,860$2,540$4,410

FlightsComparing fares…

Working

flightfinder.comLondon ⇄ San Francisco · Mar 2 to 16

flightfinderLondon (LHR) → San Francisco (SFO)Mar 2 to Mar 161 adult

BestCheapest · £512Fastest · 10h 55m

KLM06:05 to 12:40LHR → SFO14h 35m1 stop · AMS£512

United09:45 to 12:50LHR → SFO11h 05mNonstop£634

British Airways11:20 to 14:15LHR → SFO10h 55mNonstop£742

Virgin Atlantic14:30 to 17:35LHR → SFO11h 05mNonstop£768

KLM06:05 to 12:40LHR → SFO14h 35m1 stop · AMS£512

United09:45 to 12:50LHR → SFO11h 05mNonstop£634

British Airways11:20 to 14:15LHR → SFO10h 55mNonstop£742

Virgin Atlantic14:30 to 17:35LHR → SFO11h 05mNonstop£768

Stays near SoMa, Mar 2 to 16

Light-filled loft with a real deskEntire loft · SoMa 4.96 (112)

Workspace: Desk and monitor
Getting around: 8 min walk to Caltrain

$3,120 / 14 nights

Quiet one-bedroom by the ballparkEntire apartment · Mission Bay 4.91 (64)

Workspace: Desk by the window
Getting around: 12 min to SoMa

$2,860 / 14 nights

Garden studio with fast Wi‑FiEntire studio · Hayes Valley 4.88 (203)

Workspace: Kitchen table only
Getting around: 20 min to SoMa

$2,540 / 14 nights

London ⇄ San Francisco, return

KLM£512 return

06:05LHR14h 35m1 stop · AMS12:40SFO

UnitedTop pick£634 return

09:45LHR11h 05mNonstop12:50SFO

Nonstop for £122 more, within what you said.

British Airways£742 return

11:20LHR10h 55mNonstop14:15SFO

Virgin Atlantic£768 return

14:30LHR11h 05mNonstop17:35SFO

Plan · Mar 2 to 16

Two weeks in San Francisco

Take the SoMa loft for its desk and the walk to Caltrain, and fly United nonstop. Together they come to about $3,970 before food and transport, well under your $6k. UK passports need an approved ESTA before you board.

$3,120Loft · 14 nights£634United · return

Before bookingApply for an ESTAUsually approved within 72 hours; apply before you pay for flights.
Mar 2Fly London → San FranciscoUnited · LHR 09:45 → SFO 12:50 · nonstop£634 rtn
Mar 2 to 16Stay in SoMaLight-filled loft · desk and monitor · 8 min to Caltrain$3,120
Mar 16Fly San Francisco → LondonUnited · SFO 16:10 → LHR 10:25 +1 · nonstop

Make tasksstaybook.com · flightfinder.com · esta.cbp.dhs.gov

SF founder trip

92%

0Tasks

Apply for an ESTASF founder trip
Book the SoMa loft for Mar 2 to 16SF founder trip
Book United LHR → SFOSF founder trip
Put the trip on the calendarSF founder trip
Share the plan with AlexSF founder trip

Search or enter an address

Your browser, as it should be.One switch, and it is ready for work.Ask in your own words.It asks before it guesses.Helpers work on live sites, in plain sight.Every finding, side by side.Keep the plan, not the transcript.Then turn it into tasks.

First, a great browser.

Fast, private and fully featured, with everything you need already inside.

theverge.comBlocking ads and trackers

0blocked on this page

Ads and trackers, gone. A native blocker turns them away at the network, before a page can load them.

1Password
Bitwarden
Grammarly
Dark Reader
SponsorBlock
Notion Web Clipper

Your extensions come along. The ones you rely on, straight from the Chrome Web Store.

Everything, one shortcut away.

Tabs, tasks, notes, history and downloads, from anywhere on your desktop.

⌘⇧Space

Zephium's launcher, listing open tabs with tasks, notes, history and downloads beside them.

AI is optional.
Disable anytime.
Customize everything.

Pick any model, or none at all. Zephium is a full browser either way.

Ours, if you like. No keys to manage, and nothing you send is kept.

No telemetry: Nothing about how you browse is collected.
No account to browse: Until you sign in, Zephium never contacts our servers.
Open source: Every line is on GitHub, under MPL-2.0.

Work, on a canvas.

Describe the outcome. Agents open real pages, compare and build, and leave you something to keep.

A whole Work run in Zephium: the request and its context, three helpers reading Uptime Kuma, Gatus and OpenStatus on their own sites, a local helper checking the endpoints, the status page it built, then the answer, a comparison table and charts, a diagram of how it fits, the config and four tasks. — One request, the whole run. Helpers read three projects on their own sites, a local helper checked the endpoints, and the agent built the pick, weighed all three and left the config and the tasks.

Live pages. Helpers browse real sites, and you can watch every one.
Helpers in parallel. The lead splits the goal and sends a helper after each part.
Your files. It reads and edits folders you grant, and asks before changing a thing.
Code and commands. It writes and explains code, runs commands and maps a system.
Your tools. MCP servers and the command lines you already use, like GitHub and Slack.
Your context. Tabs, history, tasks and notes, whenever you let it look.
Results that last. Tables, charts, comparisons and plans stay on the canvas.
Your models. Your own keys for OpenAI, Anthropic or Gemini, or a local model.

A canvas holding tabs from GitHub, Notion, Slack and DuckDuckGo, a note, a YouTube video, an image and a folder.

Bring anything onto the canvas. Tabs, files, folders, images and links, side by side. Connect your tools through MCP and the command line, and agents work with all of it.

Your day, beside the page.

Tasks, notes and activity live in the sidebar, and your agents can use them whenever you let them.

Today2 open

Add a taskFri, 10:00

Record the launch film
Reply to the design review2:30 PM
Book flights to San Franciscoflightfinder.com

Tasks in your own words. Write it the way you would say it, and it lands on the right day.

React notes

Actions run async work in a transition and keep track of pending and errors for you.

const [error, save, pending] =
  useActionState(update, null);

<form action={save}>

use() reads a promise while rendering
ref is a plain prop now

Notes beside the page. Markdown files you own, with code that stays code.

Time & Focus

4h 52mon the web

Focus 38 min left · distractions blocked

linear.app1h 24m
github.com58m
notion.so41m

See where the day went. Time by site, and focus that keeps distractions shut.

Native, all the way through.

Zephium is not a fork of Chromium or Firefox. We built the browser ourselves, in Rust, and pages render in the engine your system already ships and keeps up to date. A browser of our own, with no second copy of a browser engine to download and hold in memory.

RustA native core, fast and memory safe.
WKWebViewThe engine of Safari, on macOS.
WebView2The system's own engine, on Windows.

40 MB: app size
Instant: to start
Lighter: on memory
Longer: on battery

See it in motion.

The launch film: the browser, Work, and what your agents do with both.

Questions, answered.

Is Zephium built on Chromium?

No. Zephium is written in Rust and draws pages with the engine your system already has: WKWebView on macOS and WebView2 on Windows. The interface, the blocker, the agents and the storage are all its own.

Do I need AI to use it?

No. Zephium is a complete browser with Work switched off. When you want agents, use Zephium's own AI, bring your own key for OpenAI, Anthropic or Gemini, or run a model locally.

Which extensions work?

The major Chrome extensions work today, including 1Password, Bitwarden, Grammarly, Dark Reader and SponsorBlock, installed from the Chrome Web Store. A few extensions use features Zephium does not support yet, and support for more is coming soon.

What leaves my device?

Nothing about how you browse. There is no telemetry, your data is stored on your device, and you never need an account to browse. When an agent works, you see on the canvas which pages and notes it sends to the model you chose.

Can agents act without me?

Agents work in pages you can see, and you can stop a run at any time. They ask before they change your files, and you decide which folders they can reach.

Is it free?

The browser is free and open source, under the Mozilla Public License 2.0. Zephium AI starts you with 250 free credits, and Pro and Max add 2,000 or 10,000 every month. With your own keys or a local model, you pay only your provider, or nothing at all. See pricing.

When are Intel Macs, Linux, iOS and Android coming?

Intel Macs and Linux are next, and the mobile apps follow. Watch the repository's releases on GitHub, or follow the changelog feed, to hear when they land.

Built in the open.

Zephium is made in public, with the people who use it. Read the code, send a fix, or come and say hello.

930 stars · 8 contributors

Zephium for Linux is coming.

Get one email when it's available.

One release notification, not a newsletter, and no account. Privacy