Veb vs SigmaOS

Reference archive: this page documents the original Yab browser. Features, platforms and release dates here do not describe the current Veb prototype. Veb release plans →

We make Veb, so read it as our side.facts checked Oct 9 ↓

Veb, Very Expensive Browser, is a free Mac browser that keeps everything from Arc (tabs down the side, spaces, folders, Split View) and gives your Claude or ChatGPT plan an agent that works in your signed-in tabs.

SigmaOS is a Mac browser on WebKit that treats tabs like a to-do list, in workspaces down the side, with an AI assistant called Airis.

The short answer

Pick Vebours

if you miss Arc and want spaces, pins and folders kept, on a Mac
if you already pay for Claude or ChatGPT and want it to work in your signed-in tabs
if you want Claude Code, Codex or Cursor to drive a real browser over MCP

Pick SigmaOS

if you want workspaces and tabs you mark done, on a Mac
if you browse by keyboard, with single-key shortcuts
if you prefer WebKit to Chromium and want spaces

At a glance

Veb and SigmaOS, side by side.

Veb vs SigmaOS
What	Veb	SigmaOS
Made by	Serafim Korablev	SigmaOS Inc. (London)
Status	Updated	No release notes since February 2025
Runs on	Mac	Mac
Phone app	Veb for iPhone, in beta on TestFlight; syncs spaces, tabs, bookmarks, history and chats	None; Mac only. iOS has been on its roadmap since 2021
Price	Free; its AI runs on your own Claude or ChatGPT plan	Free; Personal Pro $20/month or Personal Max $30/month for more AI
AI	An agent that works in pages, on your Claude or ChatGPT plan	Chat about pages, on its own AI service
Driven by outside agents	MCP and a command line	No
Engine	WebKit	WebKit
Tabs down the side	Yes	Yes
Spaces	Yes	Yes
Split View	Yes	Yes
Extensions	Chrome Web Store	Chrome Web Store
Ad blocker	Built in	Built in
Open source	No	No

Checked October 9, 2026 on each maker’s own pages, linked under Sources. Prices are per month, in US dollars.

Where they differ

What separates them, area by area. Where one plainly has more, it says who; where it comes down to taste, it says so.

AIVeb leads

Only Veb has an agent that clicks, types and finishes tasks in your pages. Veb’s agent works in tabs of its own beside yours, signed in as you, on your Claude or ChatGPT plan; Send, Pay and Delete wait for your yes. Airis chats about the page you are on, sums it up, looks things up and translates; no agent. Veb runs on the Claude or ChatGPT plan you already pay for; the other on its own AI.

Agents like Claude Code and CodexVeb leads

Veb can be driven over MCP and a command line, through yab mcp and the yab command, for Claude Code, Codex, Cursor and any MCP client. SigmaOS has no MCP server or command line for outside agents.

Tabs and windowsVeb leads

Veb has tabs down the side, spaces, Split View, folders in the sidebar and tabs that sleep. SigmaOS has tabs down the side, spaces and Split View.

Priceeven

Veb: Free; its AI runs on your own Claude or ChatGPT plan. SigmaOS: Free; Personal Pro $20/month or Personal Max $30/month for more AI.

Where it runseven

Both run on Mac. On a Mac, Veb needs macOS 15.4 or later and SigmaOS needs macOS 12 or later. On the phone, Veb: Veb for iPhone, in beta on TestFlight; syncs spaces, tabs, bookmarks, history and chats. SigmaOS has no phone app: Mac only. iOS has been on its roadmap since 2021.

Engine and extensionsa matter of taste

Both are built on WebKit, the engine Safari uses. Both take extensions from the Chrome Web Store.

Privacyeven

Both have an ad blocker built in. Veb has no account and no server of ours between you and your sites; what your agent reads goes to Anthropic or OpenAI under your account. SigmaOS keeps history and cookies on your Mac unless you turn on sync, stored encrypted on AWS; its privacy policy doesn’t say where Airis requests go.

UpdatesVeb leads

Veb is updated as usual. SigmaOS: Still downloadable, with no public release notes since version 1.19 in February 2025.

Where SigmaOS is better

SigmaOS is the better pick if you:

Want workspaces and tabs you mark done, on a Mac
Browse by keyboard, with single-key shortcuts
Prefer WebKit to Chromium and want spaces

The catch with each

Real limits, from the makers’ own words and our own use.

SigmaOS

Mac only
No public release notes since version 1.19 in February 2025
Chrome extensions only partly work, behind its WebKit+ option
Its AI is an assistant, and regular use needs the $20 or $30 plans

Veb, honestly

Mac only for now: macOS 15.4 or later; the iPhone app is in beta, and there is no Windows or Android
New: first released in September 2026
Its AI needs a Claude or ChatGPT plan; ChatGPT’s free plan may work with low limits
WebKit, as in Safari: a site tested only in Chrome can misbehave
Closed source

What changed lately

September 25, 2026Veb: First release
February 4, 2025SigmaOS: Version 1.19.0, a performance update, the last release with public notes

Questions

Is Veb free?

Yes. Free; its AI runs on your own Claude or ChatGPT plan.

Is SigmaOS free?

Yes, with limits on its AI. Free; Personal Pro $20/month or Personal Max $30/month for more AI.

Which has an AI agent, Veb or SigmaOS?

Veb. Veb’s agent works in tabs of its own beside yours, signed in as you, on your Claude or ChatGPT plan; Send, Pay and Delete wait for your yes. Airis chats about the page you are on, sums it up, looks things up and translates; no agent.

Which runs on Windows, Veb or SigmaOS?

Neither. Veb runs on Mac; SigmaOS on Mac.

Do Veb and SigmaOS have phone apps?

On the phone, Veb: Veb for iPhone, in beta on TestFlight; syncs spaces, tabs, bookmarks, history and chats. SigmaOS has no phone app: Mac only. iOS has been on its roadmap since 2021.

Is SigmaOS still being updated?

Still downloadable, with no public release notes since version 1.19 in February 2025.

More comparisons

SigmaOS vs Arc SigmaOS vs Vivaldi SigmaOS vs Zen SigmaOS vs Orion SigmaOS vs Chrome SigmaOS vs Safari SigmaOS vs Edge SigmaOS alternatives

Sources. Read October 9, 2026. Something out of date? Write to hello@serafimlabs.io and we fix it.

Veb, Very Expensive Browser.

Free for the Mac. Arc’s sidebar, your own Claude or ChatGPT as the agent, Chrome extensions on WebKit.

it’s freeRelease status