Serein Download

Native macOS · Apple Silicon

Browse, delegate, stay in charge.

Serein is a native Mac browser and workspace for the coding agents already on your Mac. They work in visible tabs you can watch and take over, with only the access you grant.

Download for Mac See it work

macOS 14 or later · Apple Silicon

Works with Claude Code · Codex · Cursor Agent · OpenCode · Command Code · Grok · Hermes Agent · Pi

01 — The workspace

Start anywhere.

One omnibox opens addresses, searches and tasks. Today's projects and your tabs wait just below it.

Ask about any page.

⌥⌘E opens the task panel beside the page with your selection attached. The page keeps its full width, and the eye shows exactly what is sent.

Watch the agent work.

Web tasks run in visible agent tabs with an isolated cookie store. A pointer glides to each element before it acts. Take Over makes the tab yours.

02 — Agents

Every agent on your Mac, in one workspace.

Serein finds the CLIs you already have (Claude Code, Codex, Cursor Agent, OpenCode, Command Code, Grok, Hermes Agent and Pi) and gives each one action: Install, Sign in, Update or Ready. It runs the tool's own command in a terminal inside Serein and uses that CLI's account. It never asks for your password.

  • ⌘E opens the composer. Auto routes each request to Answer, Research, This page, Library or a project, and shows why.
  • Up to three tasks run at once, each in its own process group with its own capability.
  • Follow-ups resume the native Codex or Claude session.

03 — Grants

Agents get exactly what you grant.

Every run starts with a fixed set of permissions: read pages, click and type, your sign-ins, project edits and Mac actions. Clicks, typing and edits begin off. Stop revokes that task's browser capability at once.

  • Agents stop on password, card and code pages and hand the tab back to you.
  • Agent tabs use an isolated cookie store. “Use my sign-ins” is a per-task grant you can revoke.
  • Private windows and their tabs never reach agent context.

04 — Everything else

A real browser, built around the work.

Browse

An omnibox that ranks Open, Search, Task, tabs, history and saved pages. Vertical or horizontal tabs, groups and compare.

⌘T · ⌘L

Ask and point

Ask about the page with your selection attached, or point at up to three elements. You see exactly what will be sent.

⌥⌘E · ⇧⌘E

Review edits

Each turn's file changes are snapshotted in a private Git ref. Read the diff, then Undo this turn or Redo.

Allow once · Always · Deny

Journal

Your day as stretches on a time rail. Find a visit by describing it, with an on-device semantic index.

On-device

Passwords

Stored in this Mac's Keychain, filled only on the exact origin, never submitted for you.

Keychain

Hold to talk

Hold fn to dictate into a page, the omnibox or the composer with on-device Apple Speech.

fn

Download

Get Serein for Mac.

Download for Mac

macOS 14 or later · Apple Silicon

  1. 1
    Open the disk image and drag Serein to Applications.
  2. 2
    Allow the first launch. This build is not notarized yet, so macOS blocks it once. Open System Settings › Privacy & Security and choose Open Anyway. If that option doesn't appear, run xattr -dr com.apple.quarantine /Applications/Serein.app in Terminal.
  3. 3
    Connect an agent. Setup lists every agent CLI it finds and signs in through the tool itself.