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macOS 11+Chromium

A calm window on the web.

Casement is a desktop browser built on Chromium — real tabs, an AI form-filler, a keychain-sealed password vault, and history that never leaves your Mac.

Casement for macOS

Version 1.7.1 · macOS 11+ · Free

Apple SiliconM1 · M2 · M3 · M4Intelx86_64 Macs
macOS
11 Big Sur or later
Chip
Apple Silicon or Intel
Memory
4 GB RAM minimum
Disk
115 MB download
Casement — New tab
casement.app
Go
RecallVaultPrivacyDownloads
Installation

Install Casement on macOS

Five steps, about a minute. Requires macOS 11 Big Sur or later.

  1. Download the right build

    Apple Silicon (arm64) for M1, M2, M3 and M4 Macs; Intel (x64) for older Macs. Not sure? Apple menu → About This Mac shows your chip.

  2. Open the download

    Double-click the .dmg to mount it, or the .zip to unpack it. Finder puts Casement.app in your Downloads folder.

  3. Drag Casement to Applications

    Drop Casement.app into the Applications folder — that is the entire install. No installer, no background services. Eject the disk image when you're done.

  4. Open it the first time

    macOS quarantines apps downloaded from the web, so the first launch may say Casement is “damaged”. It isn't. Use the button below to copy the one-line command that clears the flag, paste it into Terminal, then open Casement normally — or right-click the app → Open → Open.

    Unlock in one click

    Unzips to Unlock Casement.command — double-click it and it strips thecom.apple.quarantineflag from Casement, then opens the app. No Terminal typing.

    Install troubleshooting →

  5. Sign in to sync (optional)

    Open Casement → Settings → Account and sign in to sync bookmarks, history and your encrypted vault across your Macs. Skip it and everything stays local.

Inside the app

A browser made of quiet parts

Every tile below is a piece of the build you can download on this page.

One quiet strip of chrome

Tabs, omnibox, favorites and every tool in a single hairline bar — no ribbons, no sidebars you didn't ask for.

Keychain-sealed vault

Encrypted to this Mac, with a rules-based generator and passphrase-sealed backups.

Privacy you can see

Trackers, cookies, HTTPS-only, DNT/GPC and clear-on-quit — one pane, no dark patterns.

Downloads with real controls

Live speed, pause, resume, reveal in Finder — and a folder you pick.

WebGPU on by default

Three.js scenes, Vue and React apps run at native Chromium speed.

Assistant in the chrome

⇧⌘F reads the form in front of you and fills it — passwords never reach the model.

Why another browser

Same engine. Opposite priorities.

Casement renders with the same Chromium that Chrome and Edge use, so sites behave identically. What changes is everything wrapped around it.

The assistant is in the chrome, not a tab

⇧⌘F reads the form you're looking at and fills it. Chrome and Safari autofill from a saved profile; Casement reasons about unfamiliar fields — and never sends password values to the model.

Passwords sealed to your Keychain

The vault file is encrypted with macOS safeStorage, so a stolen copy won't open on another Mac. Sync is end-to-end encrypted under a passphrase we can't recover.

No account, no telemetry, no sign-in wall

Casement ships with zero analytics and no ad stack. History lives in Recall on your Mac; sync only starts when you decide to sign in.

Full modern-web stack, switched on

WebGPU, WebGL2, WASM and SharedArrayBuffer are enabled, so three.js scenes, Vue and React apps and heavy canvases run at native Chromium speed.

One window's worth of memory

No feed, no sidebar apps, no crypto wallet, no rewards program. The whole UI is a toolbar, a favorites strip and sheets that appear when you call them.

Updates you can verify

Each update is checked against a published SHA-256 digest and installed with an atomic swap — only after you press the button.

CapabilityCasementChromeSafari
AI form fill built into the toolbarYesNoNo
Page → markdown reader (Firecrawl)YesNoNo
Password vault sealed to the KeychainYesGoogle accountiCloud
End-to-end encrypted vault syncPassphraseOptionalYes
Telemetry / ad platformNoneYesLimited
Per-site AI + scraping policyYesNoNo
Verified SHA-256 update channelYesAutoSystem
WebGPU + WASM threads on by defaultYesYesPartial
Chrome extensions

Your uBlock, your Vue Devtools, your Bitwarden.

Casement runs Chromium's extension system directly, so MV2 and MV3 extensions load from a folder — content scripts, background service workers, chrome.storage, chrome.runtime messaging and devtools panels included.

  • Content scripts, service workers, storage, messaging and devtools panels.
  • Ad blockers, password managers, Vue and React devtools, Grammarly-style helpers.
  • No Chrome Web Store one-click install, and no chrome.tabs write APIs — load unpacked instead.
  1. 01

    Unzip or clone the extension

    Any Chrome extension folder with a manifest.json works — download the .crx and unzip it, or grab the source from GitHub.

  2. 02

    Settings › Extensions › Load unpacked

    Point Casement at the folder. It loads into the browsing session immediately and re-loads on every launch.

  3. 03

    It runs on every tab

    Content scripts, background service workers, storage and message passing run against Chromium's own extension APIs.

Engineered for quiet focus

AI form fill

Casement reads the form, maps your profile onto it and fills it — passwords stay out of the model.

Password vault

Encrypted with the macOS keychain, with a generator and passphrase-sealed backups.

Firecrawl reader

Pull any page down to clean markdown, and hand the assistant real page context.

Real tabs

Full Chromium tabs with favicons, titles and middle-click close.

Smart omnibox

Type a URL or a question — anything else falls through to search.

Recall

Every page you visit, searchable and clearable, stored only on your Mac.

Favorites bar

Star the current page to pin it; middle-click a pin to drop it.

Glass, light & dark

Frosted chrome and hairline edges over a quiet marine palette.

Latest web specs

WebGPU, WebGL2, WASM and SharedArrayBuffer on — Three.js scenes and Vue apps run at full speed.

History and favorites stay on your machine unless you turn on sync.

Master the keys

New tab
⌘T
Close tab
⌘W
Focus address bar
⌘L
Reload page
⌘R
Back / forward
⌘[ / ⌘]
AI-fill this form
⇧⌘F
Autofill password
⇧⌘A
Passwords
⇧⌘P
Recall history
⌘Y
Toggle theme
⇧⌘D
Page DevTools
⌥⌘I
What's new

Casement 1.7.1 for macOS

Released 14 August 2026Apple Silicon & Intel · 115 MBSHA-256 verified

  • Settings › Downloads lets you pick the folder Casement saves files to, reset back to the macOS Downloads folder, or open it.
  • New option to ask where to save each file instead of downloading straight to the folder.
  • Downloads with a name that already exists are numbered rather than overwritten, and an unavailable folder quietly falls back to Downloads.
  • Downloadable builds are now hosted directly, so the buttons on this site install the real app.
Get 1.7.1Full changelog →

Changelog

Checked every six hours, verified against SHA-256, installed only when you say so.

  1. Casement 1.7.12026-08-14
    • ·Settings › Downloads lets you pick the folder Casement saves files to, reset back to the macOS Downloads folder, or open it.
    • ·New option to ask where to save each file instead of downloading straight to the folder.
    • ·Downloads with a name that already exists are numbered rather than overwritten, and an unavailable folder quietly falls back to Downloads.
    • ·Downloadable builds are now hosted directly, so the buttons on this site install the real app.
  2. Casement 1.7.02026-08-14
    • ·The password generator now has real rules: a length slider up to 128, per-set switches for a–z, A–Z, 0–9 and symbols, your own symbol list, characters to exclude, look-alike skipping and no-repeat mode.
    • ·A live strength meter shows the entropy your rules actually produce.
    • ·One click inserts a fresh password straight into the field you last used on the page — confirmation fields included — and copies it at the same time.
    • ·Your generator rules are remembered between launches.
  3. Casement 1.6.12026-08-14
    • ·Casement now checks for updates on its own — every few hours, on wake from sleep and when you come back to the window.
    • ·A quiet prompt appears above the page when a new build is ready, with release notes and a one-click install.
    • ·"Later" holds a non-critical update for a day; security releases stay visible until installed.
    • ·Settings › Updates shows the Chromium version behind Casement and when it last checked.
  4. Casement 1.6.02026-08-14
    • ·Sealed vault backups: export every saved login to a single file encrypted with a passphrase you choose.
    • ·Restore on any Mac — pick a backup and Casement shows the sites and entry count before you unlock it.
    • ·Merge or replace on restore, with a preview that shows exactly what will change before anything is written.
    • ·CSV import from Chrome, Safari, 1Password and Bitwarden, plus a clearly-labelled plaintext CSV export.
  5. Casement 1.5.02026-08-14
    • ·Casement can now update itself: verified downloads, release notes and a one-click install.
    • ·Updates are checked every six hours, downloaded in the background and pinned to a SHA-256 checksum.
    • ·New Updates pane in Settings with channel, auto-check and auto-download controls.
    • ·The previous version is kept on disk until the new build launches cleanly.
  6. Casement 1.4.02026-08-14
    • ·Full settings page: privacy controls, proxy and secure DNS, per-site permissions and theme behaviour.
    • ·Tracker blocking, third-party cookie blocking, HTTPS-only mode and Do Not Track.
    • ·Granular clear-browsing-data, including a clear-on-quit option.
  7. Casement 1.3.02026-08-13
    • ·Built-in download manager with progress, speed, ETA, pause/resume and Show in Finder.
    • ·Downloads persist across launches and the panel opens automatically on a new transfer.