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pen.dev

An agent-assisted design canvas with editable website and Figma imports, reusable components, vector tools, and HTML export.

CaskDesignAuto-updatesApple silicon · Intel
Homepage
From homebrew/cask
30-day installs
21
#1533 in App
1-year installs
21
Last 365 days
Latest version
1.2.20
Download size
465MB
arm64 / x86_64 · dmg
Release cadence
Daily
2 releases in 30 days

pen.dev is a Design app for Mac.

Quick facts

Chips
Apple silicon · Intel
macOS
macOS 13 or later
Price
Free with in-app purchases
Install
brew install --cask pen
Homebrew
Available; the app updates itself
Also known as
Pen, pen

These facts were checked on or after . See each source

About

pen.dev is a design canvas for creating interfaces and visual assets with AI agents, then refining them manually.

• Work with agents directly on the canvas, connect external agents through MCP, or design headlessly with the pen.dev CLI. • Import webpages as editable layers through the built-in browser, and import .fig files or paste content from Figma. • Build reusable components and shared UI libraries, with variables and flex layouts. • Edit vector paths, gradients, masks and image effects, and turn bitmap images into editable vectors. • Export frames as HTML and CSS/Tailwind, PDF, PNG, JPEG or WEBP, and share designs by link.

For designers and developers creating websites, mobile app interfaces and marketing visuals. The open .pen design format uses JSON. Model connections can use a ChatGPT or Claude subscription, API keys, MCP, WebMCP or CLI.

Homebrew compatibility: macOS 13 or later on Apple Silicon and Intel Macs; Rosetta is not required.

Install: brew install --cask pen Official website: https://www.pen.dev/

System requirements

macOSVersionChipsDownloadSource
macOS 13 or later1.2.20Intelgithub.com/highagency/pen-desktop-releases/releases/download/v1.2.20/Pen-1.2.20-mac-x64.dmgSHA-256 3259823c592d812a24e279be42537b26099ae43d7f3ec7ddc90407689bffaa74HomebrewChecked
macOS 13 or later1.2.20Apple silicongithub.com/highagency/pen-desktop-releases/releases/download/v1.2.20/Pen-1.2.20-mac-arm64.dmgSHA-256 acea8ed21e442720364506db230e319e35a7dc6a3e0af7463c2025a3dafbf24cHomebrewChecked

How to install pen.dev on Mac

  1. In Terminal, run: brew install --cask pen
  2. Homebrew installs the app in your Applications folder.

Install without Homebrew

Download the file Homebrew uses for your chip: Apple siliconIntel

SHA-256 only checks that the download is complete; it is not a security certification. See the SHA-256 and download address

Uninstall pen.dev and optional data cleanup

Uninstall command
brew uninstall --cask pen

A regular uninstall removes the app and keeps its settings and caches.

Deep clean (optional)

Uninstall command
brew uninstall --zap --cask pen

--zap also deletes the settings, caches and other files listed in the Homebrew definition. They can include data shared with other apps and cannot be restored, and it does not guarantee that nothing is left. Back up any data you need first. To keep settings and caches, leave out --zap.

Files pen.dev can leave on your Mac (6)
Files and folders
~/.pencil
~/Library/Application Support/com.apple.sharedfilelist/com.apple.LSSharedFileList.ApplicationRecentDocuments/dev.pencil.desktop.sfl*
~/Library/Application Support/Pen
~/Library/Caches/pen-updater
~/Library/Logs/Pen
~/Library/Preferences/dev.pencil.desktop.plist

These entries come from the Homebrew definition, checked . They say what it declares, not what is on your Mac.

pen.dev security facts

Only facts that can be checked, each with its source and date. This is not a safety certification. To check the files you downloaded, scan them on your Mac with OpenNavo.

Distribution
Homebrew
Scan with OpenNavoOpens a scan preview in the OpenNavo app; you decide whether to start it. ClamAV on Mac

Install Details

Tap
homebrew/cask
Download URL
https://github.com/highagency/pen-desktop-releases/releases/download/v1.2.20/Pen-1.2.20-mac-arm64.dmg
SHA-256
acea8ed21e442720364506db230e319e35a7dc6a3e0af7463c2025a3dafbf24c
Homebrew definition
github.com/homebrew/homebrew-cask/blob/HEAD/Casks/p/pen.rb
formulae.brew.sh
formulae.brew.sh/cask/pen

Installation and removal contents

  • Install app

    Source file: Pen.app

    Declared destination: /Applications/Pen.app

    View full declaration
    {
  "app": [
    "Pen.app"
  ],
  "target": "/Applications/Pen.app"
}

  • Remove user data zap

    View full declaration
    {
  "zap": [
    {
      "trash": [
        "~/.pencil",
        "~/Library/Application Support/com.apple.sharedfilelist/com.apple.LSSharedFileList.ApplicationRecentDocuments/dev.pencil.desktop.sfl*",
        "~/Library/Application Support/Pen",
        "~/Library/Caches/pen-updater",
        "~/Library/Logs/Pen",
        "~/Library/Preferences/dev.pencil.desktop.plist"
      ]
    }
  ]
}

Questions about pen.dev

Is pen.dev safe?

pen.dev is in Homebrew’s official catalog and has not been disabled. Since September 2026, Homebrew disables apps that fail macOS Gatekeeper checks. When installing, Homebrew checks the download from github.com against its SHA-256 checksum. It was installed 21 times through Homebrew in the last 30 days.

Is pen.dev free?

pen.dev is free to download and offers in-app purchases. Source: www.pen.dev/pricing, checked Oct 25, 2026.

How do I completely uninstall pen.dev on a Mac?

Run brew uninstall --cask pen. To delete its settings and caches as well, run brew uninstall --zap --cask pen. --zap also deletes the settings, caches and other files listed in the Homebrew definition. They can include data shared with other apps and cannot be restored, and it does not guarantee that nothing is left. Back up any data you need first. To keep settings and caches, leave out --zap. That also deletes 6 files and folders, including ~/.pencil.

Does pen.dev run on Apple silicon (M1 and later) Macs?

Yes. Homebrew downloads separate builds for Apple silicon and Intel Macs. It needs macOS 13 or later.

Where does pen.dev store its settings and data?

Its settings are in ~/Library/Preferences/dev.pencil.desktop.plist. Its data is in ~/.pencil and ~/Library/Application Support/Pen. These locations come from Homebrew’s clean-up list.

What is the latest version of pen.dev?

The latest version is 1.2.20, added to Homebrew on Oct 24, 2026. pen.dev updates itself; to update it with Homebrew, run brew upgrade --cask --greedy pen.

Sources

Every fact on this page names its source and check date. Facts past their validity read “as of” their date and are no longer stated as current.