Design
Build a DMG window that tells customers what to do the moment they open it.
The last mile of
your Mac release.
Turn a finished app into a release people trust. Design the installer, prepare signing and notarization, then inspect exactly what you are about to ship.
macOS 15 or later · One-time purchase on Gumroad
Native Mac appSigning & notarizationSparkle 2 appcastsFree InspectorLifetime license
How it works
From app bundle to confident download.
Sign & notarize
Signing, notarization, stapling and export settings in a single release flow.
Inspect
Check package structure and trust details before the download is public.
Ship
Export the DMG and your Sparkle appcast, ready to upload.
CLIKit · Free
Ship from Terminal.
CLIKit is a separate command-line app that signs, notarizes and staples your Mac app, then packages it as a DMG or PKG. It uses the same engine as DMGKit, so the result looks exactly like a DMGKit export.
- One command.
clikit startbuilds, signs, notarizes and staples a release. - DMG or PKG. Choose the format with a single option.
- Your DMGKit designs. Drop a Designer template in the release folder and CLIKit uses it.
- Automation and CI. Run it in scripts and build pipelines.
Kit · On-device AI
Ask Kit what happened.
Kit is an AI assistant built into DMGKit. It reads your logs, explains why something failed and helps you find your way around the app.
On-device
Runs on Apple Intelligence, or on Qwen when Apple Intelligence is turned off.
Understands your logs
Ask about an export and get each step in plain language.
Explains failures
Find out why a step failed and what to check next.
Finds your way
Ask where a setting lives or how to do something in DMGKit.
Built-in Inspector
Check the release before it leaves.
DMGKit now includes the Inspector. Open any DMG or package and get a trust score with every check grouped and explained.
- File. Accessibility, size, SHA-256 and quarantine attribute.
- Contents. Mountability, app bundle, version, minimum macOS and architectures.
- Signing. DMG and app signatures, developer, Team ID, secure timestamp and Hardened Runtime.
- Gatekeeper & notarization. Notarization, Gatekeeper assessment and stapled tickets.
Installer design
Give your app a proper arrival.
Build a familiar, intentional installer window. Place your app, the Applications shortcut, artwork and guidance exactly where you want them.
- Designer. A background and sticker composer with linear, radial, angular and solid fills.
- Your artwork. Import images or a .zip sticker pack and arrange them on the canvas.
- Layout controls. App icon, Applications shortcut, arrows, overlays and window size.
- Templates. Save a design and reuse it on the next release.
Notarization
Keep Apple’s release path in view.
Set up your identities once. DMGKit keeps signing, notarization and stapling connected to the release you are making.
- Developer ID Application. Used for signing app bundles and DMG files.
- Developer ID Installer. Used only when you sign .pkg files.
- Notarytool keychain profile. Store the profile name once; DMGKit copies the Terminal command you need to create it.
- Stapled and verified. The ticket travels with your DMG.
Legal documents
Include the details that travel with your app.
Manage Terms, Privacy Policy, EULA and installer agreements from the same workspace.
- Rich text editor. Font, size, bold, italic, underline, lists and alignment.
- Per language. Write the agreement users accept before continuing, in each language you support.
Sparkle 2
Generate the appcast with the release.
Store an app profile and let DMGKit generate the appcast.xml during export, so updates go out with the same build you just packaged.
And everything else a release needs.
Templates
Save a layout once and reuse it for every release.
Window size
Set the exact installer window dimensions.
Volume name & icon
Name the mounted disk and give it your icon.
Format & compression
Choose the DMG format and compression level.
Architectures
Pick Release configuration and Universal builds.
Stickers & media
Import images or a .zip pack to use as stickers.
Gradients
Linear, radial, angular or solid backgrounds.
.pkg signing
Sign installer packages with Developer ID Installer.
Languages
Write legal agreements per language.
Appcast export
appcast.xml generated as part of export.
Works with the Mac apps you already build
SwiftUIPythonElectronTauri
DMGKit Inspector · Free
Free checks before a file leaves your hands.
Drop in a DMG or package and get a trust score with signing, notarization and file details, so you know what customers will see before they see it.
Your app is finished.
The release still needs work.
Direct distribution asks you to do more than export a build. You have to make installation clear, navigate Apple's trust requirements, and send a file you feel good about putting in front of customers.
Pricing
Three apps. One price.
DMGKit is a one-time purchase. CLIKit and DMGKit Inspector are free.
$0free
Check any DMG or package before you ship it.
Download Inspector- Trust score
- Signing and notarization checks
- File accessibility and size
- DMG and .pkg support
$24.99one time
Everything you need to design a DMG, prepare a direct release, and make the last mile feel considered.
Get DMGKit on GumroadGet it on Setapp- Visual DMG designer
- Signing and notarization workflow
- Reusable templates and export tools
- Legal document workflow
- Sparkle 2 appcast generation
$0free
Sign, notarize, staple and package your Mac app from Terminal, scripts and CI.
Download CLIKit- One command release
- DMG or PKG output
- Uses your DMGKit templates
- JSON output and exit codes for CI
DMGKit is sold and delivered through Gumroad. Prices in USD. Taxes may apply.
Questions, answered.
Who is DMGKit for?+
DMGKit is for Mac developers shipping direct downloads outside the Mac App Store who want a more visual, repeatable release workflow.
Where do I buy and download DMGKit?+
DMGKit is sold and distributed only through Gumroad at buy.dmgkit.app. After purchase, your download is available from your Gumroad receipt and library.
Is it a subscription?+
No. DMGKit is a one-time purchase of $24.99 USD for a lifetime license.
Do I need an Apple Developer account?+
You can design an installer without one. Signing and notarization require valid Apple Developer credentials, certificates, and the appropriate signing identity.
Can I make a PKG instead of a DMG?+
Yes. Use the DMG / PKG switch on the home screen. DMGKit adds your license agreement and can sign, notarize and staple the package.
Can I use DMGKit with Python, Electron, or Tauri?+
DMGKit is designed for modern macOS app bundles from native and common cross-platform development stacks.
Do I need Inspector if I have DMGKit?+
No. DMGKit includes the same checks on its Reports screen, plus Kit to explain them.
Which Macs are supported?+
DMGKit runs on macOS 15 and later.
What is CLIKit?+
A free command-line tool built on the same engine as DMGKit. It signs, builds the DMG or PKG, notarizes, staples and checks your release from Terminal, scripts and CI.
Is CLIKit free?+
Yes. CLIKit is free.
Do I need DMGKit to use CLIKit?+
No. CLIKit works on its own and builds DMGs in the standard DMGKit style. You only need DMGKit to design custom backgrounds (templates) or to install CLIKit from its Settings.
How do I install CLIKit?+
Launch DMGKit and go to Settings > CLIKit, or download it directly from https://dmgkit.app/CLIKit/CLIKit.dmg.
Can I use CLIKit in CI?+
Yes. CLIKit works over SSH and on build machines without Finder or a logged-in desktop, with stable exit codes and --json output.
Can CLIKit make a PKG?+
Yes. Add --format pkg to clikit start.
Where are my credentials stored?+
In your macOS keychain as a notarytool keychain profile, or in an App Store Connect API key file you keep. CLIKit never stores passwords.
Which Macs are supported?+
CLIKit runs on macOS 14.6 and later.
What does DMGKit Inspector do?+
It tells you whether a DMG or PKG can be trusted before you open it: who signed it, whether Apple notarized it, whether Gatekeeper accepts it and, for packages, whether it runs installer scripts with risky commands. You get a trust score with every check explained.
Is DMGKit Inspector free?+
Yes. DMGKit Inspector is free.
Do I need to be a developer?+
No. Inspector is for anyone who downloads software, as well as developers checking their own releases.
Does Inspector change my file?+
No. Inspector never changes the file you check.
Can Inspector promise a file is safe?+
No tool can promise a file is harmless. Inspector shows you the evidence Apple’s own tools report.
Which Macs are supported?+
DMGKit Inspector runs on macOS 14.6 and later.
Make the download
feel like your app.
macOS 15 or later · One-time purchase on Gumroad