Technical Specifications
A detailed breakdown of every feature available in Gravity DMG.
Visual DMG Editor
| Feature | Status | Description |
|---|---|---|
| Drag & Drop Simplicity | Easily place your Application and background image. | |
| Asset Library | Includes a built-in library of premium, space-themed background presets (Cosmic, Golden, Black Hole, etc.) to instantly give your installer a professional look. | |
| WYSIWYG Layout | What you see is exactly what your users will get upon mounting the image. |
Drag & Drop Simplicity
Easily place your Application and background image.
Asset Library
Includes a built-in library of premium, space-themed background presets (Cosmic, Golden, Black Hole, etc.) to instantly give your installer a professional look.
WYSIWYG Layout
What you see is exactly what your users will get upon mounting the image.
End-to-End Signing Pipeline
| Feature | Status | Description |
|---|---|---|
| App Bundle Signing | Automatically signs your .app bundle with your Developer ID. | |
| Hardened Runtime | Enables the Hardened Runtime (--options runtime) required for notarization. | |
| Entitlements Handling | Preserves existing entitlements while securing the binary. | |
| Pre-Flight Inspection | Inspects your app before building to detect signing issues early. |
App Bundle Signing
Automatically signs your .app bundle with your Developer ID.
Hardened Runtime
Enables the Hardened Runtime (--options runtime) required for notarization.
Entitlements Handling
Preserves existing entitlements while securing the binary.
Pre-Flight Inspection
Inspects your app before building to detect signing issues early.
Automated Notarization
| Feature | Status | Description |
|---|---|---|
| Apple Notary Service Integration | Uses the modern notarytool for fast, reliable notarization. | |
| Keychain Integration | Securely stores your App-Specific Passwords and Notary Profiles in the system Keychain—never in plain text. | |
| Credential Verification | "Verify with History" feature ensures your credentials are working before you start a build. |
Apple Notary Service Integration
Uses the modern notarytool for fast, reliable notarization.
Keychain Integration
Securely stores your App-Specific Passwords and Notary Profiles in the system Keychain—never in plain text.
Credential Verification
"Verify with History" feature ensures your credentials are working before you start a build.
Smart Build Workflow
| Feature | Status | Description |
|---|---|---|
| Custom Naming Templates | Define output filenames using variables like ${APP_NAME}, ${VERSION}, and ${DATE}. | |
| UDZO (Standard) Compression | Best balance of size and compatibility (Zlib). | |
| ULFO (Fast) Compression | Rapid compression for development builds (Lzfse). | |
| UDBZ (Max) Compression | Minimum file size for final distribution (Bzip2). | |
| Parallel Processing | Signs and builds efficiently. |
Custom Naming Templates
Define output filenames using variables like ${APP_NAME}, ${VERSION}, and ${DATE}.
UDZO (Standard) Compression
Best balance of size and compatibility (Zlib).
ULFO (Fast) Compression
Rapid compression for development builds (Lzfse).
UDBZ (Max) Compression
Minimum file size for final distribution (Bzip2).
Parallel Processing
Signs and builds efficiently.
Security First
| Feature | Status | Description |
|---|---|---|
| System Keychain Storage | All sensitive keys (Developer ID, Notary Credentials, License Keys) are stored in the macOS Keychain. | |
| Tamper Protection | Built-in integrity checks for the build environment. |
System Keychain Storage
All sensitive keys (Developer ID, Notary Credentials, License Keys) are stored in the macOS Keychain.
Tamper Protection
Built-in integrity checks for the build environment.
Platform Support
macOS Compatibility
macOS 13.0 (Ventura) and later
Optimized for Apple Silicon (M1/M2/M3)
Intel Mac Support
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