Maintaining a macOS system often requires complex command-line interactions. OnyX simplifies this process, providing a graphical user interface (GUI) for a wide range of essential system maintenance and optimization tasks. This multifunction utility allows users to verify the startup disk structure and execute built-in maintenance scripts, which are crucial for long-term system health.
Beyond simple cleaning, the application offers deep customization. Users can configure numerous hidden parameters for core Apple applications like the Finder, Dock, and Safari, unlocking settings not available through standard System Preferences. Plus, the latest OnyX 4.9.5 version for macOS Tahoe 26 includes significant improvements to the application uninstaller and cache cleaning routines.
In This Post
OnyX Quick Start
Advanced Finder and Dock Customization
- Open OnyX and navigate to the Parameters section.
- Select the Finder tab to access hidden settings.
- Enable the option to Show/Hide hidden files immediately without using Terminal commands.
- Switch to the Dock tab.
- Adjust the setting to Change the spaces between icons to fine-tune the Dock’s appearance.
Why: These settings allow power users to quickly toggle visibility of system files and personalize the Dock’s layout, which is typically only possible by executing complex defaults write commands in the Terminal.
Changing Default Screen Capture Settings
- Go to the Parameters section in OnyX.
- Select the General tab.
- Locate the setting for Screen capture file format.
- Change the default format from PNG to a more compressed format like JPEG or a lossless format like TIFF.
- Use the Path to save screen captures option to set a specific folder, preventing desktop clutter.
Why: By changing the default file format, users can optimize storage space (JPEG) or ensure maximum quality (TIFF) for their screenshots. Redirecting the save path keeps the Desktop clean and organized, a common power-user preference.
System Specifications
Minimum
- OS: macOS Tahoe 26
- Processor: Intel-based Mac or Mac with Apple silicon
Product Specifications
| Software Name | OnyX |
|---|---|
| Version | 4.9.5 |
| License | Free |
| File Size | 8.4 MB |
| OS Support | macOS Tahoe 26, macOS Sequoia 15, macOS Sonoma 14, macOS Ventura 13, macOS Monterey 12, and earlier versions. |
| Language | English, French, Spanish, German (multi-language) |
| Developer | Titanium Software |
| Homepage | https://www.titanium-software.fr |
| Last Updated | February 2026 |
Benefits & Limitations
| Pros | Cons |
|---|---|
| Provides a GUI for complex UNIX maintenance commands. | Requires a specific version for each major macOS release. |
| Allows configuration of numerous hidden macOS parameters. | Advanced features may be confusing for novice users. |
| Free to use and regularly updated for new macOS versions. | |
| Includes a robust application uninstaller. |
Highlights
- System File Verification: The utility can verify the structure of the startup disk and its system files, ensuring integrity before performing any maintenance operations. This is a critical first step for system upkeep.
- Deep Cache and Log Cleaning: Users can delete system, application, and internet caches, along with various log files and problematic folders that accumulate over time. Cleaning these items helps to free up disk space and improve performance.
- Hidden Parameter Configuration: OnyX provides a centralized interface to configure hundreds of hidden settings for the Finder, Dock, Safari, and other Apple applications. This allows for extensive personalization of the user experience.
- Maintenance Script Execution: The software can execute the built-in UNIX maintenance scripts, which are typically run automatically by macOS but can be manually triggered for immediate system optimization. This is useful after major software installations.
- Database and Index Rebuilding: It includes tools to rebuild various system databases and indexes, such as the Launch Services database and Spotlight index, which can resolve issues with application icons and search functionality.
- Application Uninstaller: A dedicated uninstaller is included to remove applications and their associated files, ensuring a cleaner removal than simply dragging an app to the Trash. The latest version features improved uninstaller functionality.
Frequently Asked Questions
Is OnyX 4.9.5 free to download and use?
Yes, OnyX is released as Freeware by Titanium Software. You can download and use it for as long as you want without any cost.
Why are there different versions of OnyX for each macOS release?
The developer creates a specific version of OnyX for each major macOS release to ensure full compatibility and access to system-specific functions. You must use the version designed for your operating system.
What is the hidden parameters feature in OnyX?
This feature allows users to access and modify settings for core macOS components like the Finder and Dock that are not exposed in the standard System Settings application. These tweaks often require complex Terminal commands without OnyX.
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