OnyX
System maintenance and optimization utility
Install with Homebrew
brew install --cask onyx
OnyX — Official Website
Quick Take: OnyX
In August 2026 OnyX remains free, OS-matched Mac maintenance software for people who know what they are clicking. Use 5.0.2 on Tahoe, match builds to your OS, back up first, and skip daily cache-nuke rituals. Pay for CleanMyMac-class tools only if you want polish, schedules, and commercial support.
Best For
- •Power users comfortable with maintenance risks
- •Tahoe 26 owners wanting free deep utilities
- •Technicians removing stubborn app leftovers
- •Users avoiding subscription cleaners
What is OnyX?
OnyX is a long-running multifunction utility for macOS from Joël Barrière at Titanium Software. It first appeared in 2003 after OS X Jaguar and is still free donationware for maintenance, cleaning, verification, and hidden preference tweaks. This page is about Titanium Software OnyX on the Mac, not the unrelated Onyx AI product at onyx.app. As of August 2026 OnyX ships OS-matched builds. For macOS Tahoe 26 the current release is OnyX 5.0.2 (31 July 2026, about 7.8 MB) for Intel and Apple silicon Macs running Tahoe only. A separate OnyX 5.1.0 beta targets macOS Golden Gate 27 on Apple silicon. Older majors for Sequoia, Sonoma, and earlier still sit in the archive, but Titanium no longer actively develops those branches. Download the build that matches your macOS major version. There are no paid tiers. You can verify system structure, clear caches, uninstall apps more thoroughly than dragging to Trash, tweak Finder, Dock, and Safari defaults, and rebuild indexes. That same depth is the risk: aggressive cleaning can delete useful caches, and naive scans can misread Gatekeeper definition data. Take a Time Machine backup first. Treat OnyX as an occasional technician tool, not a daily boost ritual that modern macOS already handles for most people. Compared with subscription cleaners, OnyX trades hand-holding for transparency: every pane is a deliberate action you trigger. That design fits technicians and developers more than first-time Mac owners. If your only goal is to free a few gigabytes once, Storage settings and emptying Trash may be enough. If you need to rebuild Spotlight, purge stubborn app leftovers, or flip a Finder default Apple hid, OnyX 5.0.2 is still the free reference tool on Tahoe.
Key Features
Tahoe 26 Matched Build (5.0.2)
OnyX 5.0.2 is built for macOS Tahoe 26 on Intel and Apple Silicon (released 31 July 2026). Sequoia or older builds on Tahoe are unsupported. A Golden Gate 27 beta exists separately for Apple Silicon testers. The 7.8 MB download size keeps it light to archive on USB recovery kits. Golden Gate 27 beta 5.1.0 is only for testers on that OS; production fleets on Tahoe should stay on 5.0.2 until Titanium marks a stable Golden Gate build.
System Maintenance & Verification
Verify the structure of the startup disk and system files, then rebuild databases and indexes such as Spotlight when search misbehaves. Used sparingly after upgrades or odd behavior, this is a diagnostic step, not a daily chore. On Tahoe 26 with OnyX 5.0.2, run verification after OS upgrades when permissions or Spotlight feel wrong, not on a fixed calendar. Rebuild indexes only when search misses files you know exist. Verification can slow the machine while it walks the volume; schedule it when you can leave the Mac alone.
Deep Cleaning Operations
Clear system, user, application, and font caches plus logs and temporary items. Pick targets instead of wiping everything. Reclaiming gigabytes is possible; so is deleting caches macOS will just rebuild slowly. Prefer user and application caches first; leave system caches unless you are chasing a known corruption. Font caches and browser leftovers free space but may force apps to regenerate assets on next launch. Log cleanup helps disk pressure after verbose debug sessions. Measure free space before and after so you know whether the pass was worth it.
Parameter Customization
Expose hidden defaults in Finder, Dock, Safari, and other Apple apps that System Settings never shows: animation timing, screenshot format, and similar tweaks. Change only what you understand; these are preference flags, not a theme pack. Common power-user toggles include screenshot formats, Dock animation speed, and Finder visibility flags. Write down what you change so a future macOS upgrade does not leave you guessing. If a tweak breaks an app, reverse it in OnyX or wipe the related preference domain rather than reinstalling macOS.
Application Uninstallation
Find leftover preferences and support files after you remove an app from Applications. It is still a cleanup aid, not a full package manager with reverse dependency tracking. Creative apps scatter support files under Library containers; OnyX helps list those leftovers after you remove the .app bundle. Still review the list before delete: shared frameworks and license files can belong to other tools. For simple apps, AppCleaner may be enough; OnyX is for when you want a broader residual scan.
Utilities Access
Jump to Storage Management, Screen Sharing, Wireless Diagnostics, UNIX man pages, and visibility toggles for files, folders, and disks from one place. Handy when you do not want to hunt through System Settings for rarely used tools. Wireless Diagnostics and Screen Sharing are easy to forget in System Settings; OnyX surfaces them for field techs. Man-page access is a convenience for UNIX-adjacent tasks without opening Terminal first. Visibility toggles help when a disk or folder was hidden by a previous maintenance pass.
Secure File Deletion
Overwrite free space or deleted file regions so recovery tools have less to work with. Use it for sensitive material you truly need gone; ordinary Trash is enough for routine clutter. On SSDs with encryption, ordinary erase already limits recovery more than older spinning-disk myths suggested, but overwrite tools still appear in compliance checklists for some shops. Do not secure-erase free space on a failing drive; image and replace the hardware instead.
Who Should Use OnyX?
1The Everyday Mac User
A marketing professional on a MacBook Air (M3, macOS Tahoe 26) is low on disk after months of large project files and trial apps. They open OnyX Cleaning, clear selected system and application caches plus old logs, then run Maintenance to rebuild Spotlight. Search for client assets speeds up and a few gigabytes return. They do not schedule this daily; they run it when storage pressure is real. They record the OnyX 5.0.2 build and macOS version in the ticket so the next tech can reproduce the setup.
2The macOS Power User / Developer
A developer on a Mac Studio (M4 Ultra, macOS Tahoe 26) uses the Parameters pane instead of long defaults write commands. They shorten window animations, set screenshot format and save location for project assets, and force-quit stubborn helpers without hunting Activity Monitor. The point is faster day-to-day control, not a full system overhaul. They keep a short note of which Parameters changed, because defaults write archaeology is painful later.
3The IT Administrator / Mac Support Specialist
An IT admin troubleshooting iMacs (M2, macOS Sequoia 15) in a design studio hits one machine with crashes and slowdowns. They install the Sequoia-matched OnyX build, run Verification on the startup disk and system files, inspect logs under Utilities, and clean a corrupted cache set. The machine stabilizes without a reinstall. They still document every step because fleet machines are not personal toys. They attach before/after free-space screenshots so management sees the maintenance was measured, not ritual.
How to Install OnyX on Mac
Install OnyX from Titanium Software and match the build to your macOS major version. Each major OS gets its own OnyX release; the wrong DMG will not behave correctly.
Download the Correct Version
Open titanium-software.fr and download the OnyX build for your macOS. For Tahoe 26 use OnyX 5.0.2 (July 2026). Older pages may still list Sequoia and Sonoma builds; do not mix them.
Install the Application
Open the.dmg, drag OnyX into Applications, and confirm the Gatekeeper prompt if macOS asks about an app downloaded from the internet.
Grant Full Disk Access & Administrator Privileges
On first launch enter an administrator password. Then open System Settings > Privacy & Security > Full Disk Access, unlock, add OnyX, and enable it. Without Full Disk Access many cleaning and verification jobs simply fail.
Optional: Install via Homebrew Cask
If you already use Homebrew: brew install --cask onyx. You still grant Full Disk Access after install.
Pro Tips
- • Match OnyX version to the macOS major you are running.
- • Back up with Time Machine before large cleaning or parameter changes.
- • Full Disk Access is required for the deeper maintenance jobs.
- • Keep the Titanium DMG checksum or download date recorded for fleet imaging so every Mac gets the same OnyX 5.0.2 build.
- • After granting Full Disk Access, quit and relaunch OnyX once so permission checks refresh.
- • On managed Macs, deploy OnyX only to technician accounts rather than every user profile.
Configuration Tips
Always Backup Before Major Changes
Before large cleaning jobs or hidden-parameter edits, take a full Time Machine (or other) backup. OnyX is legitimate software, but it can still delete or alter system-adjacent data you did not mean to touch.
Understand Each Option Before Execution
Read the in-app description for every checkbox. If you cannot explain what a task does, leave it off. Blind multi-select cleaning is how people break a healthy Mac that only needed a reboot.
Grant Full Disk Access Promptly
Add OnyX under Full Disk Access before you judge the tool as broken. Without that permission, system cache and database rebuilds are blocked by macOS design.
Use the OS-matched build only
Tahoe 26 needs OnyX 5.0.2; Sequoia fleets need the Sequoia archive build. Mixing majors is the most common support failure. Bookmark titanium-software.fr and ignore third-party mirrors that bundle adware installers.
Pair with Maintenance for schedules
OnyX itself does not schedule weekly jobs. If you want recurring scripts, Titanium's Maintenance utility or a calendar reminder plus a short checklist is safer than inventing launchd jobs you will forget.
Alternatives to OnyX
Commercial cleaners and first-party tools cover overlapping maintenance jobs with different risk profiles. OnyX wins on free depth and hidden parameters; paid tools win on hand-holding and schedules.
CleanMyMac
Paid, polished cleaner with malware modules and schedules. Prefer for guided UX and support desks. OnyX wins when you want free depth and hidden parameters without a subscription.
Cocktail
Paid long-running Mac utility with scheduled scripts in a similar power-user niche. Choose Cocktail if you need automation timers; choose OnyX if you want free, OS-matched manual control.
Maintenance (Titanium)
Sibling free utility from the same developer focused on scheduled maintenance; complements OnyX.
AppCleaner
Focused free uninstaller without OnyX's broad tweak surface.
Disk Utility
Apple's built-in disk and First Aid tools. Start here for volume repair before third-party maintenance apps. OnyX adds cache cleaning and preference tweaks First Aid never covers.
Pricing
OnyX is completely free with no subscriptions, in-app purchases, or locked features. Titanium Software accepts optional donations. Download only the macOS-matched DMG from titanium-software.fr. There is no App Store SKU. You pay nothing for the binary; the real cost is time spent reading what each maintenance task does and restoring from backup if you over-clean. Optional donations support continued OS-matched releases such as 5.0.2 for Tahoe 26.
Pros
- ✓Free donationware with no subscriptions or locked modules
- ✓Wide maintenance, cleaning, and parameter toolkit in one app
- ✓Hidden macOS parameters and utility launchers System Settings omits
- ✓Dedicated build per major macOS version (Tahoe 5.0.2 in July 2026)
- ✓Active updates from Joël Barrière / Titanium Software
- ✓Straightforward layout once you know which pane you need
- ✓Can reclaim disk space and fix broken indexes when used carefully
- ✓No adware or upsells in the official build
- ✓Intel and Apple Silicon support on current Tahoe builds
- ✓Long track record of OS-matched releases since the early OS X era
- ✓Suitable for technician USB kits thanks to a small download footprint (~7.8 MB for 5.0.2)
Cons
- ✗Easy to misuse if you do not understand macOS internals
- ✗Option density intimidates absolute beginners
- ✗UI is functional rather than polished like paid cleaners
- ✗No built-in scheduled maintenance (use Maintenance or reminders)
- ✗Startup disk verification can slow the machine while it runs
- ✗Wrong-version builds are unsupported across macOS majors
- ✗Aggressive cleaning can hurt a healthy modern Mac
- ✗No commercial SLA; support depends on developer availability and community posts
- ✗Donationware funding model means no guaranteed roadmap for every Apple beta
Community & Support
OnyX is largely a one-developer project from Joël Barrière at Titanium Software. Support starts at titanium-software.fr: downloads, release notes, and contact details. There is no large official forum or busy public GitHub for the Mac utility; loyal users still trade tips on Mac enthusiast boards. In-app copy is usually clear enough for power users, and the developer has a long record of shipping a new build when Apple ships a new macOS. For August 2026 Mac evaluation: confirm the Tahoe 5.0.2 (or Golden Gate beta) build on the vendor site, prefer the OS-matched DMG over random mirrors, and back up before first deep clean. Social anecdotes about free cleaners should lose to release notes when they conflict. Compare OnyX to CleanMyMac or Cocktail only on jobs you actually run (cache cleanup, parameter tweaks, uninstall leftovers), not on marketing feature grids. Practical limits worth repeating: modern macOS already purges many caches; daily OnyX runs rarely help. Use Verification after upgrades when Spotlight or permissions feel wrong. Keep Full Disk Access granted only while you trust the binary. If you need scheduled maintenance, Titanium's sibling Maintenance app is the closer fit. If you need malware scanning with a support desk, buy a commercial suite instead of stretching OnyX past its role. When you evaluate OnyX against CleanMyMac in August 2026, price the jobs: cache cleanup, leftover uninstalls, hidden Finder defaults, and disk verification. OnyX 5.0.2 covers those without paywalls on Tahoe 26. CleanMyMac adds scheduling, malware modules, and a support desk at a subscription cost. Never mix a Sequoia-era OnyX build with Tahoe. After any major clean, reboot once and retest Spotlight, Mail, and your main creative apps before calling the job done. IT fleets should document which panes technicians may use; unrestricted parameter editing on shared Macs creates hard-to-debug drift. For onyx buyers in August 2026, re-check release notes after each macOS update and keep backups before major config changes. Historical context still matters for trust: OnyX has followed macOS major versions for two decades, which is longer than most free cleaner brands last. That longevity does not make every checkbox safe; it only means the developer ships OS-matched builds instead of abandoning the project after a redesign. When Apple ships Tahoe point updates, wait for Titanium release notes before assuming yesterday's cleaning preset still applies. Power users who document parameter changes recover faster after OS upgrades than users who click everything once and forget. Disambiguation remains a search problem in 2026: enterprise AI products using the Onyx name are unrelated. If a package manager or blog points you at a server AI stack, you are on the wrong product. The Mac utility lives at titanium-software.fr and Homebrew cask onyx for the UI maintenance tool only.
Video Tutorials
Getting Started with OnyX
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Frequently Asked Questions about OnyX
About the Author
Productivity & Workflow Analyst
Expert Tips for OnyX
Mac admins still keep OnyX on a USB key for offline cache and Spotlight rebuilds, but they stop recommending daily cleaners to non-technical staff.
Users who hit problems after OnyX almost always mixed an old OS build with a new macOS or wiped every cache category at once.
Titanium's cadence of shipping a Tahoe-matched 5.0.2 in July 2026 is the main reason people still trust the project over abandoned free cleaners.
Homebrew cask installs still require a manual Full Disk Access grant; automation that skips Privacy & Security leaves half the panes broken.
Design studios on Sequoia 15 should keep the Sequoia archive build even when marketing pages highlight Tahoe 5.0.2.
The Golden Gate 27 5.1.0 beta is useful for testers only; production imaging should wait for a stable listing on the Titanium site.
Related Technologies & Concepts
Sources & References
Fact-CheckedLast verified: Aug 9, 2026
Key Verified Facts
- OnyX 5.0.2 for macOS Tahoe 26 was released July 31, 2026 for Intel and Apple silicon.[cite-1]
- OnyX is freeware/donationware with no paid feature tiers.[cite-1, cite-2]
- Each major macOS version requires its own OnyX build.[cite-1]
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Research queries: OnyX 5.0.2 Tahoe; Titanium Software OnyX 2026