Deeper is a free macOS preference utility from Titanium Software that surfaces and toggles hidden system and application settings Apple never put in System Settings — the same settings power users have long hunted for in Terminal.
What is Deeper?
Deeper is a Mac system-tweaking tool that gives you a clean GUI for activating and deactivating features buried inside macOS defaults, Finder, the Dock, Safari, and other first-party apps. Rather than memorising arcane defaults write commands or pasting scripts you found on a forum at midnight, you flip a toggle and move on. That's the entire pitch — and after using it daily for several weeks, I'd say it delivers exactly that, without drama.
Titanium Software, the same team behind OnyX (the more famous sibling in this family), has kept Deeper updated across every major macOS release, which is rarer than it sounds for a free system utility. Each release ships a version matched to that specific macOS build — don't mix them up, the app makes this obvious.
What does Deeper do best?
Deeper excels at one thing: making obscure macOS knobs accessible without Terminal. The toggles are organised into sensible panels — Finder, Dock, Dashboard (historical), Applications, and a handful of network and interface options. You tick a box, optionally relaunch the affected app, and the change is live.
My most-reached-for settings are the ones that de-clutter Finder: suppressing the .DS_Store file spray on network volumes, controlling sidebar icon sizing, and adjusting scroll behaviour. None of these are accessible in System Settings; all of them are a single click in Deeper. I've also used it to tweak Safari's debug menu visibility and to adjust how Dock animations behave — small things that compound into a noticeably snappier daily workflow.
What I appreciate most is the absence of scope creep. Deeper doesn't try to clean your disk, scan for malware, or recommend paid upgrades. It does one class of thing and stays out of your way.
How much does Deeper cost?
Deeper is free to download directly from Titanium Software's website. There's no freemium tier, no subscription nag, and no feature wall. The developer accepts donations, which I'd encourage given the years of maintenance behind this tool, but nothing is paywalled.
Who should use Deeper?
Deeper is for the Mac power user who knows what they want to change but doesn't want to maintain a personal shell script of defaults write incantations. If you've ever copy-pasted a Terminal tweak from Stack Overflow and then forgot what it did six months later, Deeper is the safer, more transparent alternative — every toggle is labelled in plain language.
It is not aimed at newcomers who just want their Mac to look nicer. The settings it exposes assume you understand what Finder's path bar is, what the .DS_Store file does, or why you might want to disable smooth scrolling. The app trusts you, which is exactly what I want from a utility like this — no hand-holding, no confirmation dialogs for every change.
If you're already comfortable in Terminal and have your tweak scripts memorised, Deeper probably won't change your life. But if you set up a new Mac every year or two and hate rebuilding that mental library, having these options in a GUI you can audit visually is genuinely useful.
What are the best Deeper alternatives?
The closest alternative is OnyX — also from Titanium Software — which covers similar hidden-settings territory but adds maintenance tasks like cache clearing, script execution, and rebuild operations. If you want tweaks and cleaning in one tool, OnyX is the obvious pick. Deeper is the minimal, tweak-only version for people who don't want a maintenance suite.
TinkerTool by Marcel Bresink occupies almost identical territory: free, GUI-based, macOS-version-matched, zero bloat. I've used both side-by-side; TinkerTool's panel layout feels slightly more logical to me, but Deeper has broader Finder-specific coverage. Either is a valid choice and it's worth having both installed since their setting sets don't overlap perfectly.
For deep system inspection rather than simple toggles, System Toolkit Pro and Prefs Editor go further — but they demand more confidence, since you're editing raw property lists rather than flipping labelled switches.
How does Deeper compare to TinkerTool?
Both are free, both are regularly updated for new macOS versions, and both expose hidden defaults through a clean native UI. Deeper leans slightly heavier on Finder and network volume behaviour; TinkerTool has stronger coverage of font smoothing, Exposé, and login window options. I keep both in my Applications folder and reach for whichever has the toggle I need at the moment — they're complementary rather than competitive.
