The short answer. OnyX is the old hand of this category: verification, maintenance scripts, cache rebuilding and access to hidden settings, with no cleanup theatre. Sensei adds hardware diagnostics and performance monitoring to the same job. Mole is the native all-in-one — cleanup, app management, disk analysis and monitoring in one window. Cleaner One, Mac Cache Cleaner and MacOSCleaner are the cleanup-first tools, and PureMac is the open-source one with no telemetry. The dividing question is whether you are trying to fix something or to tidy something, because maintenance utilities repair state and cleaners remove bytes, and the two have been sold together for so long that the distinction has been lost.
This guide covers 7 system maintenance apps for macOS. Every fact below is drawn from the same verified records that back each app’s own page. The recommendations are our editorial judgment, not payment. Last verified 2026-10-05.
Quick comparison
| App | What it is | Pricing | Licence | Version |
|---|---|---|---|---|
| Cleaner One | disk cleaner | Free | not published | 6.6.8 |
| Mac Cache Cleaner | Mac cleaner | Open source | MIT | 1.2 |
| MacOSCleaner | Mac cleaner | Open source | not published | 2.3.0 |
| Mole | Mac cleaner | not published | not published | 1.16.0 |
| OnyX | system maintenance utility | Free | Donationware (freeware); may be copied and distributed at no charge, but not modified for distribution | 5.1.0 |
| PureMac | Mac cleaner | Open source | MIT | 3.0.0 |
| Sensei | system tool | not published | not published | 2.1.3 |
What actually decides this
- Repair or removal. Rebuilding a cache, verifying a volume and resetting a preference are repairs. Deleting files is removal. A tool that does both is convenient and also the reason people cannot tell which action fixed their problem.
- Whether it shows the plan before acting. The single most useful property in this category is a list of what will be deleted, shown before anything is deleted. A maintenance tool that acts on a summary count is asking for trust it has not earned.
- What the deletion path is. Moving to the Trash and unlinking a file are different promises. Several of these tools are explicit that their only deletion path is the Trash, which is the property that makes an aggressive cleaner safe to try.
- Whether it needs elevated privileges for the interesting parts. System caches, launch daemons and permission repairs live behind authorisation. A tool that never asks for a password is either not touching system state or not telling you what it touches.
- How it behaves on the next OS release. Maintenance tools depend on undocumented locations and private interfaces. The ones that survive a major release are the ones that fail loudly rather than silently skipping a step.
- What it reports afterwards. A number of gigabytes reclaimed is a marketing figure unless the tool also lists the paths. The report is the part you would use to decide whether to run it again.
Our picks
- OnyX — Its record describes a system maintenance utility for cleanup, verification and hidden settings, which is the repair case. Choose it when something in the system is broken and you need the repair tools.
- Sensei — Its record describes a performance toolkit for monitoring, cleanup and hardware diagnostics, which is the diagnose-first case. Choose it when you want diagnostics and monitoring alongside maintenance.
- Mole — Its record describes a native maintenance utility covering cleanup, app management, disk analysis and monitoring, which is the all-in-one case. Choose it when you want one native window for cleanup, app management and disk analysis.
- PureMac — Its record describes a free, open-source cleaner with no telemetry, which is the auditability case. Choose it when the tool has to be open source and send nothing anywhere.
The apps
Cleaner One
Cleaner One is a disk cleaner for macOS. Disk cleaning and Mac optimization. It is free.
Cleaner One is listed with current version 6.6.8.
Full profile and verified facts for Cleaner One →
Mac Cache Cleaner
Mac Cache Cleaner is a Mac cleaner for macOS. Cache cleaner for Mac. It is released under MIT.
What it does. Mac cache cleaner.
Mac Cache Cleaner is listed with current version 1.2.
Full profile and verified facts for Mac Cache Cleaner →
MacOSCleaner
MacOSCleaner is a Mac cleaner for macOS. Free, open-source macOS cleaner with disk analyzer, app uninstaller, and smart cleanup. It is open source.
MacOSCleaner is listed with current version 2.3.0.
Full profile and verified facts for MacOSCleaner →
Mole
Mole is a Mac cleaner for macOS. Native Mac maintenance utility for cleanup, app management, disk analysis, and system monitoring. Its pricing is not published.
What it does. Mole is a native Mac app for cleaning caches and AI tool data, uninstalling and updating apps, analyzing disk space, and checking system status. Pay once, get free updates.
Mole is listed with current version 1.16.0.
Full profile and verified facts for Mole →
OnyX
OnyX is a system maintenance utility for macOS. System maintenance utility for cleanup, verification, and hidden settings. It is released under Donationware (freeware); may be copied and distributed at no charge, but not modified for distribution. It is free.
Strengths. Free donationware: no registration and no paid tier, and it may be used, copied and distributed at no charge. According to the developer, puts a clean interface over maintenance tasks that would otherwise require command-line commands, such as verifying system files and rebuilding databases and indexes. A specific build is published for each major macOS version, and older builds remain downloadable for older systems.
Trade-offs. Because each build targets one major macOS version, you must download the one matching your system; Titanium Software warns not to use a version intended for an earlier operating system, and it has discontinued developing the old versions. The current release 5.1.0 requires an Apple-silicon Mac, so Intel Macs are limited to older builds — the newest Intel-capable build is 5.0.6 for macOS Tahoe 26. Older builds remain downloadable but are no longer developed or updated. It only opens from an administrator account.
Not for. Intel Mac users on the newest macOS — the current release requires an Apple-silicon Mac. Anyone who wants an automated cleaner that decides what to remove for them. Users who want a disk-usage visualiser rather than a maintenance tool.
What it does. Verification of the structure of system files. Cleaning of caches and removal of problematic folders and files. Rebuilding of databases and indexes. Maintenance tasks and system cleanup.
OnyX is listed with current version 5.1.0.
Full profile and verified facts for OnyX →
PureMac
PureMac is a Mac cleaner for macOS. Free, open-source macOS cleaner with no telemetry. Cleans system and user caches, Xcode junk, Homebrew cache, mail attachments, and finds large or old files. Supports scheduled auto-cleaning. It is released under MIT.
PureMac is listed with current version 3.0.0.
Full profile and verified facts for PureMac →
Sensei
Sensei is a system tool for macOS. Performance toolkit for monitoring, cleanup, and hardware diagnostics. Its pricing is not published.
What it does. Monitor CPU, GPU, and storage, clean junk files, check battery health, and keep your Mac fast with Sensei. Free download.
Sensei is listed with current version 2.1.3.
Full profile and verified facts for Sensei →
How to choose
- Free of charge. Cleaner One and OnyX — no payment is required.
- No licence fee, source available. Mac Cache Cleaner, MacOSCleaner and PureMac — the source can be read and, under the terms of each licence, reused.
- Pricing not published in our data. Mole and Sensei — check the developer’s own site before assuming anything about cost.
Open source: Mac Cache Cleaner, MacOSCleaner and PureMac (3 of 7).
Common mistakes
- Running a cleaner to fix a performance problem. Reclaimed bytes rarely change how fast anything runs.
- Letting a tool delete system caches without reading the list, then wondering why an app forgot its settings.
- Installing three maintenance utilities. They overlap, they disagree, and the second one often undoes the first.
- Treating a green check mark as a diagnosis. Verification reports what it checked, not what it missed.
How this guide was put together
Each app’s facts come from its own record: the developer’s own pages and repository, the App Store listing where one exists, and the documentation, each with a source grade and an access date. Where a fact rests on the developer’s own statement rather than on something we verified independently, the sentence says so. Where our data has no value for something, the guide says “not published” instead of guessing.
A price appears here only where the record carries one from a stated source; the guide never estimates one, and it records the pricing model alongside so the two can be read together. Prices change and vary by region, so each app links to its own page for the current detail.
The facts and the recommendations are kept apart on purpose. Everything in the app entries, the comparison table and the answers above is composed from the records. The short answer, the criteria and the picks are our editorial judgment: they reflect what we would choose and why, and they are not paid for. Where we make a recommendation we name the condition it applies under, because we do not call anything “the best” without explaining the criteria.
Verified 2026-10-05.
Frequently Asked Questions
How do I choose between these system maintenance apps?
There is no single answer — it depends on what you need. This guide covers 7 system maintenance apps: Cleaner One, Mac Cache Cleaner, MacOSCleaner, Mole, OnyX, PureMac and Sensei. They differ mainly in pricing model, licence and the trade-offs each one carries. Pick by the trade-off you care about rather than by rank.
Are these system maintenance apps free?
Pricing across this group: free (Cleaner One and OnyX), open source (Mac Cache Cleaner, MacOSCleaner and PureMac) and not published (Mole and Sensei). Where we list pricing as not published, the developer does not state a model we could verify — check their own site before assuming anything about cost. We quote a price only where the record carries one from a stated source, and we never estimate one. Prices change and vary by region and by store, so always check the developer’s own page for the current figure.
Which of these system maintenance apps are open source?
Mac Cache Cleaner (MIT), MacOSCleaner (not published) and PureMac (MIT) are open source.
Do these system maintenance apps support Apple Silicon?
Apple Silicon support is explicitly stated for OnyX. For the others our data does not carry an explicit statement either way, so we do not infer one.
How do I choose between them?
Start with how you pay: the guide groups these apps by pricing model, because the budget is the constraint most people actually have. Then check the trade-offs listed for each app: the limitations are the part that decides most people’s choice, because they describe what the app will not do for you.
Who should not use these apps?
OnyX each list an audience they are explicitly not aimed at. Those notes come from the same verified records as the rest of this guide, and they are worth reading before you install anything.
When was this data last verified?
The facts in this guide were last confirmed on 2026-10-05. Every app page carries its own verification dates and source list, so you can check any individual claim.
