Short answerYes. Mac tools fall into three kinds, and only one closes the loop:
- Diagnostic reports (EtreCheck, Apple Diagnostics) tell you a great deal about the Mac and leave the fixing to you.
- Cleaners (CleanMyMac and the like) remove caches and leftovers. Useful for space; rarely the reason a Mac is slow.
- Noah runs read-only checks on your Mac, names the cause it found, shows the exact change, and makes it once you approve — then logs it. Diagnosis and the plan are always free.
You have probably done the loop already: run a diagnostic, read a long report you half understood, search each line, find a forum post, and stop at the Terminal command. Or run a cleaner, watch it remove 4 GB of caches, and find the Mac exactly as slow afterwards. Both told you something. Neither fixed it.
An app that fixes problems has to do three things: look at the actual Mac, decide what is wrong, and make the change — with you approving each step. Here is how to tell which apps do that, and where each kind is the right call.
| What to look for | A diagnostic report | A cleaner | Noah |
|---|
| Where the information comes from | Read-only checks on your Mac | Its own fixed sweep | Read-only checks on your Mac — processes, login items, disk, memory pressure, network, recent crashes |
|---|
| What it tells you | Everything, in a long report | A count of removable files | The one cause it found, in plain English |
|---|
| Who makes the change | You | It does, in bulk | Noah, one change at a time, after you approve that exact change |
|---|
| Shows the change before it runs | N/A | Usually a summary | Yes — the exact change, every time |
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| Record of what changed | N/A | Sometimes | Every change in the Action Log |
|---|
| If nothing is wrong | Says so | Finds "issues" anyway | Says so |
|---|
| Price | Free or one-time | Usually a yearly plan | Diagnosis free · $29 one-time or $79/yr for the fix |
|---|
Finding the cause is the whole job
A slow Mac is usually one thing. A process — one running program — stuck at full CPU, the processor. Twenty login items. Memory pressure in the red because the Mac is swapping — using the disk as overflow for RAM, its working memory. Or a drive at 95% full. "Junk" is almost never on that list. So the app that helps is the one that checks each of these on your Mac and answers with one cause, not the one that removes the most files.
Noah's checks are read-only and specific: which processes (running programs) are active and what they use, what starts at login, where the disk space went, whether the network reaches the internet, what crashed recently. It does not open your documents or photos and never uploads your files.
Then it does the fix — one approved change at a time
With a cause found, Noah writes the fix as one sentence: "quit and restart the stuck Spotlight indexer", "remove these four login items", "delete 22 GB of old iOS backups". Nothing runs until you say go. Anything that removes data asks again and is backed up first. Every change goes in the Action Log.
Where macOS needs your password for a change, Noah tells you before it asks — it never has your password stored. Every action Noah can take is a hand-built tool with a fixed scope, shown to you before it runs.
When something else is the right call
- You want the full picture. EtreCheck's report is thorough and free to read. If you like reading it, it is a good complement.
- You only need space. A cleaner or macOS's own Settings → General → Storage will free caches and large files. That is a legitimate job; it is not the same as fixing a slow Mac.
- It is hardware. A battery at 60% of its original capacity, a fan that has died, a drive reporting errors. Noah tells you when the symptom points at hardware, and Apple or a repair shop is the next step.
- The Mac will not boot. Noah is an app and needs macOS running. Use macOS Recovery.
What Noah runs on
macOS 12 and later, on Apple silicon and Intel. The client is open source, so anyone can check what it is allowed to do. There is also a Noah for Windows.
Try Noah freeA Mac that just works again.
Just tell Noah what's wrong:
My Mac's been slow and I don't know why.
Questions
Is there a Mac app that actually fixes problems instead of just telling me what is wrong?
Yes. Noah runs read-only checks on your Mac to find the cause, explains the fix in one sentence, and makes the change only after you approve it. Diagnostic reports like EtreCheck tell you what they found and leave the fixing to you; cleaners remove caches and leftovers but do not find why a Mac is slow.
What app can automatically diagnose and fix why my Mac is running slow?
Noah. It checks the things that actually make a Mac slow: a process stuck at full CPU, too many login items, memory pressure and swapping, a nearly full drive. It names the one it found and fixes it with your approval. It is not automatic in the sense of acting without you: every change is shown first and runs only when you say so.
Is Noah a cleaner like CleanMyMac?
No. A cleaner removes caches, logs and leftover files, which frees space. Noah finds the cause of a problem and fixes that. If the cause is a full drive, Noah will free space too — but it starts from the diagnosis, not from a sweep, and it never reports a count of issues to worry you.
Is it safe to let an app change things on my Mac?
It is safe when you can see every change before it happens and stop it. Noah shows the exact change in plain English, runs nothing until you approve, asks again and backs up before anything is removed, and records every change in its Action Log. It does not read your documents, photos, passwords or browser history, and never uploads your files. The client is open source.
How much does Noah cost?
Free to download. The diagnosis and the plan are always free. If you want Noah to carry out a complicated fix, it is a one-time Noah Pass for $29 or Noah Guardian for $79 a year, shown in the app before anything is charged.
CleanMyMac is a trademark of MacPaw; EtreCheck is a trademark of its owner; Mac, macOS and Spotlight are trademarks of Apple. This page is an independent guide by the Noah team and is not affiliated with or endorsed by any of them. Other products change often; check their sites for current features and pricing.