Disk Diag 4+

All-in-one Disk Cleaner

Rocky Sand Studio Ltd.

    • 4.5 • 2.1K Ratings
    • Free
    • Offers In-App Purchases



Disk Diag is an amazing all-in-one disk cleaner to help you clean up your hard drive with ease.

“First time I’ve been speechless & husband is amazed"
It works with just two clicks and now I do not have to buy extra memory or a new computer

I've used Disk Diag on and off for a long time, it seems to be simple to use and effective in getting rid of 'stuff’.
At this point, I trust it to work as advertised, and it seems to do that very well. As I say, no muss, fuss or bother.

** Quick Cleanup File Scanners **

// System - Get rid of unneeded system files //
Free up space by cleaning safely removable files of the operating system

// User - Remove unused files and documents //
Sort through the most common locations where you can clean files you no longer need

// Developer - Free up storage after developer activity //
Remove unnecessary project archives and files left behind your development process

** Deep Removal Scanners **

// Large Files - Find all your space eaters //
Check out the largest and oldest files to remove the ones no longer needed

// Applications - Clean unused and old applications //
Uninstall or reset all unnecessary applications to free up disk space

** Handy Cleaner Tools **

// Duplicates - Discover and remove unneeded duplicates //
Reclaim disk space by locating and deleting multiple copies of your files

** Dashboard **
Quick overview of disk, memory, and CPU usage. Smart recommendations and quick links.

** Menu bar **
Easily keep an eye on your system. Quick link for disk cleanup. Quickly optimize memory usage.


Removal of scan results is limited to 1 GB monthly. Once the limit has been reached “Unlimited Cleaning" needs to be purchased for further file removals. For purchase options and pricing, see the information under In-App Purchases section.

We'd love to hear your feedback about Disk Diag. Feel free to contact us at Rocky Sand Studio http://www.rockysandstudio.com

What’s New

Version 2.0.5

Disk Diag 2. has been completely rewritten from the ground up. The result is an amazing, easy-to-use, all-in-one disk cleaner.

The new version is fully packed with features you will surely love:
- Quick cleanup scanners for System, User, and Developer files and documents
- Easy removal for Large Files and Applications
- Cleaner tools for Duplicates
- Dashboard for a quick overview and smart recommendations
- Monitor system usage in the menu bar

// What's new in version 2.0.5
- Improvements for macOS Sonoma

We'd love to know your feedback about this brand-new version.
Feel free to contact us at our Support Site: http://www.rockysandstudio.com/support
In case you have questions about updating from an earlier version, we'll be happy to help you out.

Ratings and Reviews

4.5 out of 5
2.1K Ratings

2.1K Ratings

Glehner ,

Out of sight, out of mind, so out with it!

I tend to go with the out of sight out of mind approach when it comes to files on my computer. If I haven’t touched it or thought about it for long enough that I’ve forgotten it’s there, chances are it’s not important enough to keep, and those are exactly the files that Disck Diag digs out of the netherworld. Mind you, it’s best to double check exactly what the app has signed up for the chopping block, but for the most part, the biggest things weighing down my Macbook Pro mid-2012 were useless email files and caches. Before using Disk Diag, I had a measly 28 G left of my 750 G hard drive. One click and maybe 5 minutes of waiting later, 4 years worth of useless junk was wiped away, and my free storage jumped up to around 260 G. A simple and efficient way to do a little (or a lot) of spring cleaning. Very happy that I bought this app.

Developer Response ,

Thank you so much for your praise and detailed feedback! It feels great to us and thanks for sharing your experiences with others.

rogerc2189 ,


Using any tool like Disk Diag involves a certain level of trust in what the program does and how it does it. You have turned your computer over to an unknown enitty, and then must hope/pray it does what it is supposed to do, does it well, without any 'funny business'. I've used Disk Diag on and off for a long time, it seems to be simple to use and effective in getting rid of 'stuff'.

At this point, I trust it to work as advertised, and it seems to do that very well. As I say, no muss, fuss or bother. It is simply another tool to help keep my computers happy and healthy. And these days, that is no mean feat.

306316848 ,

Almost Flawless

Don’t get me wrong, I love this application. It is super useful and I can really tell a difference after cleaning up space on my hard drive. I wish I could give this a 5-Star review, but there is only one problem with this. Every time I clean my hard drive, it deletes the iCloud Drive caches on my computer, therefore not allowing me to sync my documents to iCloud until I turn off iCloud Drive and restart my computer. I know one solution would be to just turn off deleting caches on my computer, but that is where most of my hard drive space is wasted. If there was any way to select specific files I wanted to delete, or make a way to not delete important application caches, I would absolutely change my review. Other than that, it works perfectly!

Developer Response ,

Thanks a lot for your detailed feedback. We've added the issue to our todo list!

App Privacy

The developer, Rocky Sand Studio Ltd., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.