Disk Diag helps you to quickly find out how much disk space is used in your home folder by
- Application Caches and Logs
- Downloads and Mail Downloads folder
- Items in your Trash
- Browser Data for selected browsers
- Large files
- Application Leftovers
- iOS Software Updates
- Xcode generated files (for developers)

For your convenience you can select such predefined groups and delete all their content with a click.

We'd like to know how to improve Disk Diag, contact us at Rocky Sand Studio

What’s New

Version 1.6

[added] New module to remove unnecessary iOS software updates
[added] New module for developers to remove Xcode generated files (archives, derived data, etc.)

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., has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.