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
1.9K Ratings

1.9K 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.

nutella_98 ,

Secret updates in the background

The only reason I rate the app two star is because it does 'secret' updates in the background. You have no way of specifying whether you want to check for updates or not. The app does whatever it does in the background, whenever it wants. Despite the fact that the release date on the app store (and in the app's about dialog) is v1.4, which was released in 2015, the app regularly does updates. One day you open the app and you get a splash screen saying "Thank you for updating to the latest version..." What kind of sarcastic marketing gimmick is this!? You know that the customer did not chose to update the software. You did that secretly. Based on this kind of shady tactics, who knows what other information the app collects and sends. Unless you use apps like Little Snitch, you will never know.

Other than this, the app would seem decent enough to use although you can pretty much do anything manually yourself.

Developer Response ,

Thanks for the feedback and really sorry for the issue! The app is sandboxed and reviewed by Apple, to assure Mac users the app does not have hidden features.
Welcome window is only supposed to show up at updates to inform you about changes. If the window comes up more often it is caused by a rare OS bug. Please contact us for a workaround at Thanks for your understanding!

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!


Rocky Sand Studio Ltd.
2.1 MB

OS X 10.7 or later, 64-bit processor



Age Rating


  • Family Sharing

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