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MacWorld GEM - Disk Diet safely and quickly frees up gigabytes of wasted disk space.

It's a common factor with most Mac users that at some point the drive will run out of space. When this happens, it's difficult to find which files are safe to remove, especially trying to hunt through multiple folders looking for them. Disk Diet does all this in about a minute, while searching through all these areas:

• Application Logs
• System Logs
• Caches
• Trash
• Downloads
• Mail Downloads
• Old iOS Software Updates
• Unused applications
• Unused language translations from applications
• Developer Folders from Xcode
• iPhoto Trash

Disk Diet was first released as the original disk cleaning app for macOS in 2011 and we've been updating it ever since. Now, it's 2021 and it's ready for macOS Big Sur and Apple Silicon. Awarded a MacWorld GEM, and with over 100,000 downloads, it's the premier disk utility that all Mac users need to have.

We offer quick and easy support if there are any questions or issues. Please feel free to email us anytime and we'll do our best to get back to you as soon as possible.

What’s New

Version 5.5

• Added full compatibility with macOS Big Sur, including a new app icon.
• Added support for Apple Silicon.
• Improved the translations for multiple languages.
• Fixed issue where external disks wouldn't be available if they were formatted as APFS.
• Fixed issue where the cloudd process could crash when cleaning out the caches.
• Fixed issue where the disk space bar wasn't being drawn properly.
• Fixed issue where some types of un-installers would be included in the list of apps.

Ratings and Reviews

4.6 out of 5
135 Ratings

135 Ratings

PHD in the 613 ,

Just works

Love this app. It’s my first go-to when my drive is getting tight on space, before even emptying the trash since it does that for you. Really effective at scouring the contents of all those directories under ~/Library that I don’t want to think about myself.

Flash Bruce ,

Helpful in tight situations :-)

I’m not sure that this gets rid of absolutely all things that are probably unnecessary for most people, but it does categorize them and give you simple choices.

sunsport22v ,

Does absolutely nothing!

It does not even delete my trash folder! I have enable the program to have all access in the Security and Privacy Settings, yet it does not do a thing. Every time I run the program it says the same thing. Free up 242 megabytes. I ‘click’ diet, program does it thing, then I run it again, and it says free up 242 megabytes again. I looked at my available hard drive space and it never changes! This is a complete waste of money!

Developer Response ,

We're sorry to hear you aren't enjoying Disk Diet. It sounds like it could be the Caches area that will get rebuilt automatically by certain apps. The idea is the app can clean out the caches that aren't needed anymore to free up space. When you get a chance, please email support so we can get this fixed up for you.

App Privacy

The developer, Tunabelly Software Inc., 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

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