Measure Your Hard Drive To Clean and Speed Up Your Mac

WhatSize for Mac

WhatSize 6.6.3

  -  10.6 MB  -  Demo

Sometimes latest versions of the software can cause issues when installed on older devices or devices running an older version of the operating system.

Software makers usually fix these issues but it can take them some time. What you can do in the meantime is to download and install an older version of WhatSize 6.6.3.


For those interested in downloading the most recent release of WhatSize for Mac or reading our review, simply click here.


All old versions distributed on our website are completely virus-free and available for download at no cost.


We would love to hear from you

If you have any questions or ideas that you want to share with us - head over to our Contact page and let us know. We value your feedback!

  • WhatSize 6.6.3 Screenshots

    The images below have been resized. Click on them to view the screenshots in full size.

    WhatSize 6.6.3 Screenshot 1
  • WhatSize 6.6.3 Screenshot 2
  • WhatSize 6.6.3 Screenshot 3
  • WhatSize 6.6.3 Screenshot 4
  • WhatSize 6.6.3 Screenshot 5

What's new in this version:

WhatSize 6.6.3
Improvements and bug fixes:
- Compatibility with macOS High Sierra (10.13)
- General bug fixes


WhatSize 6.5.4
- Improvements and bug fixes (FREE to all v6 users)
- Improvements to handle TimeMachine volumes on remote machines or on external drives
- Improvements to physical (On Disk) file size accuracy
- Better support for SMB mounted volumes
- General bug fixes


WhatSize 6.5.3
- Updated to support macOS Sierra


WhatSize 6.5.2
Improvements and bug fixes (FREE to all v6 users):
- Sparkle updates are now using the more secure SSL protocol
- When measuring SSD or Flash drives the app will scan a few times faster
- Bug fixes and enhancements to printing
- General bug fixes


WhatSize 6.5.1
- Improvements and bug fixes (FREE to all v6 users)
- Sparkle updates are now using the more secure SSL protocol
- When measuring SSD or Flash drives the app will scan a few times faster
- General bug fixes