iDefrag 5

Defragmentation & Optimization for Mac OS X

Download iDefrag Version 5.3.1 (13.5 MB) Buy Now $12.95

Support for this product has ended. iDefrag works fine on macOS 10.12 and earlier, but has some problems on macOS 10.13 (High Sierra). There will be no further updates or bug fixes; the product will remain available for download and purchase for the benefit of users running earlier versions of the macOS.

N.B. WE WILL NO LONGER OFFER REFUNDS FOR CUSTOMERS WHO BUY THIS PRODUCT AND IGNORE THE MESSAGES ABOUT FUNCTIONAL LIMITATIONS ON HIGH SIERRA (macOS 10.13).

Users running versions of macOS prior to Sierra (10.12), please see the compatibility chart to find the correct version for your system.

There are issues with macOS 10.13 High Sierra that affect some functionality.

If you have an SSD-based system and are running macOS 10.13, you will be using APFS, not HFS+; iDefrag does not support APFS.

New in iDefrag 5

iDefrag's main display

Why defragment?

If you use spinning disks, you’ll have noticed that over time it takes longer and longer to access your files, to start your applications and even to start your machine.

This is an unavoidable consequence of the way hard disks work. It can be made better or worse by the design of the filesystem (and, actually, in this respect your Mac’s filesystem, HFS+, is one of the best), but in the long run there’s really no way to avoid this effect.

The cause of this slow-down is fragmentation, and when it happens, you need iDefrag.

This problem largely does not affect SSDs — though they do still perform less well if files are fragmented, the difference is much smaller and for most SSD users it won’t be worth spending the time defragmenting.

Why iDefrag?

Buy iDefrag 5 now

N.B. iDefrag 5 supports Mac OS X 10.10 Yosemite to macOS 10.12 Sierra. For older releases, please see here.

iDefrag does not support macOS 10.13 at present as Apple has not released any documentation for APFS.

Pre-release versions of Mac OS X are not officially supported. They may work, or they may not.