O&O Defrag vs UltimateDefrag 6

O&O Defrag8.8Visit UltimateDefrag 68.2Visit

Higher score O&O Defrag #3 in Disk Defragmentation Software 8.8/10 30-day trial Free trial✓ 3 of 3 features Visit O&O Defrag

vs

UltimateDefrag 6 #6 in Disk Defragmentation Software 8.2/10 Paid ✓ 3 of 3 features Visit UltimateDefrag

• O&O Defrag fits best

  Paid Windows optimization with health checks

• UltimateDefrag 6 fits best

  Strategic FAT32 and NTFS optimization

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature	O&O Defrag 8.8/10 Visit ↗	UltimateDefrag 6 8.2/10 Visit ↗
At a glance
Editor score	8.8	8.2
Ranking	#3 in Disk Defragmentation Software	#6 in Disk Defragmentation Software
Best for	Paid Windows optimization with health checks	Strategic FAT32 and NTFS optimization
Pricing model	Paid	Paid
Starting price	$49.95/device one-time	$29.95 one-time
Free plan	—	—
Free trial	30 days	—
Money-back guarantee	30 days	30 days
Deployment	Desktop	Desktop
Platforms	Windows	Windows
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business
Features O&O Defrag 3/3 · UltimateDefrag 6 3/3
Scheduled optimization	✓	✓
Automatic optimization	✓	✓
Boot-time optimization	✓	✓
Specs
Drive types	Both	Both
Filesystem support	Multi-filesystem	Multi-filesystem
Maximum drive count	Not checked yet	Not checked yet
Our review
Pros	Supports HDD defragmentation plus SSD and NVMe optimization Includes scheduling, background automation, and boot-time jobs Adds health monitoring, benchmarking, repair, and disk cleanup	Supports FAT32, NTFS, HDD, SSD, external, and RAID configurations Combines scheduling, automation, boot-time placement, and file-level jobs Includes simulation mode, command-line directory defragmentation, and three-PC licensing
Cons	Windows-only software No free plan Professional Edition covers one PC	Windows-only software with no listed support for other platforms The regular license price is a $29.95 one-time purchase The trial operates only in simulation mode and makes no drive changes
Our verdict	O&O Defrag is Windows software for analyzing and optimizing storage drives. Professional Edition is aimed at home users and individual workstations, covering traditional hard disks alongside SSD and NVMe storage. Its scope extends beyond… Read the review →	UltimateDefrag 6 is Windows desktop software for defragmenting and optimizing hard drives and SSDs. It is aimed at users who want more control than a basic drive-maintenance utility, particularly when working with FAT32 or NTFS volumes and… Read the review →

Strengths and trade-offs

• O&O Defrag — where it wins

  • Supports HDD defragmentation plus SSD and NVMe optimization
  • Includes scheduling, background automation, and boot-time jobs
  • Adds health monitoring, benchmarking, repair, and disk cleanup

  Where it doesn't

  • Windows-only software
  • No free plan
  • Professional Edition covers one PC

• UltimateDefrag 6 — where it wins

  • Supports FAT32, NTFS, HDD, SSD, external, and RAID configurations
  • Combines scheduling, automation, boot-time placement, and file-level jobs
  • Includes simulation mode, command-line directory defragmentation, and three-PC licensing

  Where it doesn't

  • Windows-only software with no listed support for other platforms
  • The regular license price is a $29.95 one-time purchase
  • The trial operates only in simulation mode and makes no drive changes

• O&O Defrag8.8/10 · 30-day trial

  A paid Windows optimizer combining drive maintenance, monitoring, and automation.

  Visit O&O DefragFull verdict →
• UltimateDefrag 68.2/10 · Paid

  A focused Windows optimizer for FAT32, NTFS, HDD, and SSD maintenance.

  Visit UltimateDefragFull verdict →