Best UltimateDefrag 6 Alternatives in 2026
Updated
20 platforms from disk defragmentation software ranked against UltimateDefrag 6 on the same published basis.
- 1UltimateDefrag 6 vs IObit Uninstaller
- 2UltimateDefrag 6 vs Microsoft Quick Assist
- 3UltimateDefrag 6 vs Auslogics Driver Updater
- 4UltimateDefrag 6 vs O&O AppBuster
- 5UltimateDefrag 6 vs Puran Defrag
- 6UltimateDefrag 6 vs DiskTuna
- 7UltimateDefrag 6 vs WinContig
- 8UltimateDefrag 6 vs DymaxIO
- 9UltimateDefrag 6 vs IObit Smart Defrag
- 10UltimateDefrag 6 vs Btrfsmaintenance
- 11UltimateDefrag 6 vs Disk SpeedUp
- 12UltimateDefrag 6 vs FreeDOS Defrag
- 13UltimateDefrag 6 vs Defragger
- 14UltimateDefrag 6 vs e4defrag
- 16UltimateDefrag 6 vs xfs_fsr
- 17UltimateDefrag 6 vs Shake
- 18UltimateDefrag 6 vs Defraginator
- 19UltimateDefrag 6 vs UltraDefrag
- 20UltimateDefrag 6 vs Windows Backup
- 21UltimateDefrag 6 vs O&O Defrag
UltimateDefrag 6 alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | IObit Uninstaller | 7.2 | Free plan | $1.23/mo | Windows |
| 2 | Microsoft Quick Assist | 7.0 | Free plan | Free | Mac, Web, Windows |
| 3 | Auslogics Driver Updater | 6.8 | Free plan | Free | Windows |
| 4 | O&O AppBuster | 6.8 | No | — | Windows |
| 5 | Puran Defrag | 6.8 | Free plan | Free | Windows |
| 6 | DiskTuna | 6.7 | No | — | Windows |
| 7 | WinContig | 6.7 | Free plan | Free | Windows |
| 8 | DymaxIO | 6.6 | No | $5.75/mo | Windows |
| 9 | IObit Smart Defrag | 6.6 | Free plan | $1.67/mo | Windows |
| 10 | Btrfsmaintenance | 6.5 | Free plan | Free | Linux, self-hosted |
| 11 | Disk SpeedUp | 6.5 | Free plan | Free | Windows |
| 12 | FreeDOS Defrag | 6.5 | Free plan | Free | self-hosted |
| 13 | Defragger | 6.4 | Free plan | Free | Linux |
| 14 | e4defrag | 6.4 | Free plan | Free | Linux |
| 16 | xfs_fsr | 6.4 | Free plan | Free | Linux |
| 17 | Shake | 6.2 | No | — | Linux |
| 18 | Defraginator | 6.1 | No | — | Linux, Mac, Windows |
| 19 | UltraDefrag | 5.9 | No | — | Windows |
| 20 | Windows Backup | 5.7 | No | — | Windows |
| 21 | O&O Defrag | 5.6 | No | — | Windows |
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Questions about UltimateDefrag 6 alternatives
What is the best alternative to UltimateDefrag 6?
IObit Uninstaller, number 1 in disk defragmentation software with a score of 7.2 out of 10. The others here: Microsoft Quick Assist, Auslogics Driver Updater, O&O AppBuster and 16 more.
What is the best free alternative to UltimateDefrag 6?
IObit Uninstaller is the best-ranked alternative with a free plan. 12 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on.