Best Disk Defragmentation Software in 2026
Updated
In short: IObit Uninstaller is ranked #1 of 22 as of 4 October 2026, ahead of O&O AppBuster and Auslogics Driver Updater. The best-ranked option with a free plan is Auslogics Driver Updater. The lowest first paid tier on this page is IObit Uninstaller at $1.23/mo.
Choosing disk defragmentation software means checking compatibility as well as how optimization is handled. Compare drive types and filesystem support, then look at automatic, scheduled, and boot-time optimization and the maximum drive count. The free plan and paid-from price provide additional points for weighing cost. The first entries include IObit Uninstaller, O&O AppBuster, DiskTuna, and Microsoft Quick Assist. Because product names alone do not establish which drive tasks an option supports, use the stated criteria to assess fit for your setup. The 22 entries are ranked across those comparison points.
22 disk defragmentation software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
22ranked
11free plans on this page
$1.23/molowest paid tier
4 Oct 2026last checked
Input list Disk Defragmentation Software 22 channels on this page · 81 of 176 spec lines stated by the makers
Ch Tool Free planPaid fromDrive typesScheduled optimizationAutomatic optimizationBoot-time optimizationFilesystem supportMaximum drive count Spec sheet Score
01 IObit Uninstaller Free planYesPaid fromnot statedDrive typesbothScheduled optimizationYesAutomatic optimizationYesBoot-time optimizationYesFilesystem supportnot statedMaximum drive countnot stated 5/8spec lines stated 7.1
02 O&O AppBuster Free planNoPaid from49.95 one-timeDrive typesbothScheduled optimizationYesAutomatic optimizationYesBoot-time optimizationYesFilesystem supportmulti-filesystemMaximum drive countnot stated 7/8spec lines stated 6.7
03 Auslogics Driver Updater Free planYesPaid fromnot statedDrive typeshddScheduled optimizationYesAutomatic optimizationYesBoot-time optimizationYesFilesystem supportntfsMaximum drive countnot stated 6/8spec lines stated 6.6
04 DymaxIO Free planNoPaid fromnot statedDrive typesbothScheduled optimizationYesAutomatic optimizationYesBoot-time optimizationnot statedFilesystem supportnot statedMaximum drive countnot stated 4/8spec lines stated 6.6
05 Puran Defrag Free planYesPaid fromnot statedDrive typeshddScheduled optimizationYesAutomatic optimizationYesBoot-time optimizationYesFilesystem supportntfsMaximum drive countnot stated 6/8spec lines stated 6.6
06 WinContig Free planYesPaid fromnot statedDrive typesbothScheduled optimizationYesAutomatic optimizationnot statedBoot-time optimizationnot statedFilesystem supportmulti-filesystemMaximum drive countnot stated 4/8spec lines stated 6.6
07 Disk SpeedUp Free planYesPaid fromnot statedDrive typesbothScheduled optimizationYesAutomatic optimizationYesBoot-time optimizationYesFilesystem supportmulti-filesystemMaximum drive countnot stated 6/8spec lines stated 6.5
08 DiskTuna Free planYesPaid fromnot statedDrive typeshddScheduled optimizationYesAutomatic optimizationNoBoot-time optimizationYesFilesystem supportmulti-filesystemMaximum drive countnot stated 6/8spec lines stated 6.5
09 Btrfsmaintenance Free planYesPaid fromnot statedDrive typesbothScheduled optimizationYesAutomatic optimizationYesBoot-time optimizationnot statedFilesystem supportnot statedMaximum drive countnot stated 4/8spec lines stated 6.4
10 Defragger Free plannot statedPaid fromnot statedDrive typesnot statedScheduled optimizationnot statedAutomatic optimizationnot statedBoot-time optimizationnot statedFilesystem supportmulti-filesystemMaximum drive countnot stated 1/8spec lines stated 6.4
11 e4defrag Free plannot statedPaid fromnot statedDrive typesnot statedScheduled optimizationnot statedAutomatic optimizationnot statedBoot-time optimizationnot statedFilesystem supportmulti-filesystemMaximum drive countnot stated 1/8spec lines stated 6.4
12 IObit Smart Defrag Free planYesPaid fromnot statedDrive typesbothScheduled optimizationYesAutomatic optimizationYesBoot-time optimizationYesFilesystem supportnot statedMaximum drive countnot stated 5/8spec lines stated 6.4
13 UltimateDefrag 6 Free planNoPaid from29.95 one-timeDrive typesbothScheduled optimizationYesAutomatic optimizationYesBoot-time optimizationYesFilesystem supportmulti-filesystemMaximum drive countnot stated 7/8spec lines stated 6.4
14 Defraginator Free plannot statedPaid fromnot statedDrive typesnot statedScheduled optimizationnot statedAutomatic optimizationnot statedBoot-time optimizationnot statedFilesystem supportmulti-filesystemMaximum drive countnot stated 1/8spec lines stated 6.3
15 Microsoft Quick Assist Free planYesPaid fromnot statedDrive typesnot statedScheduled optimizationnot statedAutomatic optimizationnot statedBoot-time optimizationnot statedFilesystem supportnot statedMaximum drive countnot stated 1/8spec lines stated 6.3
16 UltraDefrag Free planNoPaid fromnot statedDrive typesbothScheduled optimizationYesAutomatic optimizationYesBoot-time optimizationYesFilesystem supportmulti-filesystemMaximum drive countnot stated 6/8spec lines stated 6.1
17 Shake Free planYesPaid fromnot statedDrive typesnot statedScheduled optimizationnot statedAutomatic optimizationnot statedBoot-time optimizationnot statedFilesystem supportnot statedMaximum drive countnot stated 1/8spec lines stated 6.0
18 O&O Defrag Free planNoPaid from49.95 one-timeDrive typesbothScheduled optimizationYesAutomatic optimizationYesBoot-time optimizationYesFilesystem supportmulti-filesystemMaximum drive countnot stated 7/8spec lines stated 5.8
19 Windows Backup Free planYesPaid fromnot statedDrive typesnot statedScheduled optimizationnot statedAutomatic optimizationnot statedBoot-time optimizationnot statedFilesystem supportnot statedMaximum drive countnot stated 1/8spec lines stated 5.8
20 Autoruns Free planYesPaid fromnot statedDrive typesnot statedScheduled optimizationnot statedAutomatic optimizationnot statedBoot-time optimizationnot statedFilesystem supportnot statedMaximum drive countnot stated 1/8spec lines stated 5.4
21 xfs_fsr Free planYesPaid fromnot statedDrive typesnot statedScheduled optimizationnot statedAutomatic optimizationnot statedBoot-time optimizationnot statedFilesystem supportnot statedMaximum drive countnot stated 1/8spec lines stated 5.2
22 FreeDOS Defrag Free plannot statedPaid fromnot statedDrive typesnot statedScheduled optimizationnot statedAutomatic optimizationnot statedBoot-time optimizationnot statedFilesystem supportnot statedMaximum drive countnot stated 0/8spec lines stated 5.0
Compare all 22 in a table
| # | Tool | Score | Free plan | From | Free plan | Paid from | Drive types | Scheduled optimization |
|---|---|---|---|---|---|---|---|---|
| 1 | IObit Uninstaller | 7.1 | Free plan | $1.23/mo | Yes | — | both | Yes |
| 2 | O&O AppBuster | 6.7 | No | — | No | 49.95 one-time | both | Yes |
| 3 | Auslogics Driver Updater | 6.6 | Free plan | Free | Yes | — | hdd | Yes |
| 4 | DymaxIO | 6.6 | No | $5.75/mo | No | — | both | Yes |
| 5 | Puran Defrag | 6.6 | Free plan | Free | Yes | — | hdd | Yes |
| 6 | WinContig | 6.6 | Free plan | Free | Yes | — | both | Yes |
| 7 | Disk SpeedUp | 6.5 | Free plan | Free | Yes | — | both | Yes |
| 8 | DiskTuna | 6.5 | No | — | Yes | — | hdd | Yes |
| 9 | Btrfsmaintenance | 6.4 | Free plan | Free | Yes | — | both | Yes |
| 10 | Defragger | 6.4 | Free plan | Free | — | — | — | — |
| 11 | e4defrag | 6.4 | Free plan | Free | — | — | — | — |
| 12 | IObit Smart Defrag | 6.4 | Free plan | $1.67/mo | Yes | — | both | Yes |
| 13 | UltimateDefrag 6 | 6.4 | No | — | No | 29.95 one-time | both | Yes |
| 14 | Defraginator | 6.3 | No | — | — | — | — | — |
| 15 | Microsoft Quick Assist | 6.3 | No | — | Yes | — | — | — |
| 16 | UltraDefrag | 6.1 | No | — | No | — | both | Yes |
| 17 | Shake | 6.0 | No | — | Yes | — | — | — |
| 18 | O&O Defrag | 5.8 | No | — | No | 49.95 one-time | both | Yes |
| 19 | Windows Backup | 5.8 | No | — | Yes | — | — | — |
| 20 | Autoruns | 5.4 | No | — | Yes | — | — | — |
| 21 | xfs_fsr | 5.2 | Free plan | Free | Yes | — | — | — |
| 22 | FreeDOS Defrag | 5.0 | Free plan | Free | — | — | — | — |
Is your tool on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which disk defragmentation software is ranked first on Specifiction?
IObit Uninstaller is ranked #1 of 22 with a score of 7.1. O&O AppBuster is second and Auslogics Driver Updater third.
How many of these have a free plan?
11 of the 22 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, IObit Uninstaller has the lowest first paid tier we found: $1.23/mo.
How is this list ranked?
Ranked on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.
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