Best Disk Defragmentation Software in 2026
Updated
In short: IObit Uninstaller is ranked #1 of 22 as of 5 October 2026, ahead of Auslogics Driver Updater and Btrfsmaintenance. 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.
To assess disk defragmentation software, look at the drive and filesystem details it supports as well as how it handles optimization. The comparison covers automatic, scheduled, and boot-time optimization, plus maximum drive count. Free-plan availability and paid-from pricing add cost context. The first entries are IObit Uninstaller, Auslogics Driver Updater, and Disk SpeedUp; DiskTuna and Puran Defrag also appear near the start. Compare these names against the listed drive, filesystem, and optimization criteria relevant to your setup, rather than assuming similar capabilities from the product names.
22 disk defragmentation software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
11 of the 22 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | IObit UninstallerWindows | Two bars | — | 1 of 6 | $1.23/mo | 6.4 | |
| 2 | Auslogics Driver UpdaterWindows | Two bars | — | 1 of 6 | Free | 6.3 | |
| 3 | BtrfsmaintenanceLinux · Self-hosted | Two bars | — | 1 of 6 | Free | 6.3 | |
| 4 | Disk SpeedUpWindows | Two bars | — | 1 of 6 | Free | 6.3 | |
| 5 | e4defragLinux | Two bars | — | 1 of 6 | Free | 6.3 | |
| 6 | Puran DefragWindows | Two bars | — | 1 of 6 | Free | 6.3 | |
| 7 | WinContigWindows | Two bars | — | 1 of 6 | Free | 6.3 | |
| 8 | DefraggerLinux | Two bars | — | 1 of 6 | Free | 6.2 | |
| 9 | FreeDOS DefragSelf-hosted | Two bars | — | 0 of 6 | Free | 6.2 | |
| 10 | IObit Smart DefragWindows | Two bars | — | 1 of 6 | $1.67/mo | 6.2 | |
| 11 | xfs_fsrLinux | Two bars | — | 1 of 6 | Free | 6.2 | |
| 12 | DefraginatorWindows · Mac · Linux | One bar | — | — | 3 of 6 | — | 5.4 |
| 13 | Microsoft Quick AssistWeb · Windows · Mac | One bar | — | — | 3 of 6 | — | 5.4 |
| 14 | O&O AppBusterWindows | One bar | — | — | 1 of 6 | — | 5.4 |
| 15 | DiskTunaWindows | One bar | — | — | 1 of 6 | — | 5.3 |
| 16 | ShakeLinux | One bar | — | — | 1 of 6 | — | 5.3 |
| 17 | Windows BackupWindows | No signal | — | — | 1 of 6 | — | 5.2 |
| 18 | AutorunsNo platforms listed | No signal | — | — | 0 of 6 | — | 5.0 |
| 19 | DymaxIOWindows | One bar | — | — | 1 of 6 | $5.75/mo | 5.0 |
| 20 | UltimateDefrag 6Windows | One bar | — | — | 1 of 6 | — | 4.9 |
| 21 | UltraDefragWindows | One bar | — | — | 1 of 6 | — | 4.9 |
| 22 | O&O DefragWindows | No signal | — | — | 1 of 6 | — | 4.8 |
Compare all 22 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Drive types | Scheduled optimization |
|---|---|---|---|---|---|---|---|---|
| 1 | IObit Uninstaller | 6.4 | Free plan | $1.23/mo | Yes | — | both | Yes |
| 2 | Auslogics Driver Updater | 6.3 | Free plan | Free | Yes | — | hdd | Yes |
| 3 | Btrfsmaintenance | 6.3 | Free plan | Free | Yes | — | both | Yes |
| 4 | Disk SpeedUp | 6.3 | Free plan | Free | Yes | — | both | Yes |
| 5 | e4defrag | 6.3 | Free plan | Free | — | — | — | — |
| 6 | Puran Defrag | 6.3 | Free plan | Free | Yes | — | hdd | Yes |
| 7 | WinContig | 6.3 | Free plan | Free | Yes | — | both | Yes |
| 8 | Defragger | 6.2 | Free plan | Free | — | — | — | — |
| 9 | FreeDOS Defrag | 6.2 | Free plan | Free | — | — | — | — |
| 10 | IObit Smart Defrag | 6.2 | Free plan | $1.67/mo | Yes | — | both | Yes |
| 11 | xfs_fsr | 6.2 | Free plan | Free | Yes | — | — | — |
| 12 | Defraginator | 5.4 | No | — | — | — | — | — |
| 13 | Microsoft Quick Assist | 5.4 | No | — | Yes | — | — | — |
| 14 | O&O AppBuster | 5.4 | No | — | No | 49.95 one-time | both | Yes |
| 15 | DiskTuna | 5.3 | No | — | Yes | — | hdd | Yes |
| 16 | Shake | 5.3 | No | — | Yes | — | — | — |
| 17 | Windows Backup | 5.2 | No | — | Yes | — | — | — |
| 18 | Autoruns | 5.0 | No | — | Yes | — | — | — |
| 19 | DymaxIO | 5.0 | No | $5.75/mo | No | — | both | Yes |
| 20 | UltimateDefrag 6 | 4.9 | No | — | No | 29.95 one-time | both | Yes |
| 21 | UltraDefrag | 4.9 | No | — | No | — | both | Yes |
| 22 | O&O Defrag | 4.8 | No | — | No | 49.95 one-time | both | Yes |
Is your app 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 Freedom251?
IObit Uninstaller is ranked #1 of 22 with a score of 6.4. Auslogics Driver Updater is second and Btrfsmaintenance 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 free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.