Filelight

Filelight is a free, open-source disk-usage visualizer for Linux and Windows. It suits anyone who understands storage problems better through a map than a folder list, particularly users who need to inspect removable or network disks. The main compromise is its focused scope: it does not report application sizes, and remote scans can be expensive for a busy network.

Overview

Filelight represents a selected disk, folder, or filesystem as concentric rings. Large areas stand out visually, so you can trace a storage problem through nested folders without first sorting a long table of byte counts. Detailed file and folder information adds context, and built-in deletion lets you remove an unwanted item once you have identified it.

Scanning covers local, remote, and removable disks. That range is valuable on machines with attached media or shared storage, but NFS and Samba scans can generate high network traffic. Excluding individual folders, remote filesystems, or removable media lets you keep an investigation local and focused. Privacy is also a sensible fit for a desktop utility: KDE says its software generally does not transfer device information unless the user explicitly causes an action, although a third-party distributor can alter that policy.

Key features

• Concentric-ring treemap: The visual hierarchy quickly reveals where capacity is concentrated, making it a strong choice for exploratory cleanup. It is less suitable if you want application-size reporting or a conventional size-sorted report.
• Broad scan targets: Local, remote, and removable disks can all be examined. Remote coverage expands its usefulness, while the potential traffic cost makes indiscriminate network scanning unwise.
• Details and deletion: Filelight supplies file and folder information and can delete selected files or folders, shortening the route from diagnosis to reclaimed space. Deletion therefore deserves the same care as any file-manager operation.
• Scan exclusions: Folder, remote-filesystem, and removable-media exclusions provide practical control over scan scope and network load.
• File-manager integration: Dolphin, Konqueror, and Krusader integration fits KDE-oriented workflows instead of forcing a separate navigation model.
• Configurable operation: Color schemes and scanning and appearance settings allow the display to be adapted to preference. A folder name can also be supplied on the command line to start a targeted scan.

Pricing

There is no trial because the full application is free. The plan has no stated seat, quota, or renewal charge, making it appropriate for personal and organizational users who want a no-cost scanner rather than a tiered service. Its trade-off is scope, not a paid feature gate: application sizes are absent, and the product remains a visual disk analyzer rather than a broader storage-reporting suite.

Platforms

Filelight runs on Linux and Windows. Linux users can install it through Discover or another AppStream store, a distribution package manager, or Flathub. Windows users get the same core platform coverage without the Linux-specific installation routes. KDE documentation, the UserBase Wiki, KDE Forum, and the #kde-utils channel on Libera.chat provide support paths.

Who it's for

Choose Filelight when you want to understand a crowded disk spatially, need to inspect removable media, or occasionally examine a remote filesystem while retaining exclusions to control the scope. It is especially well matched to KDE file-manager users who want cleanup actions close to their existing workflow.

Look elsewhere if application-size visibility is central, if you need a report-first interface rather than a treemap, or if scanning network mounts would create unacceptable traffic. The ring visualization is informative for exploration, but not every storage audit benefits from it.

Pros and cons

• Pro: Free, GPL-2.0+ software with no subscription or trial conversion to manage.
• Pro: Concentric rings make hierarchical space usage apparent and lead directly to file or folder deletion.
• Pro: Local, removable, and remote scan support covers more than an internal drive.
• Pro: Exclusions, appearance controls, command-line folder scans, and KDE file-manager integration add useful control.
• Con: It does not show application sizes, limiting its value for software-footprint investigations.
• Con: NFS and Samba scans may generate high network traffic, so remote analysis needs deliberate scope.
• Con: Users who prefer a ranked list or formal report may find the ring-based presentation less direct.

Alternatives

Browse all disk space analyzers for a wider comparison. WizTree is a freemium macOS and Windows option; choose it instead if you prefer that platform mix and are willing to support development with its $25 a month Individual Supporter Code. TreeSize suits Windows users wanting a free edition and a trial-backed freemium product. WinDirStat is another free Windows choice for personal or commercial use. FolderSizes fits Windows users seeking a 30.00 USD once Personal Edition license for personal and home-network use. Disk Analyzer Pro is a freemium macOS and Windows alternative with a free personal edition for local-drive reports, unwanted-file deletion, and duplicate-file reports. SizeTrend keeps core local-analysis features free on Windows and adds cleanup, storage, file, content, and duplicate-file views. OmniDiskSweeper is a free macOS utility. Disk Usage Analyzer is a free Linux desktop scanner.

Verdict

Pick Filelight if you want a no-cost visual map of disk usage on Linux or Windows, with removable and remote scan coverage and cleanup actions in the same utility. Choose another analyzer when application-size reporting, list-oriented reporting, or low-impact remote scanning matters more than its clear concentric-ring view.