SpaceServal is a cross-platform disk space usage analyzer. Start with a list of every mounted volume — label, file system, capacity, and a usage bar — then double-click to open a visual explorer that charts a folder's contents as an interactive pie. Sizes stream in as it scans, subdirectories are measured in parallel, and completed scans are cached so going back is instant. One native binary on Linux, macOS, and Windows.
Linux • macOS • Windows
/Volumes/MediaWorking… 440.0 GB scanned
Every mounted drive and mount point, with its label, file system, capacity, and a usage bar. Removable drives are always listed, so you can see exactly how full each volume is before you dig in.
Double-click a volume to open an explorer window with a pie chart of the current directory's top-level contents. Each wedge and legend row shows the entry's name and size on disk.
Double-click a directory wedge — or its legend row — to drill into it. The current path and an Up button sit at the bottom of the window so you can climb back out one level at a time.
Items appear as each size is computed, with an animated "Working…" indicator while a scan runs — no staring at a blank window waiting for a whole drive to be measured.
Subdirectory sizes are computed across a bounded worker pool, so large folder trees are measured quickly without saturating your machine.
Completed scans are reused, so pressing Up or revisiting a folder you've already measured is instant — no rescanning the same directories over and over.
Hover any wedge to see the entry's basename, making it easy to tell which slice of the chart maps to which file or folder on disk.
Network shares (SMB, NFS, AFP, and more) appear when you enable "Show Network Shares," so you can analyze mapped drives and mounts — or keep the list focused on local disks.
On macOS, removable volumes that the system APIs miss are recovered via getfsstat, and the firmlinked /System/Volumes/Data duplicate of / is hidden — so the list matches what Finder shows.
Light and dark themes track the OS appearance and accent color, with a selectable font size — so SpaceServal looks at home on every desktop.
Built in Rust with the Slint toolkit — a fast, single native binary with no runtime to install and no background services left behind.
A native desktop app for Linux, macOS, and Windows, on both x86-64 and ARM64 — signed and notarized where the platform supports it.
SpaceServal only measures sizes — it never deletes or moves your files, and nothing about your disks ever leaves your computer.
Every drive with its capacity
and a usage bar.
Drill into any folder with a streaming,
interactive pie chart.
Every drive with its capacity
and a usage bar.
Drill into any folder with a streaming,
interactive pie chart.
Buy SpaceServal once, then analyze disk usage across all your computers. Visualize mounted volumes, drill into folders with interactive pie charts, and reclaim space on Linux, macOS, and Windows. A license key also removes the startup splash and periodic reminder.
A cross-platform disk space usage analyzer with a visual, streaming explorer, for Linux, macOS, and Windows.
SpaceServal is a cross-platform disk space usage analyzer, written in Rust. It lists your mounted volumes with their capacity and usage, then lets you open any volume in a visual explorer that charts where space is used — so you can quickly find the folders and files eating your disk.
Double-click a volume to open an explorer window. It shows a pie chart of the current directory's top-level contents, with a legend listing each entry's name and size on disk. Double-click a directory wedge or its legend row to drill in, and use the Up button at the bottom to go back up a level.
No. Results stream in as each size is computed, with an animated "Working…" indicator while a scan runs. Subdirectory sizes are measured in parallel across a bounded worker pool, and completed scans are cached so pressing Up or revisiting a folder is instant.
Yes. Network shares — SMB, NFS, AFP, and others — are shown when you enable "Show Network Shares." Removable local drives are always listed; the network toggle just controls whether mounted shares appear alongside them.
No. SpaceServal is read-only — it only measures sizes to build the charts. It never deletes, moves, or modifies your files, and no information about your disks ever leaves your computer.
Yes. On macOS, removable volumes that the system APIs sometimes miss are recovered via getfsstat, and the firmlinked /System/Volumes/Data duplicate of / is hidden, so the volume list lines up with Finder.
Yes. SpaceServal's theme follows your operating system's light/dark appearance and accent color, and you can pick a font size — so it blends in on Linux, macOS, and Windows.
Linux, macOS, and Windows, on both x86-64 and ARM64. macOS ships a notarized .dmg; Windows ships a signed Inno Setup installer (SpaceServal-<arch>-Setup.exe); Linux includes .deb and .rpm packages.
Microsoft Edge and Microsoft Defender make it very difficult to download software from the internet these days. See this page for instructions on how to download and install perfectly safe and free software from the internet.
No. SpaceServal is free to use, and one optional license key is good for all platforms and all computers that you as an individual own. Send an email to Glowing Cat Software for information about commercial licenses.
Yes. SpaceServal source is available under the GPL 3.0 license.
Yes. SpaceServal is donationware — purchasing a license is optional, but it removes the startup splash and periodic reminder and helps support open source software development.
Download SpaceServal to visualize your mounted volumes and drill into
any folder with an interactive pie chart — on Linux, macOS, and Windows.