FSExplorer is a fast, lightweight disk space analyzer for Windows and macOS. Scan drives with millions of files in seconds using parallel traversal, then navigate your storage visually with an interactive treemap or a sortable list view.

Screenshots

Features

⚡ Parallel scan	Uses jwalk's work-stealing traversal to scan millions of files without thread-pool deadlocks
🗺 Treemap view	Squarified D3 treemap that reflows on resize — largest items immediately visible
📋 List view	Sortable table with inline size bars, type badges, and % of parent column
🔍 Filter & sort	Filter by type (image, video, audio, archive, document, code, executable); sort by size, name, or type
📂 Drill-down	Click any folder to navigate in; breadcrumb trail to jump back up
🖱 Context menu	Right-click → open in Explorer/Finder, copy path, or permanently delete
💾 Lazy IPC	Full tree lives in Rust memory; only the current folder's children cross the IPC boundary — instant navigation even on 500 GB scans
🪟 + 🍎	Native drive enumeration on Windows (GetLogicalDrives) and macOS (statvfs + /Volumes)

Installation

Download the latest installer from the Releases page:

Platform	Installer
Windows	FSExplorer_x.x.x_x64-setup.exe (NSIS)
Windows	FSExplorer_x.x.x_x64_en-US.msi
macOS	FSExplorer_x.x.x_x64.dmg

macOS note: CI builds are unsigned. If macOS blocks the app with a "damaged" warning, run:

xattr -cr /Applications/FSExplorer.app

For fully notarized builds, see code signing setup.

Development

Prerequisites:

• Rust (stable)
• Node.js 20+
• Platform prerequisites from tauri.app/start/prerequisites

git clone https://github.com/DevoidSloth/FSExplorer.git
cd FSExplorer
npm install
npm run tauri dev

Build for release

npm run tauri build
# Installers written to: src-tauri/target/release/bundle/

Regenerate app icons

Edit icon-source.svg, then:

npm install --save-dev @resvg/resvg-js
node -e "
import('@resvg/resvg-js').then(({Resvg})=>{
  const fs=require('fs');
  const png=new Resvg(fs.readFileSync('icon-source.svg','utf8'),{fitTo:{mode:'width',value:1024}}).render().asPng();
  fs.writeFileSync('icon-source.png',png);
});"
npx tauri icon icon-source.png
npm uninstall --save-dev @resvg/resvg-js

Code signing (macOS)

Add these secrets to Settings → Secrets → Actions:

Secret	Description
APPLE_CERTIFICATE	Base64-encoded .p12 Developer ID cert (base64 -i cert.p12 | pbcopy)
APPLE_CERTIFICATE_PASSWORD	Password for the .p12
APPLE_SIGNING_IDENTITY	e.g. Developer ID Application: Your Name (TEAMID)
APPLE_ID	Your Apple ID email
APPLE_PASSWORD	App-specific password from appleid.apple.com
APPLE_TEAM_ID	Your 10-character team ID

The CI workflows sign and notarize automatically once these are set.

How it works

Pick a drive → Rust scans in parallel (jwalk) → Tree built in-memory
     ↓
Navigate → get_children IPC call → React renders list or treemap
     ↓
Right-click → open in Explorer/Finder · copy path · delete

Two-phase scan:

1. Phase 1 — jwalk traverses the filesystem with a work-stealing thread pool, collecting a flat Vec<RawEntry> in parallel. Avoids the Rayon deadlock caused by recursive par_iter().
2. Phase 2 — Entries sorted deepest-first, then wired into a HashMap<PathBuf, DirNode> bottom-up. Sizes bubble up as children are attached to parents.

The full tree is held in a Mutex<TreeState> server-side. Navigation calls get_children, which does a single tree lookup and returns only immediate children as lightweight DirEntry structs — keeping IPC payloads small regardless of scan size.

Tech stack

Layer	Technology
App shell	Tauri 2 — Rust backend, WebView2 (Windows) / WKWebView (macOS)
Scan engine	jwalk 0.8 — parallel work-stealing FS traversal
Parallel sort	Rayon — parallel unstable sort of flat entry list
Treemap layout	d3-hierarchy — squarified treemap (ratio 1.4)
UI framework	React 19 + TypeScript
Build tool	Vite 7
Windows APIs	GetLogicalDrives, GetDriveTypeW, GetDiskFreeSpaceExW, GetVolumeInformationW
macOS APIs	libc::statvfs, /Volumes enumeration

Support

License

MIT © DevoidSloth