Built DiskNuke to save disk space in couple clicks.

Owning 256GB Mac Mini in the AI era is not perfect.

It need a frequent cleaning, often I find that burning tokens to find nook and corner or updating shell script for every tool you install. Enter DiskNuke.

Built using Devin’s new feature to build and test Mac apps in a jiff.

Devin’s test feature will exceed your expectation. If you know how to architect your app, Devin will perfectly shape it.

Repo: https://github.com/QAInsights/disk-nuke…

@cognition @DevinAI @devindesktop

QAInsights/disk-nuke

Source: https://github.com/QAInsights/disk-nuke

Disk Nuke

A native macOS disk cleaner that finds reclaimable space — caches, logs, build artifacts, old downloads — and deletes it safely.

Features

• Categorized scanner — 18 categories (app caches, logs, temp files, Trash, Xcode DerivedData/Device Support/Simulators/Archives, node_modules, Swift .build, Gradle, Homebrew cache, Safari/Chrome/Firefox caches, old Downloads, Mail downloads, .DS_Store) scanned concurrently with live per-category progress and per-category enable toggles
• Large Files finder — walks your home folder and surfaces the biggest files above a configurable threshold, sorted by size and last access
• Dry-run preview + confirmation — itemized confirmation sheet shows item count, recursive file count, and total bytes before anything is deleted; deletion is permanent and itemized failures are reported
• Safety guardrails — hardcoded denylist (Documents, Desktop, Pictures, system paths, .app bundles, scan roots themselves), user-defined exclusions, and in-use/inaccessible files are skipped and reported rather than failing the run
• Customization — min size/age thresholds, downloads age, large-file threshold, custom scan paths (whole folder / contents / older-than-N-days), all persisted via UserDefaults; -extraScanRoot /path launch argument or DISK_NUKE_EXTRA_ROOT env var seeds a test path
• Main window + menu bar quick-clean — menu bar popover shows reclaimable space and can quick-clean safe categories without opening the app

Screenshots

Requirements

• macOS 14.0+
• Xcode 16+ (developed with Xcode 26)

Build

xcodebuild -project DiskNuke.xcodeproj -scheme DiskNuke -configuration Debug -derivedDataPath build clean build CODE_SIGN_IDENTITY=- CODE_SIGNING_REQUIRED=NO

The app is at build/Build/Products/Debug/DiskNuke.app. Or open DiskNuke.xcodeproj in Xcode and press Cmd-R.

The project is configured for ad-hoc signing (CODE_SIGN_IDENTITY="-", no development team) and has no App Sandbox entitlement — it needs broad filesystem access to do its job.

Install

Build a Release binary and copy it to Applications:

xcodebuild -project DiskNuke.xcodeproj -scheme DiskNuke -configuration Release -derivedDataPath build build CODE_SIGN_IDENTITY=- CODE_SIGNING_REQUIRED=NO
cp -R build/Build/Products/Release/DiskNuke.app /Applications/

Or download DiskNuke.zip from the Releases page. The app is not notarized, so on first launch right-click DiskNuke.app and choose Open, or clear the quarantine flag:

xattr -dr com.apple.quarantine /Applications/DiskNuke.app

CI / Releases

.github/workflows/build.yml builds a Release DiskNuke.app on every push and pull request (uploaded as a workflow artifact) and publishes DiskNuke.zip plus a SHA-256 checksum to a GitHub Release when a v* tag is pushed:

git tag v1.0.0 && git push origin v1.0.0

Full Disk Access

Some locations (Mail, Safari caches, parts of ~/Library) are protected by macOS privacy controls. Without Full Disk Access, affected categories show an orange lock icon and report what could not be read — nothing fails silently. Grant access in System Settings → Privacy & Security → Full Disk Access, or use the button in Disk Nuke’s Settings → Permissions tab.

Regenerating the icon

swift Scripts/generate_icon.swift

This renders all AppIcon.appiconset PNGs (16–512pt @1x/@2x) plus Contents.json under DiskNuke/Assets.xcassets/.

Project layout

DiskNuke/
├── DiskNuke.xcodeproj/          Xcode project + shared scheme
├── Supporting Files/
│   ├── Info.plist
│   └── DiskNuke.entitlements    (empty — no sandbox)
├── DiskNuke/
│   ├── DiskNukeApp.swift        WindowGroup + MenuBarExtra + Settings
│   ├── Models/                  CleanupCategory, ScanRule, ScanItem, CategoryResult
│   ├── Engine/                  SizeCalculator, SafetyGuard, Scanner,
│   │                            LargeFilesScanner, Deleter
│   ├── Storage/                 AppSettings (UserDefaults persistence)
│   ├── ViewModels/              ScanCoordinator
│   ├── Views/                   ContentView, LargeFilesView, ConfirmNukeSheet,
│   │                            SettingsView, QuickCleanView
│   ├── Utilities/               Formatters, Debug
│   └── Assets.xcassets/         AppIcon, AccentColor
├── Scripts/generate_icon.swift  AppKit/CoreGraphics icon renderer
└── docs/screenshots/

Safety notes

• Deletion is permanent (no Trash round-trip); always review the confirmation sheet.
• The safety guard refuses to delete denylisted paths, user exclusions, .app bundles outside cache roots, and the configured scan-root directories themselves — only their contents are deletable.
• Files that fail to delete (in use, permission denied) are skipped and listed in the result sheet.
• Custom paths and exclusions are powerful; only add directories you understand.

License

MIT — see LICENSE. Copyright 2026 QAInsights.

Cognition (@cognition): Special delivery: Devin just got a Mac 🍎

Now Devin can:

1. Build & test apps on its own Mac VM with iOS simulator
2. Send a screen recording via Slack
3. Send a TestFlight link so you can start using it 📲