devsize-plus

A native macOS disk-usage explorer — see where your storage actually went.

devsize-plus is a TreeSize-style disk explorer for macOS: point it at a folder and it scans recursively, aggregates sizes bottom-up, and shows you the biggest offenders. It's 100% client-side — no servers, no telemetry, no database — and built to feel native and fast with Swift, SwiftUI, and Swift Concurrency.

How it works

The scanner walks the filesystem and builds an in-memory tree of FSNodes — each one holds its own size plus its children, and folder sizes aggregate up from the leaves. The scan runs as a cancellable async Task that reports progress, so the UI stays responsive even on huge directories. Access comes through a folder picker and security-scoped bookmarks — no Full Disk Access required.

public struct FSNode: Identifiable, Hashable {
    // A URL makes a stable identity for a filesystem model
    public var id: URL { url }

    let url: URL
    let isDirectory: Bool

    // filled in during the scan
    var sizeBytes: Int64 = 0
    var children: [FSNode] = []

    var name: String {
        let last = url.lastPathComponent
        return last.isEmpty ? url.path : last
    }
}

The whole scan is a tree of these — sizes aggregate from the leaves up.

What it does

Scan a folder with live progress and cancel · browse children sorted by size · drill into subfolders · reveal in Finder, Quick Look, open, copy path · move to Trash · rescan any node.

Tech stack

Swift, SwiftUI
Swift Concurrency — async/await with Task cancellation
FileManager + URLResourceValues for the filesystem walk
Folder picker + security-scoped bookmarks for sandbox-friendly access

Status

Shipping — an early, working v0.