System Storage Explorer

System Storage Explorer started as a personal need: a developer's home directory can silently accumulate hundreds of gigabytes across node_modules trees, build caches, and stale toolchain downloads. No native tool exposes the tree with enough resolution to act on it. The app scans any folder the user points at and makes the weight of every node visible at a glance, with four interchangeable views and a per-node inspector that names the risk tier. It now ships as Leftovers, a paid macOS utility whose pitch narrows the problem to its sharpest case: the caches, containers, and support files that deleted apps leave hiding inside System Data.

The treemap is the primary surface. Area encodes size, so the dominant consumer is always the first thing you see. The sunburst adds depth: it renders two levels of nesting simultaneously, so a large folder that hides its weight in many subdirectories is still visible. The list view trades spatial metaphor for precision: folders are ranked by size with a proportional bar, useful when you want to scan a long directory quickly. The dashboard breaks the entire tree into six risk-tagged categories (Media, Dependencies, Cache & Logs, Code, Applications, Documents) so you can triage by type rather than by path. All four views share a single Inspector panel on the right; clicking any node shows its exact size, item count, percentage of parent, and the category verdict.

Tauri was chosen over Electron for two reasons: the Rust scanner can walk a 500 000-file tree in under two seconds with minimal memory overhead, and the resulting app bundle is under 10 MB. The React layer is a pure presentation layer. It receives typed DTOs from Rust commands via invoke() and renders without maintaining its own file-system state.

That separation paid for itself at launch: because the UI never touches the file system directly, swapping the Tauri bridge for a mock module produces a fully interactive browser demo of the real app, seeded with fake data. The Leftovers landing page links straight to it, so "Try the live demo" costs the visitor nothing and shows the actual product, not a video of it.