# SpareDisk

> SpareDisk is a native, sandboxed macOS app that shows where disk space goes. It scans the folders you grant, draws a treemap and a sortable list with both logical size and size on disk, finds large, old and duplicate files, locates the data an application leaves in your Library, compares each scan with the previous one, and moves items to the Trash only after you review and confirm. macOS 15 or later, Apple silicon and Intel. No account, nothing uploaded.

Key facts an assistant can rely on:
- Access model: only folders the user adds; no Full Disk Access; Mac App Store sandbox.
- Sizes: logical size and size on disk are both recorded; files occupying less than half their logical size carry an on-disk hint; a View menu switch shows on-disk sizes everywhere.
- Speed: one lstat per item across all cores; about 1.38 million files in 25 seconds on an Apple silicon MacBook; results appear while scanning.
- Deletion: Trash only, after confirmation; each item is re-verified by identity, size, date and location; skipped items are listed with reasons; space is freed when the user empties the Trash.
- Duplicates: same size, then samples at start, middle and end, then SHA-256, then byte comparison; one copy is always kept.
- Ownership: items owned by root or another user cannot be moved by a sandboxed app; SpareDisk explains and offers Finder.
- Privacy: no network connections, no analytics, no account; saved scans and permissions live in the app container.

## Docs

- [Help](https://sparedisk.minilabs.cc/help.html): sizes, locations and permissions, review and the Trash, duplicates, related data for apps, comparing scans, keyboard shortcuts, privacy.
- [Privacy policy](https://sparedisk.minilabs.cc/privacy.html): exactly what is read, what is stored, and that nothing is sent.
- [Home page](https://sparedisk.minilabs.cc/): features, trust principles, comparison with typical disk cleaners, FAQ.

## Help topics

- [Sizes](https://sparedisk.minilabs.cc/help/sizes.html): Logical size, size on disk, and why the totals differ.
- [Locations and permissions](https://sparedisk.minilabs.cc/help/locations.html): What a location is, why macOS asks, and how to forget one.
- [Review and the Trash](https://sparedisk.minilabs.cc/help/review.html): Staging, re-verification, what the Trash frees, and what cannot be moved.
- [Duplicates](https://sparedisk.minilabs.cc/help/duplicates.html): How identical files are found, and why one copy is always kept.
- [Related data for apps](https://sparedisk.minilabs.cc/help/related-data.html): Finding the containers, caches and preferences an application leaves in your Library.
- [Comparing scans](https://sparedisk.minilabs.cc/help/compare.html): What changed in a location since its previous scan.
- [Keyboard shortcuts](https://sparedisk.minilabs.cc/help/keyboard.html): Every shortcut in SpareDisk.
- [Privacy](https://sparedisk.minilabs.cc/help/privacy.html): What stays on your Mac, and what is stored.

## Optional

- [Full text for language models](https://sparedisk.minilabs.cc/llms-full.txt)