MacStorageAtlas

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What MacStorageAtlas is

MacStorageAtlas, also called Atlas Storage Analyzer, is a free, open-source macOS app for examining disk usage. It scans folders and volumes and presents results as a sortable folder tree and interactive treemap. File-type statistics and a largest-files view show counts, sizes, and full paths. During scans, the app displays paths, file and folder counts, and bytes scanned; you can cancel and keep partial results visible. Optional duplicate analysis checks byte-for-byte matches and skips known cloud-only placeholders. Completed scans can be filtered by size, dates, extension, file category, and shared storage, then exported as CSV or JSON. Scan history is optional and off until enabled; snapshots remain on the Mac without file contents. Reviewed eligible items can be moved to macOS Trash, while broad or sensitive containers are blocked. Cleanup baskets can be moved or copied to external or network volumes, with destination-name collisions blocked. Builds support Apple Silicon and Intel Macs. The Free plan costs nothing.

Who it suits

MacStorageAtlas suits Mac users who need to inspect storage, locate large files, review duplicates, or prepare cleanup lists. It is also useful for people wanting local scan history and CSV or JSON exports.

What it does well

Interactive treemap and sortable folder tree
Duplicate checks compare byte-for-byte matches
Filters cover size, dates, and file categories
Exports results as CSV or JSON
Supports Apple Silicon and Intel Macs

What to know first

Mac-only platform
App Store build reads only selected locations
Cleanup blocks broad or sensitive containers
History must be enabled manually

Plans

Plan	Billed and limits	Price
Atlas Storage Analyzer	Free on GitHub and the Mac App Store · macOS · Apple Silicon and Intel	Free

As lachi90.github.io lists them, read 12 Oct 2026. The maker's own page has the final word.

Verdict

MacStorageAtlas provides detailed, local storage analysis with filtering, duplicate review, and controlled cleanup actions. Its macOS-only availability and access restrictions should be considered before choosing it.

Facts from MacStorageAtlas's own pages

Access limits: The sandboxed Mac App Store build can read only locations the user selects; the GitHub build provides guidance for granting Full Disk Access. · lachi90.github.io, 12 Oct 2026
Archiving: Users can move or copy a reviewed cleanup basket to an external or network volume; colliding destination names are blocked instead of overwritten. · lachi90.github.io, 12 Oct 2026
Cleanup: Eligible items can be moved to macOS Trash after review, while broad or sensitive containers are blocked in the app. · lachi90.github.io, 12 Oct 2026
Downloads: GitHub Release DMGs are described as signed, notarized, stapled, and published with SHA-256 checksums; the Mac App Store edition is free. · lachi90.github.io, 12 Oct 2026
Duplicate review: Optional duplicate analysis checks byte-for-byte matches and skips known cloud-only placeholders. · lachi90.github.io, 12 Oct 2026
File breakdowns: It includes tabs for file-type statistics and the largest files, with counts, sizes, and full paths. · lachi90.github.io, 12 Oct 2026
File-type breakdown: Yes · lachi90.github.io, 23 Sept 2026
Filters and exports: Users can filter completed scans by size, dates, extension, file category, and shared storage, then export results as CSV or JSON. · lachi90.github.io, 12 Oct 2026
Free plan: Yes · lachi90.github.io, 23 Sept 2026
Hardware support: The release provides separate macOS builds for arm64 Apple Silicon and x64 Intel Macs. · lachi90.github.io, 12 Oct 2026
License: The project is free and open source under the MIT License. · lachi90.github.io, 12 Oct 2026
Local history: Optional scan history is off until enabled; snapshots stay on the Mac and do not include file contents. · lachi90.github.io, 12 Oct 2026
Maker: The product is supported by Lachmann Thiem Software, which describes itself as a German software company. · lachi90.github.io, 12 Oct 2026
Desktop platforms: macos · lachi90.github.io, 23 Sept 2026
Privacy and data handling: The product page says scan history snapshots stay on the Mac and never include file contents. · lachi90.github.io, 12 Oct 2026
Purpose: Atlas Storage Analyzer scans folders and volumes on macOS and displays disk usage as a sortable folder tree and interactive treemap. · lachi90.github.io, 12 Oct 2026
Scan controls: Scans show live paths, file and folder counts, and bytes scanned, and can be cancelled while partial results remain visible. · lachi90.github.io, 12 Oct 2026
Scan scope: files_folders_apps · lachi90.github.io, 23 Sept 2026
Treemap view: Yes · lachi90.github.io, 23 Sept 2026

Where MacStorageAtlas stands on Freedom251

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