The Space Map in Strata: cards, list, columns and treemap

The Space Map draws whatever you scanned to scale, so the biggest things are the biggest shapes on screen. It is free, including every view, every way of looking and the search. Moving things to the Trash from it needs Strata Pro.

The four views

Four buttons at the top of the room switch between the views, and Strata remembers the one you used last. Each has a shortcut, which works while the Space Map is showing:

View	Shortcut	What it is for
Cards	`Command` `1`	Each app, folder or file is a rounded card with its icon, name and size, and the biggest things inside it are smaller cards. The rest of a long list becomes one +N more card. The quickest way to see where the space went.
List	`Command` `2`	Rows as in Finder's list view, with triangles that open folders in place; Option-click a triangle to open what is inside too, the nearest first, up to 1,000 rows. A folder with more than 500 rows opens 500 at a time, with a "+N more" row at the end that opens the next 500. Click Name, Kind or Size to order by it, and again to reverse.
Columns	`Command` `3`	As in Finder's column view: the folder you choose opens in the next column. The arrow keys move in and out.
Detailed Map	`Command` `4`	The classic treemap, drawn down to single files. Point at a rectangle to read what it is; click a folder to go in.

The Detailed Map is drawn for All Items. While you search, or look at a folder by its apps, folders or kinds, the map shows as cards.

Strata's Detailed Map: the Applications folder as a treemap, each app a coloured rectangle with the folders inside it drawn smaller — The Detailed Map, Command-4: the classic treemap, drawn down to single files.

Strata's Space Map in the List view: name, kind and size columns, biggest first, with triangles to open folders in place — The List view, Command-2: Finder's list, ordered by the space each item takes.

Four ways of looking at a folder

Tabs beside the view buttons change what the map shows for the folder on screen. In a narrow window their names shorten to All, Apps, Folders and Types.

All Items: What is directly inside the folder, largest first. A folder that holds only one other folder is looked through, which is why an app's Contents folder never shows.
Applications: Every app anywhere inside the folder, biggest first, however deep. Apps inside Library folders and inside other apps are left out.
Folders: The biggest folders, opened up to the level where the space actually splits, so a deep folder full of video is not hidden three levels down. Folders count from 50 MB.
File Types: Everything sorted into Apps, Videos, Music & Audio, Images, Documents, Archives, Disk Images, Code & Data and Other Files. A bundle such as a Photos library counts whole, under the kind it holds.

Strata's Space Map looking at the Applications folder by file type: one large card for Apps, with narrow cards for code, other files and documents beside it — The same folder by kind of file. Here almost everything is apps, which is what you would expect of Applications.

Moving around

Go in: double-click a card or row, or press Return on it in List or Columns.
Come back out: the Back button, or Command [.
Jump up: click any folder in the trail above the map.
Find something: the search field searches the whole scan, not just the folder on screen, and shows what matches as cards, biggest first. It follows the same rules as the Search room, so .dmg finds disk images. Esc clears it.

Strata's Space Map showing the results of a search for Microsoft as cards: Word, Excel, PowerPoint and Outlook, each sized by the space it takes — A search draws its results as cards, so the biggest match is the biggest shape.

The disk bar across the top

Above the map, one bar shows the whole disk, and pointing at a part of it explains what the part holds:

Applications: The Applications folders.
Documents: Your home folder, apart from its Library and its hidden folders.
App Data: Library folders: what apps keep for themselves, such as caches, containers and support files.
System: macOS and the folders it keeps for itself, including used space no folder accounts for, such as snapshots.
Other: Everything else the scan counted, such as hidden folders in your home folder and other people's home folders.
Rest of Disk: When you scanned one folder, the used space outside it.
Free: The disk's free space.

When a total is short because Full Disk Access is off, an orange triangle on this card says so, and clicking it shows how to switch the access on.

The inspector

The column at the right describes whatever you point at on the Detailed Map, or have chosen in the other views, or else the folder on screen. It has three tabs:

Overview: kind, size, number of items, created, modified and last opened (from Spotlight's record), the path with a copy button, and the five biggest things inside.
Files: the largest files anywhere inside, up to 15.
Info: for an app, its version and identifier; for anything, its share of the scan and of the disk, and its full path.

Open in Finder at the foot selects the item in a Finder window. It is part of Strata Pro.

Strata's Space Map inside Xcode: its folders drawn as cards, and the inspector listing its size, item count, dates and top items — Inside an app: the inspector lists when it was created, changed and last opened, and what inside it takes the most.

Choosing several, and moving to the Trash

In the List and Columns views, Command-click and Shift-click choose several items, as in Finder. The inspector then adds them up. With Strata Pro, Command Delete, the right-click menu or the inspector's button sends them all to one confirmation sheet; nothing moves until you confirm, and everything goes to the Trash. How deleting works explains what is protected and how to put things back.

The right-click menu on a card or row also has Copy Path, which is free, and Reveal in Finder, which is Strata Pro. The Trash itself offers Open Trash instead of removal: Strata never empties the Trash, because that is the one step that cannot be undone.