Leftovers

How it finds them

The search starts by itself when Strata opens, with Strata Pro or the trial. It reads the same 18 Library locations the Uninstaller uses, and considers only entries named like an app's identifier, such as com.vendor.app. Then it rules out anything that could still be in use. It never offers:

• Apple's files, a whole suite's shared files, or the folder of a shared library such as Sparkle or Electron;
• anything from a vendor that still has an app, a package or a helper installed on this Mac;
• anything macOS still knows an app for, anywhere on the disk.

An app sitting in the Trash does not count as installed, so its files show up here with the tag In the Trash. They stay in your Library until they are moved too.

How sure it is

With the app gone there is no identifier to be certain against, so nothing here is graded Certain. Each item carries one of three tags:

Very likely starts ticked

Caches, preferences, saved application state, logs, HTTP storage and cookies, and launch agents or daemons whose program is gone.

Likely

Application Support, containers, group containers, WebKit data, scripts, helper tools, plug-ins and other folders. These can hold things you made in the app, so check them.

Possible

Anything changed in the last 30 days, whatever it is. Something recent may belong to an app that is still around somewhere.

Point at a row to read the reason in full, for example "Named for com.spotify.client, and no installed app, package or helper comes from com.spotify."

Clearing them

1. Read the groups

   Items are grouped by the app they came from, largest first, under the app's icon and name when macOS still remembers it, or a name read from the identifier when it does not. Tags such as Setapp or App Store say where the app came from.

2. Choose what goes

   Select Very Likely ticks exactly the items Strata is sure about. A group's tick box ticks everything in it. Items tagged Password need an administrator: they are never ticked for you.

3. Move to Trash

   The confirmation sheet lists everything first. After it, Put Back returns the lot if something turns out to be missed.

Why apps leave these behind in the first place, and where each kind lives, is explained in Dragging an app to the Trash does not uninstall it.