When comparing Nektony App Cleaner & Uninstaller vs AppTrap, the Slant community recommends Nektony App Cleaner & Uninstaller for most people. In the question“What are the best app uninstallers for Mac OS X?” Nektony App Cleaner & Uninstaller is ranked 3rd while AppTrap is ranked 8th.
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Pros
Pro It uninstalls apps completely
Pro Clean clear interface, quick sensible price
Pro It mostly works
Most of the time it works fine, the user interface is very good and it certainly removes more items than a user would have done by simply dragging the app manually to the wastebin, along with any extra files found simply using intuition.
Pro Prefpane style app
AppTrap installs a daemon that runs in the background monitoring the trash, when you drag an app to the trash it will search for associated .plist files that have been left behind and ask to move them to the trash. In other words, AppTrap launches and does the work for you automatically. All you have to do is uninstall apps the old fashioned mac way by dragging apps to the trash.
Cons
Con Company does not honour previous "one-time" purchases.
Apparently, for this company, the term "one-time" means "until we decide to change the version number and re-charge you"! A previously bought Pro license for the previous version of the application worked fine for a couple of years until upgrading to macOS Big Sur. The previous version no longer worked and the application wanted to install the latest one. The app no longer accepted the original license key, saying that it was valid only for the "old" version and prompting the purchase a new license, at full cost ($19.90, €21.90) obviously.
Con Not always working properly
The app failed to clean up all remnants when trying to remove a full installation of Xcode, found out after trying to re-install just the Developer CLI tools and the installation would fail by stating that Xcode is already installed. The situation was resolved by following a guide found on Github for manually removing Xcode, which fortunately worked.
For certain applications whose installation is tightly coupled to the operating system, the "App Cleaner & Uninstaller" app should detect them and use specifically customized unistallation scripts, instead of relying on their generic scanning algorithms only.
Con Not Supported in Big Sur
Con Gets some things, not everything
This is thorough enough in cleaning up most of the cruft that gets left behind by applications, but might not get everything for the more invasive applications, especially if some of the files have privileged permissions.
Con Requires using Finder
Does not work if you trash app using alternate file browser like Path Finder.