How to Uninstall OmniOutliner on Mac

Find the outline documents you want to keep in Finder or the document browser before removing OmniOutliner. Keep native files when styles or attachments matter; an OPML export is not a full replacement. The recorded test used a direct download, not a Homebrew installation.

Remove the app and inspect its data

Quit OmniOutliner, then move its app from Applications to Trash. Do not remove OmniFocus files or a shared Omni group merely because the products have the same vendor. The exact container and scripts belong to the app. Documents may be in user-chosen folders or cloud storage; verify their actual location before removing local state. Vendor guidance.

Check the result

ls -ld ~/Library/Containers/com.omnigroup.OmniOutliner6 ~/Library/'Application Scripts'/com.omnigroup.OmniOutliner6

Run this read-only check after quitting the app. A printed path still exists; “No such file or directory” means that path is absent, while a permission error needs its own investigation.

If you installed it with Homebrew

The Homebrew cask has a zap list that includes OmniOutliner scripts, containers and recent-document state, not OmniFocus data. Run the command below without --zap if you want to keep those files and inspect them separately. A manual --zap follows the whole cask list regardless of Mole’s checkboxes. Mole uses zap only when its targets are selected, owned and within the checked boundary; otherwise it removes selected remnants through its own flow.

brew uninstall --cask omnioutliner

What Mole lists

Exact OmniOutliner container and scripts are normally selected. The installed OmniFocus sibling group is protected and not an OmniOutliner-only remnant.

What this test covered

Official-package OmniOutliner 6.3 was removed on September 20, 2026. The OmniFocus group stayed; no real outline or cloud account was created for recovery testing.