How to uninstall OmniPlan on Mac
Use OmniPlan File › Save for each open project and copy the resulting project files to a location you control. Open the copies before removing anything. If projects are published to a server repository or calendar, confirm their separate server copy; the app icon does not prove the repository is intact.
The recorded test used the official Mac package; the Homebrew route below is separate.
Remove the app
Quit OmniPlan and move OmniPlan.app from Applications to Trash. Keep the saved project files wherever you placed them. Other Omni apps may still use Omni account or shared vendor state, so do not remove an Omni Group parent directory.
Review local data
The path below is documented in the current Homebrew cask. In Finder, use Go › Go to Folder to inspect it. Do not remove its parent directory or another product’s data.
| Location | Decision |
|---|---|
~/Library/Containers/com.omnigroup.OmniPlan4 |
App container named by the cask. Review its contents before deleting; project documents may be stored outside it. |
The tested package uses bundle ID com.omnigroup.OmniPlan4. Review only files that actually appear on this Mac. A missing path needs no cleanup.
Check what remains
Run these read-only commands after quitting the app:
pgrep -il 'OmniPlan'
ls -d "$HOME/Library/Containers/com.omnigroup.OmniPlan4"
No process output means there is no matching process running now; it does not prove every helper is gone. A listed process needs its owner checked. If ls prints the path, that item remains and needs review. “No such file or directory” means this path is absent; a permission error means its state was not established.
If you installed it with Homebrew
The current omniplan cask has a zap list covering the OmniPlan 4 container, application scripts, preferences and recent-documents list. A direct brew command with --zap applies the cask list without consulting Mole’s checkboxes. After backing up, use this command without --zap:
brew uninstall --cask omniplan
Mole checks each zap path against your selections, other installed apps, and protected locations. An unchecked, shared, or unverifiable path suppresses --zap; selected remnants can still use Mole’s own removal flow. This cask was not the recorded installation channel.
What Mole lists
Mole lists exact OmniPlan 4 bundle-ID support, container and preference matches when present. The exact support and container rows are selected by default; uncertain display-name or sibling-app rows stay for review or are protected. A checked row is not a project backup.
What this test covered
The official DMG build 4.11 was installed and removed on September 20, 2026, with review rows selected. The test did not sign in or create a project, so it cannot establish the fate of a populated project repository.