Remove application from Notification Center

I was stuck in the same boat.

While I don't believe purging applications from Notification Center that have once registered is a documented step, there's clearly some stuff setup to do that. Here's what I found out. This data isn't stored in a plist but rather a sqlite database.

If you look ~/Library/Application Support/NotificationCenter/<id> (in my case, I only had one directory under NotificationCenter), you'll see an <id>.db file under the directory.

^{Editor's note: Hofi points out that since macOS 10.10 said SQLite database can be found in the directory returned by shell command
$(getconf DARWIN_USER_DIR)com.apple.notificationcenter/db, named just db. jbg notes that as of macOS Monterey (12.x), the directory path is now $(getconf DARWIN_USER_DIR)com.apple.notificationcenter/db2, and the db database's app_info table has been renamed to app.}

Poking inside, I see tables like app_info, app_source, presented_notifications, etc. Furthermore, the schema includes a clean-up trigger that looks like this:

CREATE TRIGGER app_deleted AFTER DELETE ON app_info
BEGIN
    DELETE FROM scheduled_notifications     WHERE app_id=old.app_id;
    DELETE FROM presented_notifications     WHERE app_id=old.app_id;
    DELETE FROM presented_alerts                WHERE app_id=old.app_id;
    DELETE FROM notifications                   WHERE app_id=old.app_id;
    DELETE FROM app_push                        WHERE app_id=old.app_id;
    DELETE FROM app_loc                     WHERE app_id=old.app_id;
     DELETE FROM app_source                 WHERE app_id=old.app_id;
END;

Using a sqlite3 client, if you do a

select * from app_info;

the first column is the app_id of your application, the second column is your app's bundleid. Find your application based on the bundleid. Then do a

delete from app_info where app_id = <app_id>

where <app_id> is the correct app_id you found using your select command above.

What was frustrating was that after doing this, everything stayed around in NotificationCenter (both the center and System Preferences). I had to logout and log back in to see the changes take effect, but luckily, my multiple test apps are now gone ;-)

If anyone knows of a less convoluted way, I'm all ears.

If you delete the application (might need to empty the trash as well) and log out and back in, it gets removed from the list.

Highlight the app in the list and hit fn+backspace or del/delete if you have that on your keyboard.