Find your SQLite Database for Xcode 10

To get the SQLite database for your app on all simulators on which it’s installed:

find ~/Library/Developer/CoreSimulator/Devices -name MyAppName.sqlite

(Xcode 10)

Open Finder and do Shift + Cmd + G  to bring up the “Go to folder” dialog. Paste in the file path and you should see it. It will be garbled if you try to open it with a plain text editor. DB Browser for SQLite seems to work for me.