That may not be the best way to maintain personal security, but with individual user spaces, similar application installations, and iCloud for data backup and synchronization, it works for all four of us (two seemingly adults, two obviously teenage children). If you have a few shared Macs, here’s another way to lock down apps you don’t want others to use.
The Lock It Up App Locker
OS X Yosemite, El Capitan, and macOS Sierra have some wonderfully secure options but many of them are hidden. AppLocker is a handy Mac utility which lets you apply a lock on specific applications so they cannot be used. This is useful on a Mac that is shared.
In short, AppLocker locks apps.
This has to be one of the simplest to use security apps I’ve ever installed on my Mac. There’s almost no configuration whatsoever. Install the app from the App Store. Open it up. Add a password. Select the apps you want to lock from the list.
If someone tries to use one of the applications you checked in AppLocker, they’ll get a pop up window which says the app is blocked. Unblocking it requires the password. This makes AppLocker a useful tool for families and office environments where Macs are sometimes shared.
Couldn’t you just use a Guest User account instead? Yes, but that allows them to use specific apps and the Parental Controls in System Preferences is not as detailed as AppLocker.
What would be really handy is to have a single control panel for all users on a Mac. As it is now, if your Mac is shared by others, AppLocker would need to be set up for each user. That’s a bit tedious, but ultimately the best method to prevent other users on the same Mac from using apps you prefer they not use.
Again, there’s not much to AppLocker other than a very good initial security level to prevent anyone from using an app without the password. I could also see an advantage in setting a different password for each app, or a specific password for each user, but that starts to complicate the process.
Otherwise, AppLocker is priced right, adds an extra layer of security to prevent Mac users from accessing documents by preventing access to their respective apps.