R – Do “Product Name” and “Bundle Display Name” have to match

If you look at an info.plist, it goes something like this:

Bundle Display Name - ${PRODUCT_NAME}
Executable File - ${EXECUTABLE_NAME}
Bundle Name - ${PRODUCT_NAME}

So you can see, that normally PRODUCT_NAME gives you the same name for the bundle and what the user sees.

In some cases you may want a more complex display name that is not suitable for naming things like bundles or executables, which is why you can change them independently - but you don't have to. The default is that PRODUCT_NAME is the same name as the project name, but you can also override it in the build settings.

You shouldn't be changing the way they are set up in info.plist, unless you have a very good reason... just change PRODUCT_NAME.

I don't think any of the other answers concisely answers the question.

• CFBundleDisplayName - displayed: below icon. According to docs, should be localized, but only if the app itself is localized, otherwise there will be some kind of penalty (if this is true in reality I cannot say)

• CFBundleName - displayed: I have no idea. Docs suggest that it will be used in lists thus recommended max 16 characters, but for instance the Settings→General→Usage list of apps uses CFBundleDisplayName really. To date I have never figured out where exactly this one is used.

Oh, this is for iOS apps, can't speak for other OSes.