Is there a specific app to use just for payroll, or is it in with the regular app?

Hi there, maplewood-lsp-gm!

Welcome to the QuickBooks Community! Thank you for asking about a payroll app. I'll provide information about it.

As of the moment, we don't have a mobile app that can be used to run payroll in QBO. You can, however, sign in to your QBO company using a mobile browser to run payroll if you're not able to use a computer at certain times.

If you need more help with running payroll, feel free to go back to this thread. You can also check out the helpful articles for your additional references.