Let's find a third-party app that works best with QuickBooks Online (QBO), @pam41.
There are lots of apps that works perfectly with QuickBooks Online. You can proceed to the following steps to search for one.
From your QuickBooks Online home page, click on the Apps from the left menu. Once done, you can click the Find Apps tab to look for specific apps.
You can check this article for more information: Find apps. Also, see this article on how to install and use apps in QuickBooks Online Accountant.
I'm always here if you need more help in looking for the perfect app that suits your needs. Take care and have a wonderful day!