To use the Quick Entry with Autofill feature on your Mac, you need to install a small Helper application.
Please note that this page is for Things 2. If you’re looking to install the Things Helper for Things 3, see this page.
Apple now require developers to “sandbox” their applications – as a result, we could no longer implement our Quick Entry feature the same way we had in previous versions of Things Mac.
The new Things Helper application runs in the background and is used by Things to perform Autofill during quick entry. When you first turn Autofill on, it will prompt you to download the Helper application; when you turn it back off, the Helper application is automatically uninstalled for you.