No. Installing tools, adding widgets, adding home screen widgets, setting reminders, and backing up and restoring don't need an account. It all happens on your device.
You need to sign in to:
Sending feedback doesn't require signing in; if you'd like a reply, leave your contact details in the feedback form.
On a Mac, a Windows PC and other devices, you can sign in by scanning a code with a phone that's already signed in to Numable. See "Sign in on a computer and manage devices".