Login to Zoho Forms iOS App with Google Apps account

I login to my Zoho CRM (web and mobile) with my Google Apps account. I am trying out Zoho Forms now. I was able to get into it on the web with my Google Apps account, but when I downloaded the iOS app I don't see an option to login with a Google Apps account. Can anyone help? I tried using my email and password for Google Apps and that didn't work.