I thought this was a free app for a month at least

Is this app not offered for free for a trial period?

Hi there - It is. I can see that you're already registered for a FREE account.

Your account is FREE to use and will never expire. There are only certain usage limitations for FREE plan which you can see here.

Related Guide: Understanding-Your-Account-Usage-and-Limits 

If you need further assistance, please let us know.