Billing Policy

Version 1.0 – June 2018

This policy outlines how Sero! determines fees and charges, and performs billing. 


Your Sero! account is a paid subscription that entitles you to all of Sero!’s current and future featuers. You may cancel it at any time.

Charge Frequency

We charge once per month, unless we determine your account is at risk of non-payment, in which case we may require that you pay for an annual subscription in advance.

Unless you cancel your Sero! account, we will continue to charge for your subscription every month on the anniversary of your first purchase.


Sero! prices are denominated in United States dollars.

Late Payments

Late payments stemming from an inability to charge to the credit card on file may bear interest at the rate of 1.5% per month (or the highest rate permitted by law, if less) determined and compounded daily from the date due until the date paid. You will reimburse any costs or expenses (including, but not limited to, reasonable attorneys’ fees) incurred by Sero! to collect any amount that is not paid when due. Amounts due from you under may not be withheld or offset by you against amounts due to you for any reason.


Other than federal and state net income taxes imposed on Sero! by the United States, you are responsible for paying all taxes, duties, and other governmental charges (“taxes”), pursuant to the Sero! Terms of Service. You will pay any additional amounts as are necessary to ensure that the net amounts received by Sero! after all such taxes are paid are equal to the amounts that Sero! would have been entitled to if the taxes did not exist.

Changes to Billing and this Policy

Any changes to this policy will be posted on this page and may not be provided directly to current subscribers. Sero! Learning Assessments may change subscription rates. Subscribers will be notified of any changes to subscription rates, with the option to cancel subscription effective immediately. 

Return to Sero! Terms of Service.