Premium - purchase order purchase requested

We're happy to offer our Premium annual or lifetime membership for purchase by purchase order, for schools or other customers unable to pay by credit card. We do not accept credit cards for purchase orders and we do not accept purchase orders for the monthly plan. All prices are in USD.

Please note that payment for your purchase order must be received within 30 days of the invoice date. If payment is not received within 30 days, your Premium membership will be cancelled. 

Also please be aware that all subscriptions are sold for use by a single individual and the subscription you purchase may not be used by more than one person on your staff.  If you'd like multiple staff members to have access to a Premium membership, please create a separate line item on your purchase order for each individual.  

If these terms are agreeable to you, please fax your purchase order to 1-650-618-1528 or by email to The PO must include either an accounts payable email address or fax number, as well as your name and contact email address. Our address is: 401 E. Third Ave, San Mateo, CA 94401, USA. Phone:  650-362-4034.

Once the purchase order has been processed, we will email you instructions on how to activate your membership.

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