The excellent news for the punters who want to put NetNanny to the test is that they can take advantage of the 14-day trial. If you want the 5-device deal, you will pay 55$ per year. The cost for one computer (Windows or Mac) is 40$ per year, while the 20-device family protection pass costs 90$ a year. At times, you may find a NetNanny voucher code to get a discount or deals, even for protecting only one device.