Net Nanny 1-Device Annual Subscription Desktop (Mac/PC only): Parental Control Software and Internet Filter This 1-device annual subscription is available for Mac/PC only at this time Flexible filtering: control which content can be seen with comprehensive parental control software Block porn instantly: warn or block access to pornography and other adult content Prevent cyber bullying: monitor social media activities and promote internet safety Limit time online: control the time of day or set number of hours your child can be online