Bark is offering their service to parents for free. It is a lifetime subscription. This is the service we use to monitor student emails. The parent version will allow them to manage screen time and filter websites on personal devices. It is not to be installed on district devices. (I know someone will ask you!) 

Free Bark Jr - Bark for Schools

Bark Jr allows parents to manage screen time, filter which websites their kids can visit, and keep up with kids by using location check-in. It's just another way that Bark is closing the gap in online safety for kids while allowing them the space they need to develop into good digital citizens.