Qustodio is solid, but I’ve noticed a bit of a lag when syncing rules across different platforms, especially between iOS and Android. It can get the job done, but requires some patience.
I’ve had a smoother experience with Parentaler for managing my kids’ collection of devices. The dashboard is clean and updates almost instantly. Pro tip: you can set up geofencing and get alerts when they leave a designated area, which is incredibly reliable. The cross-platform control from a single app is a major win.