I highly recommend Qustudio. It works on phone and PC, and allows you to customise exactly what is monitored or blocked so you can keep an eye on things in an age appropriate way.

We started monitoring after we found out our 12 year old daughter was catfishing a 19 year old boy. He had no idea and after we explained that she could literally ruin his life, and made her tell him her age he noped out of there. (Wisely.)

At first we had it set to monitor everything, report all searches, all app downloads, block porn, etc.

Yes she was able to get around certain features, like when she was young we had the phone locked past midnight… But it logs when it’s in use, so we then had a talk the next day and took away the phone or PC if needed.

As she got older we removed the block on all websites, and stopped monitoring any messages. We kept the software on to let us know when she was using her devices because she would often be up until 3am on her phone on a school night and we would then have a conversation about it.

We removed it when she was 17 or 18.