I use Android, and it has Family Link. Basically parents can (remote) control their kids' phone. No 3rd party app required.
You can set very granular things, like which apps they can open, for how long, and what permissions are allowed. For app installs, the parents can remote-approve it, or allow kids to download only free apps (not good idea).
You can see adjust the restrictions on the fly, like oh you've done your homework, I'll give you extra hour. You can see usage report.
My kids are still using it to watch youtube. So I'm not successful yet.
You can set very granular things, like which apps they can open, for how long, and what permissions are allowed. For app installs, the parents can remote-approve it, or allow kids to download only free apps (not good idea).
You can see adjust the restrictions on the fly, like oh you've done your homework, I'll give you extra hour. You can see usage report.
My kids are still using it to watch youtube. So I'm not successful yet.