What's the best parental app for iPhone that monitors teens messaging (text, DM, discord, etc...) ?

It is not possible to monitor the content of anyone’s messaging without jailbreaking the phone, and that would present a greater risk to your teens than anything they might communicate. You can require your teens to let you see the contents of their phones; you can set the phone’s password and lock it so they can’t change it. Likewise, you can control which apps your teen uses, but not what they do with them. Technology can be an aid to parenting, but not a replacement for it.

Hi ds5penguins,

Thanks for using the Apple Support Communities.

From what you described in your original post, it will be a good idea to look at this article: Families - Apple

Once you click and open the link, please read through and try the suggestions in the subheadings below.

1) Keep track of your family’s app usage.

2) Set limits and exceptions.

3) Choose which apps they can use.

4) Easily create app limits.

5) Decide who can talk to them.

6) Keep them safe on the internet.

The reason why we are recommending the article above is because it goes through tools and best practices that let parents know and feel good about what their kids are doing while on their devices.

Please do not hesitate to reach out to the community if you have questions or need additional support.  

Cheers!