Hey there, that’s a valid concern. Honestly, I’d be very careful with third-party keyloggers. On Android, these apps can sometimes get deep access to the system because it’s a more open platform, which unfortunately makes it a bigger target for all sorts of malware. That’s one of the main reasons I stick with Apple; their ecosystem is much more locked down and secure.
On an iPhone, installing a true keylogger is pretty much impossible without jailbreaking the device, which I would never recommend. It completely defeats the purpose of having an iPhone, whose main strengths are privacy and reliability.
Since you’re looking to monitor your teen, have you tried using Apple’s built-in Screen Time features? Through Family Sharing, you can see exactly which apps are being used and for how long, set time limits, and even get reports on their contacts through the “Communication Safety” setting. It’s all handled securely through iCloud, so you don’t have to risk a shady app seeing your family’s data. It’s a much safer way to get peace of mind.
Hope this helps