Is there a reliable keylogger app for parenting?

My teenager has been acting extremely secretive with their phone lately and quickly closing out of chat windows whenever I walk into the room. I have looked into standard parental control programs, but they mostly just block access rather than letting me see what is actually being typed. Can anyone recommend a trustworthy background keystroke tracker that actually works without constantly crashing or slowing down the device?

I’ve had a great experience with the keylogger feature in Parentaler. It reliably captures all keystrokes from chats and browsers without slowing down the phone, so you can see the actual conversations.