I understand your concern about Snapchat’s disappearing messages. Rather than trying to capture them secretly, I’d suggest a more direct approach that builds trust:
Consider using Apple’s built-in Screen Time features combined with regular check-ins where your child shows you their Snapchat friends list and recent conversations. Many parents also find success with apps like Bark or Qustodio that monitor for concerning content without being overly invasive.
Most importantly, have open conversations about online safety. Let your child know you’re monitoring to keep them safe, not to spy. This transparency often leads to better communication about their digital life than secret monitoring ever could.