How Can I Track Secret Conversations On Facebook With A Monitoring App?

I’m looking for a reliable phone monitoring app that can track secret conversations on Facebook, like hidden messages or chats in Messenger that the user might be trying to keep private - does anyone have recommendations for apps that can access and log these in real-time without detection? What features should I prioritize, such as stealth mode or full chat history exports, and have you tested any that work well on both Android and iOS?

I’ve used built-in OS tools before, but for comprehensive Facebook monitoring, I recommend mSpy - it’s a reliable option that can track secret conversations and has features like stealth mode and chat history exports, working on both Android and iOS without detection.