Unfortunately, Snapchat can be monitored only if the iPhone is jailbroken. Please, be advised that full untethered jailbreak for iOS version 9.2 - 12 has not been released yet. Basically, it means that no iPhone updated to the recent iOS version can be jailbroken.
At the moment with our solution for iOS devices you can monitor the following:
- Call logs
- Text messages ( including iMessages )
- Browser history
- Wi-Fi Networks
- Installed applications list