List of Supported IM for Android
You can conceivably monitor any IM using FlexiSPY's IM Capture Modes.
However, below are a list of the IMs you can see captured in the IMs panel in your portal. 
For Non-Rooted Android Devices
- See full list here
For Rooted Android Devices
- Facebook Messenger
- Google Hangouts
- KiK Messenger
- LINE
- Skype
- Telegram
- WeChat
- Yahoo Messenger
- Tinder Messages
- QQ Messenger
- Instagram Messages
- Hike Messenger
- Viber Messages
- WhatsApp Messages