Open Snapchat and go to the Chat screen
Look for a green dot next to their Bitmoji or profile icon
Check if their Bitmoji appears with an active status in Chat
See if their Snap Map location is updating in real time
Check whether they are replying quickly to your messages
Look for the “Typing…” indicator in the chat
Check if their Snap score is increasing when you refresh their profile
See if they recently viewed your Story or Snap
Check if their status changes from inactive to active in Chat
Remember that Snapchat does not always show exact online status