Here is a list of some of the best 1v1 chat apps for Android and iOS platforms:

1. Emerald Chat – Great for connecting privately.
2. 1v1Chat – Specifically designed for one-on-one conversations.
3. Monkey App – A fun way to chat with others.
4. Skype – Well-known and reliable for personal and professional chats.
5. Holla – A lively app for making new connections.
Make sure the app you choose is legit and stay safe before starting a conversation with others. Some of the applications contain offensive words or even users within them. Use all the internet applications wisely.