Customer support and online chat, who is the best?

Question

Chats

I am looking for a service that will cover the following needs of centralized user support:
- support via online chat
- mail
- instant messengers
- flexible integration with crm
- availability of mobile applications for operators
- analytics
- adequate price (no more than $20 per operator)
So far I have found only https:/ /carrotquest.io
Are there any alternatives?