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PubNub offers Free Trial, but Socket.IO does not.
Socket.IO is designed for Individuals and Small Business.
PubNub is designed for Large Enterprises, Medium Business and Small Business.
The starting price of PubNub begins at $49/Month, while pricing details for Socket.IO are unavailable.
Some top alternatives to Socket.IO includes Pusher Channels, Google Chat, Trillian, Dialog, Office Chat, ChatCamp, MQTTCHAT, Pumble, SimpleLive and Distributed.
Some top alternatives to PubNub includes CometChat, Pusher Channels, Socket.IO, Plivo, Twilio Flex, MessageBird, SendBird, Infobip, SMS.to, ZEGOCLOUD and Messenger Communication Platform.
