Yes, both MQTTCHAT and Twilio Flex offer a Free Trial.
MQTTCHAT is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Twilio Flex is designed for Large Enterprises and Medium Business.
Pricing for MQTTCHAT Starts at $5/Month whereas for Twilio Flex Starts at $1/User.
Some top alternatives to MQTTCHAT includes CometChat, ChatCamp, Chatpage, Twilio Flex, ConnectyCube, SupportChamp, Closer, CloudContactAI and Messenger Communication Platform.
Some top alternatives to Twilio Flex includes CometChat, CloudTalk, Five9, 3CX, Genesys PureConnect, MSG91, Infobip, Cloudonix, CommPeak, CloudContactAI and Messenger Communication Platform.