Yes, both Exotel and Twilio Flex offer a Free Trial.
Exotel is designed for Large Enterprises, Medium Business and Small Business.
Twilio Flex is designed for Large Enterprises and Medium Business.
Pricing for Exotel Starts at $1,000 whereas for Twilio Flex Starts at $1/User.
Some top alternatives to Exotel includes Nextiva, Knowlarity, CloudTalk, Servetel, Call Center Studio, TelebuHub, CallFire, VCC Live, Ozonetel CloudAgent, VoiceIQ and Twilio Flex.
Some top alternatives to Twilio Flex includes CometChat, CloudTalk, Five9, 3CX, Genesys PureConnect, MSG91, Infobip, Cloudonix, CommPeak, CloudContactAI and Messenger Communication Platform.