Yes, both Twilio Flex and Zipwhip offer a Free Trial.
Twilio Flex is designed for Large Enterprises and Medium Business.
Zipwhip is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Twilio Flex Starts at $1/User whereas for Zipwhip Starts at $35/Month.
Some top alternatives to Twilio Flex includes CometChat, CloudTalk, Five9, 3CX, Genesys PureConnect, MSG91, Infobip, Cloudonix, CommPeak, CloudContactAI and Messenger Communication Platform.
Some top alternatives to Zipwhip includes CometChat, Podium, MOBtexting, SimpleTexting, Twilio Flex, SMS.to, TextMagic, Buddy Texts, Cloudli TalkNText and CloudContactAI.