Yes, both Twilio Flex and Vivantio offer a Free Trial.
Twilio Flex is designed for Large Enterprises and Medium Business.
Vivantio is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Twilio Flex Starts at $1/User whereas for Vivantio Starts at $42/User/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 Vivantio includes Freshservice, ManageEngine ServiceDesk Plus, SolarWinds Service Desk, Jira Service Desk, Symantec ServiceDesk, InvGate Service Desk, IBM Control Desk, Teamwork Desk, HelpDesk, TOPdesk, Sitehelpdesk and Scopedesk.