Yes, both Twilio Flex and Hellonext offer a Free Trial.
Twilio Flex is designed for Large Enterprises and Medium Business.
Hellonext is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Twilio Flex Starts at $1/User whereas for Hellonext Starts at $25/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 Hellonext includes Aha!, Jira, Productroad, ProdCamp, Fidlio, Backlogs, ProductFlare, Next Please, IdeaPlan and LaunchNotes.