Yes, both Twilio Flex and MightyCall offer a Free Trial.
Twilio Flex is designed for Large Enterprises and Medium Business.
MightyCall is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Twilio Flex Starts at $1/User whereas for MightyCall Starts at $15/user/month when yearly.
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 MightyCall includes CloudTalk, RingByName, Dialpad Talk, VoIPstudio, RingCentral Office, Vodia PBX, Grasshopper, Voxloud and Ringover.