SendHub vs Viber

Twilio

A cloud communication platform, which brings voice, telephony, SMS, and messaging functionality to your app

Plivo

A communication platform for global voice and messaging applications

RingCentral

A cloud-based business communications solution that include message, video, phone, and contact center services

Google Voice

Telephony

Aircall

Cloud-based call center software for customer-centric teams

Telegram

Cloud-Based Messaging App with Focus on Speed and Security

WhatsApp

Messaging app by facebook

Discord

A modern service for group voice, video, and text communication

Hangouts

Video Conferencing

Skype

Communication solution with voice, video, messaging, and file transfer