Vonage is a global cloud communications (CPaaS) platform under Ericsson, with SMS coverage across 190+ countries and voice across 60+ countries, offering SMS, voice, Verify 2FA, video, and omnichannel messaging APIs with a 99.99% SLA.
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Twilio is a cloud communications API platform (CPaaS) founded in 2008 in San Francisco and listed on the NYSE in 2016, covering 180+ countries. SMS is about $0.0079 per segment and voice about $0.013 per minute, with SendGrid acquired in 2019 and Segment in 2020.
Amazon Chime is the online meeting, video conferencing, and business messaging service launched by AWS in 2017; Basic is free, Pro is $3/user/month for up to 100 participants, and SDK plus Voice Connector deeply integrate with the AWS ecosystem.