Segment is the pioneer of the customer data platform (CDP) category, founded in 2011 in San Francisco, California, USA, and acquired by Twilio for $3.2 billion in 2020, routing customer events to 400+ destinations through a single API across Connections, Protocols, Engage, and Unify.
SendGrid Email is Twilio's email delivery API product processing billions of emails daily, featuring v3 API, SMTP relay, delivery analytics, dynamic templates, and sender reputation management.
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.
Twilio SendGrid was founded in 2009 and is headquartered in Denver, USA, as an email sending API and marketing platform processing 80B+ emails daily. REST API and SMTP integration serve startups to Fortune 500 companies.