Twilio

Twilio is a cloud communications platform (CPaaS) for developers, product teams, and enterprises that need to embed messaging, voice, email, video, authentication, and AI-driven conversations into web and backend applications via APIs.

Key capabilities include:

• Messaging APIs for SMS, MMS, WhatsApp, and RCS, plus Conversations API to manage multichannel threads
• Voice APIs for programmable calling, IVR, conferencing, call tracking, and SIP trunking, with access to phone numbers in 100+ countries
• Email delivery through SendGrid Email API and SMTP services for transactional email at scale
• Authentication and identity with Verify (OTP/2FA) and Lookup tools
• Video API for real-time video applications (up to 50 participants)
• Conversational AI for virtual agents and conversation automation, plus Conversational Intelligence
• Twilio Flex for building a customizable contact center
• Customer Data Platform capabilities (via Twilio Segment) to unify first-party data for real-time customer insights

Pricing: Free trial available; pay-as-you-go pricing with volume discounts.

Notable for combining communications APIs, customer data, and AI in one platform used by 10 million developers and 335,000+ companies, and for being named a .