Twilio ranks #1 in Communications APIs AI search.

Twilio is a publicly traded (NYSE: TWLO) cloud communications platform founded in 2008 and headquartered in San Francisco, CA. It provides developer-first APIs enabling businesses to embed voice, SMS, RCS, WhatsApp, email, video, and authentication into applications without managing telecommunications infrastructure. Twilio's platform spans CPaaS (Communications Platform as a Service), a programmable contact center (Twilio Flex), transactional and marketing email (SendGrid), user authentication (Verify/Lookup), and a Customer Data Platform (Segment). In FY2025, Twilio reported $5.07B in revenue with 402,000+ active customer accounts and a 10M+ developer ecosystem. Named a Leader in the Gartner Magic Quadrant for CPaaS for three consecutive years, Twilio is the dominant incumbent in the Communications APIs vertical.

Twilio is a cloud communications platform-as-a-service (CPaaS) that exposes carrier-grade telephony, messaging, and email infrastructure through developer-friendly REST APIs and SDKs. Its core product suite includes programmable SMS/MMS/RCS/WhatsApp messaging, Voice APIs (calls, SIP trunking, IVR, conferencing), the SendGrid Email API, Twilio Verify for user authentication, Twilio Flex (a fully programmable contact center), and Twilio Segment (a Customer Data Platform). More recently, Twilio has layered in Conversational AI products including ConversationRelay for deploying voice AI agents and Conversational Intelligence for call transcription and analysis. The platform serves over 402,000 active customer accounts and 10M+ developers, processing 27.9B+ voice calls, 193B+ messages, and 2.2T+ emails annually.