# Twilio

> Cloud communications and customer engagement platform offering messaging, voice, email, authentication, customer data and conversational AI APIs.

Twilio is a customer engagement platform that gives developers APIs for messaging, voice, email, user authentication, customer data and conversational AI. Its homepage describes a platform for humans and AI agents to coordinate across channels and continue each customer conversation where the last one left off. Developers can sign up for a free account and use official server-side SDKs to send a first text, call or email.

## What It Is

Twilio is a communications platform as a service (CPaaS) combined with customer data and AI building blocks. Its documentation groups the products into Conversations, Communications, Authentication, Customer Data and Builder Tools. Teams use the APIs to add channels such as SMS, WhatsApp, RCS, MMS, voice, SIP trunking, video and email to their own applications.

## Conversational AI and Memory

The Conversations family includes Conversation Memory, Conversation Orchestrator, Conversation Intelligence and Conversation Relay. Memory keeps persistent context from customer interactions across channels and sessions. Orchestrator keeps conversations connected as they move across channels or teams. Intelligence applies transcription and analysis to voice and messaging interactions. Conversation Relay is for building voice AI with natural conversation handling, including pauses, interruptions and routing. Twilio describes contextual hand-off in which AI agents transfer to a human with full context.

## Authentication and Customer Data

Verify provides a managed API for user verification over channels such as SMS, voice, WhatsApp, email, TOTP, push and passkeys. Lookup validates phone numbers and returns carrier, line type and identity information. On the data side, Twilio Segment products (Connections, Protocols, Unify, Engage and a Privacy Portal) unify first-party customer data, control data quality and run personalized cross-channel campaigns.

## Developer Tooling

The docs list server-side, front-end and mobile SDKs, a Twilio CLI, OpenAPI specifications, Postman collections, Functions and Serverless hosting, Studio (a drag-and-drop workflow builder), TwiML Bins and Code Exchange samples. A Building with AI section covers AI coding agents that understand Twilio's APIs. SDK languages shown on the homepage are Python, C#, PHP, Ruby, Java and JavaScript.

## Analyst Recognition

Twilio states it was named a Leader in the 2026 Gartner Magic Quadrant for CPaaS and positioned highest for Ability to Execute. It also cites leader placements from Omdia and IDC MarketScape.

## Features
- SMS, WhatsApp, RCS and MMS messaging APIs
- Programmable voice, SIP trunking and Conversation Relay voice AI
- SendGrid email API and SMTP service
- Conversation Memory, Orchestrator and Intelligence
- Verify user authentication and Lookup phone intelligence
- Segment customer data platform (Connections, Protocols, Unify, Engage)
- Flex contact center and TaskRouter skills-based routing
- Studio visual workflow builder and serverless Functions
- Official SDKs, Twilio CLI and OpenAPI specs
- Phone numbers including toll-free, 10DLC and short codes

## Integrations
WhatsApp, RCS, SendGrid, Segment, Postman, Twilio Marketplace partners

## Platforms
WINDOWS, WEB, API, DEVELOPER_SDK, CLI

## Pricing
Paid

## Links
- Website: https://www.twilio.com
- Documentation: https://www.twilio.com/docs
- EveryDev.ai: https://www.everydev.ai/tools/twilio