Courier

Courier is a customer messaging platform that orchestrates notifications and lifecycle journeys across every channel for both human teams and AI agents. The platform unifies notification infrastructure, customer journey orchestration, design studio, and in-app notification centers into a single product. Developers integrate through REST APIs, SDKs for Node.js, Python, Go, Ruby, PHP, and Java, and drop-in UI components for React, JavaScript, iOS, Android, React Native, and Flutter. The Model Context Protocol server enables AI agents in Claude Code, Cursor, and Codex to compose, send, and monitor notifications programmatically, with native support for GPT-5.4 and Claude Opus 4.6 models embedded in journey workflows. Over 50 provider integrations include SendGrid, Twilio, Amazon SES, Resend, APNs, Firebase Cloud Messaging, Slack, Microsoft Teams, and WhatsApp, with automatic failover and delivery tracking. The Design Studio provides a multi-channel visual editor with live preview across all channels on a single canvas, enabling non-technical teams to ship notification content without code. Enterprise case studies demonstrate measurable returns. Twilio, handling nearly one trillion digital interactions annually across 300,000 customers, uses Courier for internal developer notifications. Nav serves 2.7 million-plus small businesses with real-time banking and credit notifications. Trusted Health connects 3,000-plus healthcare facilities with nurses, achieving 95 percent contract completion rates through automated reminder journeys. Security features include encryption at rest and in transit, regional data residency controls, role-based access, and audit logs.