Novu is an open-source communication infrastructure platform that helps products and AI agents reach users across every major channel. It supports in-app notifications, email, SMS, push, chat, Slack, Microsoft Teams, Telegram, and custom channels from one unified system. Developers can add a notification inbox to an application with a lightweight component and scale into full workflow orchestration when needed. Novu includes user preferences, snooze, real-time delivery, digesting, workflow automation, and a block-based email editor powered by React Email. Its Novu Connect product helps AI agents communicate with users across channels such as Slack, email, Discord, and more. With open-source tooling, integrations, and a free plan, Novu helps teams build flexible notification and agent communication systems without starting from scratch.