Novu

Novu is an open-source notification and agent communication platform that enables products and AI agents to reach customers across multiple channels, including in-app, email, SMS, push, WhatsApp, Slack, Microsoft Teams, and Telegram, through a unified API. It offers Novu Notify, multi-channel notification delivery with inbox components, digests, and rate limiting, and Novu Connect, two-way AI agent communication with conversation context, human-in-the-loop approvals, and channel integration. Novu includes a unified workflow engine handling routing, conditions, and fallbacks across channels, and supports both self-hosted and fully managed deployment options. The platform reports 1.5 billion messages sent in a recent month, with enterprise customers including MongoDB and Check Point. Pricing is open source: the self-hosted option is free on GitHub, with a fully managed cloud option also available for teams that prefer not to operate their own infrastructure.