Open Source Courier Alternative

Why choose an open-source Courier alternative

Courier centralizes multi-channel notification delivery (email, SMS, push, in-app) behind a single API, but that API and the message data passing through it live entirely on Courier's infrastructure, billed by notification volume. A self-hosted notification platform keeps templates, subscriber data, and delivery logs on infrastructure the team runs, with no per-notification metering.

What to look for

A notification infrastructure layer needs a unified API across channels so application code doesn't branch per provider, a workflow engine for routing logic like channel fallbacks and digesting multiple events into one message, and enough provider integrations to avoid vendor lock-in on any single channel, whether that's email, SMS, push, or chat. Real-time delivery to an in-app inbox component matters too if the product needs an in-app notification center rather than only external channels.

Novu as a Courier alternative

Novu, licensed under MIT, provides a unified API across email, SMS, push, chat, and in-app notifications, backed by more than 50 provider integrations so a workflow can fail over from one provider to another without an application code change. Its workflow engine handles channel priority, fallbacks, digesting multiple triggers into a single delivery, and per-subscriber preference management, and an embeddable inbox component with real-time updates over WebSocket covers the in-app notification center use case directly. The self-hosted deployment runs the Novu API, worker, WebSocket server, and dashboard together, backed by MongoDB for persistent data and Redis for the delivery queue and caching, with unlimited notification volume since there's no metered API call to bill against.

Self-hosting shifts the operational burden from Courier's managed infrastructure to a team that now runs MongoDB, Redis, and Novu's own services, which is a fair trade for teams that want notification data off a third party's servers or need to send volume that would be costly under Courier's metered pricing.