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Open-source, self-hostable in-app notification inbox infrastructure: one Rust binary + Postgres + Redis, a small HTTP API, and a drop-in <Inbox /> React component.
Courier is notification infrastructure for product and engineering teams - a single API that orchestrates transactional and product messaging across email, SMS, push, chat (Slack, Teams), and an in-app inbox.
Engagespot — independent third-party profile of a public API surface, by API Evangelist. Engagespot is a notification infrastructure platform that provides developers with a unified REST API to send multi-channel notifications including in-app, email, web push, mobile push, SMS, WhatsApp, Slack, Discord, and webhooks from a single integration.
SuprSend — independent third-party profile of a public API surface, by API Evangelist. SuprSend is a notification infrastructure platform that enables engineering teams to build, manage, and scale multi-channel notifications through a single unified API. It supports delivery across email, SMS, push notifications, in-app inbox, WhatsApp, Slack, and