Every chat, dashboard, or CMS eventually needs a green dot next to a name. Most teams build it twice: once for “is this person online”, once for “who else is looking at this document” — and get the multi-tab and multi-pod edge cases wrong both times. Here’s the primitive that replaces both.
W3C Web Push lets the browser ring even when your tab is closed. With VAPID you do it without FCM, without APNs, and without a single US-hosted dependency. Here is the .NET 10 side, the React hook, and the 30 lines of service worker that ties them together.
One PublishAsync call, nine delivery channels. How Granit fans out a single notification to email, SMS, WhatsApp, mobile push, web push, SignalR, SSE, Zulip, and the in-app inbox without rewriting your domain code.
.NET 10 makes SSE a first-class citizen with TypedResults.ServerSentEvents(). Build a complete real-time notification stream from HTTP primitives to React hooks — no WebSocket plumbing required.
SSE, SignalR, or raw WebSockets? A practical decision framework for .NET real-time applications, with protocol deep-dives, trade-offs, and ready-to-use Granit code samples for each transport.
