# SignalR/SignalR

Incredibly simple real-time web for .NET

Repository: https://github.com/SignalR/SignalR
Canonical: https://ross.abutalabs.com/products/signalr
Homepage: http://signalr.net
Language: C#
License: NOASSERTION
License Family: other
Topics: signalr, c-sharp, asp
Last push: 2025-09-18T16:42:20+00:00

## Health v2 (maintenance only)
Score: 42/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 42, release rhythm 8, longevity 100
- inputs: {"age_days": 5521, "days_push": 349, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 9402, forks 2247 (observed 2026-08-28T04:10:31.038834+00:00)

## What it is
ASP.NET SignalR is a .NET library that makes it simple to add real-time web functionality to ASP.NET (System.Web/Katana) applications, letting server-side code push content to connected clients instantly. It abstracts transports like WebSockets and long polling behind a simple hub programming model.

## Use cases
- push live updates from server to browser clients
- build a real-time chat application in ASP.NET
- stream dashboard or monitoring data without page refreshes
- implement high-frequency updates for real-time games
- replace ajax long polling with a simpler push model
- broadcast notifications to all connected clients

## When to choose
- you maintain a legacy .NET Framework / System.Web or Katana ASP.NET app that needs real-time push
- you want a simple hub-based RPC model for server-to-client messaging
- you need automatic transport fallback (WebSockets, SSE, long polling)

## When to avoid
- you are starting a new project - use ASP.NET Core SignalR instead, as this repo is in maintenance mode with no new features
- you need a managed, scalable hosting option - consider Azure SignalR Service
- your stack is not .NET

## Facets
- artifact type: library
- maturity: maintenance
- function: websocket, rpc, web-framework, middleware
- domain: web-development, backend, apis
- platform: dotnet, windows
- tags: real-time-web, server-push, aspnet, long-polling, hubs, dotnet-framework, legacy, real-time, linux, macos, web-server

## Member repositories
- SignalR/SignalR (main) score 42

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:31.038834+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:22:10.983013+00:00, confidence not recorded.
  - readme: https://github.com/SignalR/SignalR (fetched 2026-08-28T04:10:31.038834+00:00, sha 737a35187dd6)
  - homepage: http://signalr.net (fetched 2026-08-29T08:22:21.956802+00:00, sha 3ae3fbca330d)
  - site_page: https://learn.microsoft.com/docs (fetched 2026-08-29T08:22:21.968256+00:00, sha f29800be2b9a)
  - site_page: https://learn.microsoft.com/en-us/dotnet (fetched 2026-08-29T08:22:21.965813+00:00, sha efa9016b58aa)
  - site_page: https://learn.microsoft.com/aspnet/core/signalr/introduction (fetched 2026-08-29T08:22:21.970265+00:00, sha 510fd11cbd48)
  - site_page: https://dotnet.microsoft.com/en-us/apps/aspnet/signalr/service (fetched 2026-08-29T08:22:21.972141+00:00, sha 9c43425507e8)
- Data as of 2026-08-30T08:39:29.467469+00:00.