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What is Reactif?

Reactif is a remote configuration tool built natively for .NET. It lets you push config changes to your running ASP.NET Core apps in under 10ms. Unlike other remote config tools that bolt on a .NET SDK as an afterthought, Reactif plugs directly into IConfiguration as a configuration source. That means everything you already use just works:
  • IOptions<T> and IOptionsMonitor<T> ->no new APIs to learn
  • Strongly typed config objects → no magic strings
  • Instant push via persistent SSE connection → no polling
  • Fallback to last known values if connection drops → your app never crashes

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The problem it solves

You have a feature that needs to be disabled immediately. Or a rate limit that needs adjusting. Or a kill switch that needs flipping. Without Reactif, that means a code change, a PR, a deploy, and downtime risk. With Reactif, it’s a dashboard click that propagates in under 10ms.

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What it is not

Reactif is not a secrets manager. Don’t store connection strings, passwords, or API keys in Reactif. Use Azure Key Vault or Infisical for that. Reactif is for runtime behavior config — feature flags, thresholds, toggles, values that change frequently and need to propagate instantly.

Quickstart

Get the SDK wired in under 5 minutes

Core Concepts

understand projects, environments, and keys

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