🚀 Feature Flags Flutter SDK

Lightweight, fast, self-hosted feature flag SDK for Flutter apps. Toggle features remotely without rebuilding your app.

Works with the Feature Flags Backend + Dashboard you built.

✨ Features

  • 🔑 API key based authentication
  • ⚡ Fast flag fetch
  • 💾 Local cache & offline fallback
  • 🔁 Auto refresh (polling)
  • 🧠 Simple API (isEnabled)
  • 🧩 Works with any Flutter app
  • 🌍 Supports multiple environments
  • 🔒 Secure (hashed keys, no secrets stored)
  • 🚀 Production ready

📝 Sign Up for API Key

To get started, sign up at Feature Flag Dashboard to obtain your API key. After signing up, you can create feature flags on the dashboard to use in your app.

📦 Installation

Add to pubspec.yaml:

dependencies:
  feature_flags: 0.0.2

🚀 Quick Start

1️⃣ Initialize SDK

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  await FeatureFlags.init(
    apiKey: "YOUR_API_KEY",
  );

  runApp(MyApp());
}

2️⃣ Use flags anywhere

if (FeatureFlags.isEnabled("new_home")) {
  return NewHome();
} else {
  return OldHome();
}

🔄 Live updates

Flags are refreshed automatically (every 30s by default).

To manually rebuild UI:

setState(() {});

or any state management packages that u prefer

🧠 Fallback values

FeatureFlags.isEnabled("new_home", fallback: false);

📴 Offline support

If network fails:

  • last known flags are used
  • app never crashes
  • perfect for production

⚙️ Configuration

Change refresh interval

await FeatureFlags.init(
  apiKey: "...",
);

🔒 Security model

  • SDK uses API keys, not JWT
  • Keys are scoped to environment
  • Backend stores only hashed keys
  • Raw keys shown only once
  • Safe to ship in production apps

🧩 Example

Text(
  FeatureFlags.isEnabled("new_home")
    ? "New UI"
    : "Old UI",
);

🛑 Dispose (optional)

FeatureFlags.dispose();

🧠 Roadmap

  • Stream updates (no rebuild)
  • Widget builder
  • Percentage rollout
  • User targeting
  • Android SDK
  • iOS SDK
  • React SDK
  • Web SDK

🏆 Why this exists

This SDK is:

  • fast
  • simple
  • self-hosted
  • cheap - free for now
  • perfect for indie apps & startups

👨‍💻 Author

Built with ❤️ by Charan If you use this in production, ⭐ star the repo!

Libraries

feature_flag_sdk