feature_flag_sdk 0.0.3

Feature flag SDK for Flutter with remote toggle, caching, and offline support.

Feature Flags SDK

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

Works with the Feature Flags Backend + Dashboard built.

Features

• API key based authentication
• Fast flag fetch
• Local cache & offline fallback
• 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: 0.0.3

Quick Start

1. Initialize SDK

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

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

  runApp(MyApp());
}

2. Use flags anywhere

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

Fallback values

FeatureFlagSDK.isEnabled("new_home", fallbackValue: false);

Offline support

If network fails:

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

Security model

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

Example

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

Dispose (optional)

FeatureFlagSDK.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
• free
• perfect for indie apps & startups

Reach out on GitHub https://github.com/charanprasanth if you have ideas feedback or want to contribute If you use this in production, star the repo!