🚀 Check App Version

The ultimate, modern, and elegant solution to manage app updates in your Flutter applications (supporting both soft and mandatory updates).

No complex setups, no headaches. With a single line of code, you can evaluate the installed version, compare it with your server, and present gorgeous, ready-to-use Material 3 UI presentations.

---

✨ Why choose check_app_version?

• ⚡ 30-Second Implementation: A single, clean static entry point handles all the heavy lifting.
• 🎨 Premium Built-in UIs: Gorgeous and responsive dialogs, bottom sheets, full-screen pages, and overlay banners that automatically adapt to light/dark themes.
• 📦 Granular JSON Schema: Configure separate update policies for Android and iOS (e.g. enforce a mandatory update on iOS but keep it optional on Android).
• ⚙️ Intelligent Caching: Prevents redundant network requests by caching decisions in memory (10-minute default TTL).
• 🛡️ Battle-Tested & Resilient (Zero Crash): Gracefully handles network failures or malformed JSON payloads without ever crashing your host application.

---

🚀 Quick Start (Get Ready in 3 Steps)

1. Prepare your JSON (can be a static file or a dynamic response from your backend API)

{
  "platforms": {
    "android": {
      "bundle_id": "com.example.myapp",
      "min_required_version": "1.5.0",
      "min_required_build": 36,
      "latest_version": "1.6.0",
      "latest_build": 40,
      "force_update": false
    },
    "ios": {
      "bundle_id": "com.example.myapp",
      "min_required_version": "1.5.0",
      "min_required_build": 36,
      "latest_version": "1.6.0",
      "latest_build": 40,
      "force_update": true,
      "app_store_id": "123456789"
    }
  }
}

2. Fetch the Update Decision

Invoke the check on your application startup:

import 'package:check_app_version/check_app_version.dart';

final decision = await CheckAppVersion.get(
  'https://yoursite.com/version.json',
);

3. Display the UI

If an update is required, render one of the stunning built-in layouts:

if (decision.shouldUpdate) {
  CheckAppVersion.showUpdateDialog(
    context,
    decision: decision,
    onOpenStore: () => launchUrl(storeUri),
  );
}

---

🎨 Choose Your Presentation Layout!

You can pick between 4 different layout styles based on your preferred User Experience:

💬 1. Classic Dialog (showUpdateDialog)

A clean, elegant popup card overlaying your content.

CheckAppVersion.showUpdateDialog(
  context,
  decision: decision,
  onOpenStore: () => openStore(),
);

📋 2. Modal Bottom Sheet (showUpdateModal)

A modern sheet sliding up from the bottom. Perfect for non-blocking soft updates.

CheckAppVersion.showUpdateModal(
  context,
  decision: decision,
  onOpenStore: () => openStore(),
);

🖥️ 3. Full-Screen Blocking Page (showUpdatePage)

An immersive full-screen view. Best for mandatory updates (force_update: true).

CheckAppVersion.showUpdatePage(
  context,
  decision: decision,
  onOpenStore: () => openStore(),
);

🔔 4. Overlay Banner (UpdateOverlay)

A non-intrusive stack banner positioned at the top of your screen.

UpdateOverlay(
  decision: decision,
  onOpenStore: () => openStore(),
  onDismiss: () => hideBanner(),
)

---

🛠️ Custom UI? No Problem!

If you prefer not to use our pre-built widgets, you can easily build your own custom interface. Since the business logic is fully decoupled from the UI, simply run the silent check and use the UpdateDecision properties:

final decision = await CheckAppVersion.get('https://yoursite.com/version.json');

if (decision.shouldUpdate) {
  if (decision.isForceUpdate) {
    showMyCustomBlockingUI(
      requiredMinVersion: decision.requiredMinVersion,
      storeId: decision.appStoreId,
    );
  } else {
    showMyCustomSoftBanner(
      latestVersion: decision.latestVersion,
    );
  }
}

Available Properties on UpdateDecision:

• shouldUpdate (bool): true if an update is available.
• isForceUpdate (bool): true if the update is mandatory.
• reason (UpdateReason): Why the decision was made (e.g. .belowMinimum, .belowLatest, .upToDate, .networkError, .parseError).
• installedVersion & installedBuild (String / int): The currently running app configurations.
• requiredMinVersion & requiredMinBuild (String / int): The minimum configurations required by the server.
• latestVersion & latestBuild (String / int): The latest releases available on the server.
• appStoreId (String): The App Store product ID (useful for launcher links).

---

⚙️ Caching & Custom Policies

Decisions are automatically cached in memory for 10 minutes. Customize this behavior using UpdatePolicy:

final decision = await CheckAppVersion.get(
  url,
  policy: const UpdatePolicy(
    forceRefresh: true, // Bypass cache lookup and fetch fresh data
    cacheTtl: Duration(minutes: 5), // Adjust cache duration to 5 minutes
    httpTimeout: Duration(seconds: 3), // Set network request timeout
  ),
);

---

🔄 Effortless Migration from v2.x to v3.0.0

Version 3.0.0 dramatically simplifies your Dart codebase and enhances the JSON format. Let's migrate in a breeze:

1. JSON Schema Migration

v2.x (Legacy Flat Schema)	v3.0.0 (Modern Platform-Nested Schema)
Shared versioning logic across all platforms.	Totally isolated configurations per platform.
Flat keys (new_app_version, android_package).	Dedicated platform nodes (platforms.android).

// NEW v3.0.0 SCHEMA
{
  "platforms": {
    "android": {
      "bundle_id": "com.my.app",
      "min_required_version": "1.0.0",
      "min_required_build": 10
    }
  }
}

2. Dart API Migration

Before (v2.x - Widget-Instantiation)

final dialog = AppVersionDialog(
  jsonUrl: 'https://example.com/version.json',
  context: context,
  title: 'New Update Available',
  onPressConfirm: () => openStore(),
);
await dialog.show();

Now (v3.0.0 - Clean Static Facade)

// 1. Evaluate versions
final decision = await CheckAppVersion.get('https://example.com/version.json');

// 2. Render UI
if (decision.shouldUpdate) {
  CheckAppVersion.showUpdateDialog(
    context,
    decision: decision,
    onOpenStore: () => openStore(),
  );
}