AppSprint for Flutter

Mobile attribution and event tracking for Flutter apps, backed by the native iOS and Android AppSprint SDKs. The Dart layer is a thin pass-through to the same engines as our standalone iOS and Android SDKs, so behavior matches across platforms.

Requirements

• Flutter 3.22 or later
• Dart 3.3 or later
• iOS 14.0 or later
• Android 7.0 (API 24) or later

Install

Add the package to pubspec.yaml:

dependencies:
  appsprint_flutter: ^1.1.3

Fetch dependencies:

flutter pub get

The Flutter plugin manages the iOS pod and the Android AAR for you. No extra repository setup needed.

Configure

Call configure once in main(), before runApp. It returns a future that resolves after local state is restored; install registration runs in the background:

import 'package:flutter/material.dart';
import 'package:appsprint_flutter/appsprint_flutter.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();

  await AppSprint.instance.configure(
    const AppSprintConfig(apiKey: 'YOUR_API_KEY'),
  );

  runApp(const MyApp());
}

If you prefer the named-argument form for parity with web SDKs:

await AppSprint.instance.configure(
  'YOUR_API_KEY',
  endpointBaseUrl: 'https://api.appsprint.app',
);

Configuration options

Option	Type	Default	What it does
apiKey	String	required	Your AppSprint app key.
apiUrl	String	https://api.appsprint.app	Override for staging or self-hosted environments.
endpointBaseUrl	String	alias for apiUrl	Accepted for compatibility.
enableAppleAdsAttribution	bool	true	iOS only. Fetches Apple AdServices at install time.
customerUserId	String?	null	Your internal user ID. Persists across launches and replays if the first send fails.
autoTrackSessions	bool	true	Fires session_start on configure() and on foreground, debounced to one event per 30 minutes.
autoRefreshAttribution	bool	true	Refreshes attribution from the backend on configure() and on foreground.
isDebug	bool	false	Forces debug-level logging on the native side.
logLevel	int	2	0 = debug, 1 = info, 2 = warn, 3 = error.

Track events

import 'package:appsprint_flutter/appsprint_flutter.dart';

await AppSprint.instance.sendEvent(AppSprintEventType.login);
await AppSprint.instance.sendEvent(AppSprintEventType.signUp);

await AppSprint.instance.sendEvent(
  AppSprintEventType.purchase,
  params: {
    'revenue': 9.99,
    'currency': 'USD',
  },
);

await AppSprint.instance.sendEvent(
  AppSprintEventType.custom,
  name: 'onboarding_step',
  params: {
    'screen': 'welcome',
    'step': 1,
  },
);

sendEvent resolves once the native side has queued the event locally. The actual HTTP send happens on the next flush trigger.

Built-in event types

session_start, login, sign_up, register, purchase, subscribe, start_trial, add_payment_info, add_to_cart, add_to_wishlist, initiate_checkout, view_content, view_item, search, share, tutorial_complete, achieve_level, level_start, level_complete, custom.

Revenue events

Pass revenue (or price as an alias) plus currency. Currency must be a 3-letter ISO code; anything else is dropped on the native side before the request goes out.

await AppSprint.instance.sendEvent(
  AppSprintEventType.subscribe,
  params: {
    'revenue': 4.99,
    'currency': 'EUR',
    'plan': 'monthly',
  },
);

Custom events

await AppSprint.instance.sendEvent(
  AppSprintEventType.custom,
  name: 'level_skip',
  params: {'level': 12},
);

Use name to label custom events. Keep the name stable so your dashboard groups them correctly.

Read attribution

Once an install registers, attribution is cached on the native side. You can read it any time:

final attribution = await AppSprint.instance.getAttribution();
final appsprintId = await AppSprint.instance.getAppSprintId();
final params = await AppSprint.instance.getAttributionParams();

AttributionResult.source is one of apple_ads, tracking_link, or organic.

Forward to RevenueCat or Superwall

getAttributionParams() returns a flat Map<String, String> shaped for partner SDKs:

final params = await AppSprint.instance.getAttributionParams();
await Purchases.setAttributes(params);

Manual refresh

If you need the latest server-side resolution, call refreshAttribution():

final updated = await AppSprint.instance.refreshAttribution();
debugPrint('source = ${updated?.source}');

App Tracking Transparency (iOS only)

final authorized = await AppSprintNative.requestTrackingAuthorization();

The helper waits for the app to reach foreground-active before showing the system prompt, so calling it from main() or initState() is safe.

Add NSUserTrackingUsageDescription to ios/Runner/Info.plist:

<key>NSUserTrackingUsageDescription</key>
<string>This identifier helps us deliver personalized ads.</string>

If you use SKAdNetwork postbacks, also add NSAdvertisingAttributionReportEndpoint.

AppSprintNative.requestTrackingAuthorization() resolves true on Android without prompting; ATT is iOS-only.

Google Advertising ID (Android only)

The native Android SDK reads GAID during install registration, off the main thread, honoring Limit Ad Tracking and dropping the all-zero ID. The plugin declares INTERNET, ACCESS_NETWORK_STATE, and com.google.android.gms.permission.AD_ID. If your app cannot collect advertising IDs (children's apps, regional policies), remove the permission in android/app/src/main/AndroidManifest.xml:

<manifest xmlns:tools="http://schemas.android.com/tools" ...>
    <uses-permission
        android:name="com.google.android.gms.permission.AD_ID"
        tools:node="remove" />
</manifest>

What happens behind the scenes

• configure() resolves after local-state restore. Install registration runs in the background and retries with backoff on transient failures.
• Events queue locally on native storage and survive app restarts.
• iOS uses connectivity-aware networking, so transient offline windows queue inside the OS rather than failing fast.
• A rejected API key (401 or 403) disables the SDK. Future events drop until clearData() is called.
• Late identity updates (setCustomerUserId, iOS Apple Ads opt-in) retry automatically on the next configure() or foreground. If the cached install is no longer recognized, the SDK self-heals by re-registering.

Privacy

The vendored iOS framework ships a PrivacyInfo.xcprivacy manifest declaring UserDefaults access plus DeviceID, ProductInteraction, UserID, CoarseLocation, and OtherDataTypes collection, all marked Tracking: true, with api.appsprint.app listed as a tracking domain.

For Android, include advertising ID collection, device IDs, approximate location/network-derived country, device or other identifiers, app activity, and (if you set customerUserId) user ID in your Play Console Data safety answers.

Don't pass raw PII through params or customerUserId. Both persist to native storage for retry durability. Use hashed or opaque identifiers instead (SHA-256 of an email, RevenueCat or Superwall app_user_id, your internal user UUID).

Local development

await AppSprint.instance.configure(
  const AppSprintConfig(
    apiKey: 'YOUR_DEV_KEY',
    apiUrl: 'http://localhost:3000',
    isDebug: true,
  ),
);

On Android emulator, use http://10.0.2.2:3000 to reach the host machine's localhost.

isDebug: true raises native log level to debug. iOS logs flow into Console.app; Android logs flow into logcat under the AppSprint tag.

Public API reference

AppSprint

import 'package:appsprint_flutter/appsprint_flutter.dart';

• AppSprint.instance.configure(config) initializes the SDK.
• sendEvent(eventType, {name, params}) enqueues an event.
• flush() drains the queue immediately.
• refreshAttribution() fetches the latest attribution from the backend.
• setCustomerUserId(userId) updates the customer user ID.
• getAttribution() returns the cached attribution.
• getAttributionParams() returns the partner-ready payload.
• getAppSprintId() returns the SDK install identifier.
• enableAppleAdsAttribution() re-enables Apple Ads at runtime on iOS; returns false on Android.
• sendTestEvent() posts a diagnostic event and resolves to { success, message }.
• isInitialized() reports whether configure() resolved.
• isSdkDisabled() reports whether a rejected API key disabled the SDK.
• clearData() wipes local state.
• destroy() removes native lifecycle observers.

AppSprintNative

import 'package:appsprint_flutter/appsprint_flutter.dart';

• getDeviceInfo() returns the attribution device signal payload.
• getAdServicesToken() returns Apple's AdServices token on iOS; null on Android.
• requestTrackingAuthorization() shows the ATT prompt on iOS; resolves true on Android.

Support

Issues and feature requests on the GitHub repo. Direct support at support@appsprint.app.

License

MIT