iOS deferred deep linking with iOS Private Relay

With the launch of 1OS 15, Apple provides iCloud+ users with a feature called Private Relay, which gives them the option to encrypt their web-browsing traffic and hide their exact location, IP address, and the contents of their browsing traffic. If users opt-in to Private Relay, this could interfere with attribution and deferred deep linking. Meaning, once a new user without the app goes to the App Store, and installs and launches the app, Private Relay could prevent them from being sent to a specific page in the app.

To ensure that deferred deep linking (DDL) continues to work as expected, you need to implement one of the following AppsFlyer solutions:

  • [Recommended] App Clip-based solution: Create an App Clip that gives you user attribution data, and directs users to a customized App Clip experience similar to the one you want DDL to achieve. The app clip can also include a flow to direct users from your App Clip to your full app.
  • Clipboard-based solution: Create a web landing page that copies the deferred deep linking data from the URL and correctly redirects the user to the app. Note: This solution does not help with attribution.

App Clip-based solution

Prerequisites: AppsFlyer SDK V6.4.0+

To set up the App Clip-based DDL solution:

  1. Follow the Apple instructions and develop an App Clip that provides the desired user journey.
  2. Integrate the AppsFlyer SDK for App Clips, including App Clip-to-full app attribution.
  3. In the App Clip sceneDelegate:
    • Replace scene continue userActivity with the following function:
func scene(_ scene: UIScene, continue userActivity: NSUserActivity) {
  // Must for AppsFlyer attrib
  AppsFlyerLib.shared().continue(userActivity, restorationHandler: nil)

  //Get the invocation URL from the userActivity in order to add it to the shared user default
  guard userActivity.activityType == NSUserActivityTypeBrowsingWeb,
  let invocationURL = userActivity.webpageURL else {

⇲ Github links: Swift

  • Add the following method:
func addDlUrlToSharedUserDefaults(_ url: URL){
  guard let sharedUserDefaults = UserDefaults(suiteName: "group.<your_app>.appClipToFullApp") else {
  //Add invocation URL to the app group
  sharedUserDefaults.set(url, forKey: "dl_url")
  //Enable sending events
  sharedUserDefaults.set(true, forKey: "AppsFlyerReadyToSendEvents")

⇲ Github links: Swift

  1. In the full app:
    • In appDelegate, add the following method:
func deepLinkFromAppClip() {
  guard let sharedUserDefaults = UserDefaults(suiteName: "group.<your_app>.appClipToFullApp"),
  let dlUrl = sharedUserDefaults.url(forKey: "dl_url")
  else {
    NSLog("Could not find the App Group or the deep link URL from the app clip")
  AppsFlyerLib.shared().performOnAppAttribution(with: dlUrl)
  sharedUserDefaults.removeObject(forKey: "dl_url")

⇲ Github links: Swift

  • At the end of the application didFinishLaunchingWithOptions launchOptions method, call deepLinkFromAppClip:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

  // ...


  return true

⇲ Github links: Swift

Clipboard-based solution

To set up the clipboard-based solution:

  1. Enter the following code in appDelegate.
NSString *pasteboardUrl = [[UIPasteboard generalPasteboard] string];
NSString *checkParameter = @"cp_url=true";

if ([pasteboardUrl containsString:checkParameter]) {
  [[AppsFlyerLib shared] performOnAppAttributionWithURL:[NSURL URLWithString:pasteboardUrl]];
var pasteboardUrl = UIPasteboard.general.string ?? ""
let checkParameter = "cp_url=true"

if pasteboardUrl.contains(checkParameter) {
    AppsFlyerLib.shared().performOnAppAttribution(with: URL(string: pasteboardUrl))
  1. Implement code that pastes the deferred deep link data in the URL from the clipboard. This is not part of the AppsFlyer SDK.