diff --git a/WooCommerce/Classes/Analytics/WooAnalyticsEvent+ApplicationPassword.swift b/WooCommerce/Classes/Analytics/WooAnalyticsEvent+ApplicationPassword.swift
index c9f65f6d345..3897a2ed1ad 100644
--- a/WooCommerce/Classes/Analytics/WooAnalyticsEvent+ApplicationPassword.swift
+++ b/WooCommerce/Classes/Analytics/WooAnalyticsEvent+ApplicationPassword.swift
@@ -5,6 +5,7 @@ extension WooAnalyticsEvent {
         private enum Key {
             static let scenario = "scenario"
             static let cause = "cause"
+            static let experimentVariant = "experiment_variant"
         }
 
         enum Scenario: String {
@@ -19,6 +20,13 @@ extension WooAnalyticsEvent {
             case other = "other"
         }
 
+        /// Tracks the REST API A/B test variation
+        ///
+        static func restAPILoginExperiment(variation: String) -> WooAnalyticsEvent {
+            WooAnalyticsEvent(statName: .trackRestAPILoginExperimentVariation,
+                              properties: [Key.experimentVariant: variation])
+        }
+
         /// Tracks when generating application password succeeds
         ///
         static func applicationPasswordGeneratedSuccessfully(scenario: Scenario) -> WooAnalyticsEvent {
diff --git a/WooCommerce/Classes/Analytics/WooAnalyticsStat.swift b/WooCommerce/Classes/Analytics/WooAnalyticsStat.swift
index e44291e8a16..40893800e1f 100644
--- a/WooCommerce/Classes/Analytics/WooAnalyticsStat.swift
+++ b/WooCommerce/Classes/Analytics/WooAnalyticsStat.swift
@@ -821,6 +821,7 @@ public enum WooAnalyticsStat: String {
     // MARK: Application password Events
     case applicationPasswordsNewPasswordCreated = "application_passwords_new_password_created"
     case applicationPasswordsGenerationFailed = "application_passwords_generation_failed"
+    case trackRestAPILoginExperimentVariation = "rest_api_login_experiment"
 }
 
 public extension WooAnalyticsStat {
diff --git a/WooCommerce/Classes/ViewRelated/AppCoordinator.swift b/WooCommerce/Classes/ViewRelated/AppCoordinator.swift
index 0a2c5d271f9..fe6cf72f201 100644
--- a/WooCommerce/Classes/ViewRelated/AppCoordinator.swift
+++ b/WooCommerce/Classes/ViewRelated/AppCoordinator.swift
@@ -142,6 +142,8 @@ private extension AppCoordinator {
         } else {
             configureAndDisplayAuthenticator()
         }
+
+        analytics.track(event: .ApplicationPassword.restAPILoginExperiment(variation: ABTest.applicationPasswordAuthentication.variation.analyticsValue))
     }
 
     /// Configures the WPAuthenticator and sets the authenticator UI as the window's root view.
diff --git a/WooCommerce/WooCommerceTests/AppCoordinatorTests.swift b/WooCommerce/WooCommerceTests/AppCoordinatorTests.swift
index b483d788719..b60d300540c 100644
--- a/WooCommerce/WooCommerceTests/AppCoordinatorTests.swift
+++ b/WooCommerce/WooCommerceTests/AppCoordinatorTests.swift
@@ -318,7 +318,25 @@ final class AppCoordinatorTests: XCTestCase {
         appCoordinator.start()
 
         // Then
-        XCTAssertEqual(analytics.receivedEvents, [WooAnalyticsStat.loginOnboardingShown.rawValue])
+        _ = try XCTUnwrap(analytics.receivedEvents.firstIndex(where: { $0 == WooAnalyticsStat.loginOnboardingShown.rawValue}))
+    }
+
+    func test_trackRestAPILoginExperimentVariation_is_tracked_after_presenting_onboarding() throws {
+        // Given
+        stores.deauthenticate()
+        let analytics = MockAnalyticsProvider()
+        let appCoordinator = makeCoordinator(window: window,
+                                             stores: stores,
+                                             authenticationManager: authenticationManager,
+                                             analytics: WooAnalytics(analyticsProvider: analytics))
+
+        // When
+        appCoordinator.start()
+
+        // Then
+        let indexOfEvent = try XCTUnwrap(analytics.receivedEvents.firstIndex(where: { $0 == "rest_api_login_experiment" }))
+        let eventProperties = try XCTUnwrap(analytics.receivedProperties[indexOfEvent])
+        XCTAssertNotNil(eventProperties["experiment_variant"] as? String)
     }
 
     // MARK: - Login reminder analytics
@@ -340,10 +358,12 @@ final class AppCoordinatorTests: XCTestCase {
         pushNotesManager.sendLocalNotificationResponse(response)
 
         // Then
-        XCTAssertEqual(analytics.receivedEvents, [WooAnalyticsStat.loginLocalNotificationTapped.rawValue])
-        let actionPropertyValue = try XCTUnwrap(analytics.receivedProperties.first?["action"] as? String)
+        let indexOfEvent = try XCTUnwrap(analytics.receivedEvents.firstIndex(where: { $0 == WooAnalyticsStat.loginLocalNotificationTapped.rawValue}))
+        let eventProperties = try XCTUnwrap(analytics.receivedProperties[indexOfEvent])
+
+        let actionPropertyValue = try XCTUnwrap(eventProperties["action"] as? String)
         XCTAssertEqual(actionPropertyValue, "contact_support")
-        let typePropertyValue = try XCTUnwrap(analytics.receivedProperties.first?["type"] as? String)
+        let typePropertyValue = try XCTUnwrap(eventProperties["type"] as? String)
         XCTAssertEqual(typePropertyValue, "site_address_error")
     }
 
@@ -364,10 +384,12 @@ final class AppCoordinatorTests: XCTestCase {
         pushNotesManager.sendLocalNotificationResponse(response)
 
         // Then
-        XCTAssertEqual(analytics.receivedEvents, [WooAnalyticsStat.loginLocalNotificationTapped.rawValue])
-        let actionPropertyValue = try XCTUnwrap(analytics.receivedProperties.first?["action"] as? String)
+        let indexOfEvent = try XCTUnwrap(analytics.receivedEvents.firstIndex(where: { $0 == WooAnalyticsStat.loginLocalNotificationTapped.rawValue}))
+        let eventProperties = try XCTUnwrap(analytics.receivedProperties[indexOfEvent])
+
+        let actionPropertyValue = try XCTUnwrap(eventProperties["action"] as? String)
         XCTAssertEqual(actionPropertyValue, "login_with_wpcom")
-        let typePropertyValue = try XCTUnwrap(analytics.receivedProperties.first?["type"] as? String)
+        let typePropertyValue = try XCTUnwrap(eventProperties["type"] as? String)
         XCTAssertEqual(typePropertyValue, "site_address_error")
     }
 
@@ -388,10 +410,12 @@ final class AppCoordinatorTests: XCTestCase {
         pushNotesManager.sendLocalNotificationResponse(response)
 
         // Then
-        XCTAssertEqual(analytics.receivedEvents, [WooAnalyticsStat.loginLocalNotificationTapped.rawValue])
-        let actionPropertyValue = try XCTUnwrap(analytics.receivedProperties.first?["action"] as? String)
+        let indexOfEvent = try XCTUnwrap(analytics.receivedEvents.firstIndex(where: { $0 == WooAnalyticsStat.loginLocalNotificationTapped.rawValue}))
+        let eventProperties = try XCTUnwrap(analytics.receivedProperties[indexOfEvent])
+
+        let actionPropertyValue = try XCTUnwrap(eventProperties["action"] as? String)
         XCTAssertEqual(actionPropertyValue, "default")
-        let typePropertyValue = try XCTUnwrap(analytics.receivedProperties.first?["type"] as? String)
+        let typePropertyValue = try XCTUnwrap(eventProperties["type"] as? String)
         XCTAssertEqual(typePropertyValue, "site_address_error")
     }
 
@@ -412,8 +436,10 @@ final class AppCoordinatorTests: XCTestCase {
         pushNotesManager.sendLocalNotificationResponse(response)
 
         // Then
-        XCTAssertEqual(analytics.receivedEvents, [WooAnalyticsStat.loginLocalNotificationDismissed.rawValue])
-        let typePropertyValue = try XCTUnwrap(analytics.receivedProperties.first?["type"] as? String)
+        let indexOfEvent = try XCTUnwrap(analytics.receivedEvents.firstIndex(where: { $0 == WooAnalyticsStat.loginLocalNotificationDismissed.rawValue}))
+        let eventProperties = try XCTUnwrap(analytics.receivedProperties[indexOfEvent])
+
+        let typePropertyValue = try XCTUnwrap(eventProperties["type"] as? String)
         XCTAssertEqual(typePropertyValue, "site_address_error")
     }
 }