diff --git a/Application/DevLogPresentation/Sources/Root/RootFeature.swift b/Application/DevLogPresentation/Sources/Root/RootFeature.swift
index 861530c1..36669c45 100644
--- a/Application/DevLogPresentation/Sources/Root/RootFeature.swift
+++ b/Application/DevLogPresentation/Sources/Root/RootFeature.swift
@@ -109,7 +109,10 @@ struct RootFeature {
                 if result {
                     state.selectedMainTab = .home
                 } else {
-                    return trackLoginScreenEffect()
+                    return .merge(
+                        trackLoginScreenEffect(),
+                        clearApplicationBadgeCountEffect()
+                    )
                 }
             }
 
diff --git a/Application/DevLogPresentation/Tests/Root/RootFeatureTestSupport.swift b/Application/DevLogPresentation/Tests/Root/RootFeatureTestSupport.swift
index a961b077..f297e540 100644
--- a/Application/DevLogPresentation/Tests/Root/RootFeatureTestSupport.swift
+++ b/Application/DevLogPresentation/Tests/Root/RootFeatureTestSupport.swift
@@ -9,6 +9,7 @@ import Combine
 import ComposableArchitecture
 import DevLogCore
 import DevLogDomain
+import Foundation
 import Testing
 @testable import DevLogPresentation
 
@@ -299,9 +300,18 @@ final class RootTrackAnalyticsEventUseCaseSpy: TrackAnalyticsEventUseCase {
 }
 
 final class RootApplicationBadgeCountSpy: @unchecked Sendable {
-    private(set) var counts = [Int]()
+    private let lock = NSLock()
+    private var protectedCounts = [Int]()
+
+    var counts: [Int] {
+        lock.withLock {
+            protectedCounts
+        }
+    }
 
     func setBadgeCount(_ count: Int) async throws {
-        counts.append(count)
+        lock.withLock {
+            protectedCounts.append(count)
+        }
     }
 }
diff --git a/Application/DevLogPresentation/Tests/Root/RootFeatureTests.swift b/Application/DevLogPresentation/Tests/Root/RootFeatureTests.swift
index bd75da05..db68a4a1 100644
--- a/Application/DevLogPresentation/Tests/Root/RootFeatureTests.swift
+++ b/Application/DevLogPresentation/Tests/Root/RootFeatureTests.swift
@@ -39,6 +39,19 @@ struct RootFeatureTests {
         await verifyDidLoginedFalse(adapter: adapter, trackAnalyticsEventUseCaseSpy: trackSpy)
     }
 
+    @Test("RootFeature didLogined(false)는 앱 badge 초기화를 요청한다")
+    func RootFeature_didLogined_false는_앱_badge_초기화를_요청한다() async {
+        let badgeSpy = RootApplicationBadgeCountSpy()
+        let adapter = RootStoreTestAdapter(badgeCountSpy: badgeSpy)
+
+        await adapter.didLogined(false)
+        await waitUntil {
+            badgeSpy.counts == [0]
+        }
+
+        #expect(badgeSpy.counts == [0])
+    }
+
     @Test("RootFeature didLogined(true)는 기존 Root 상태관리처럼 signIn 상태를 true로 갱신하고 selectedMainTab을 home으로 되돌린다")
     func RootFeature_didLogined_true는_기존_Root_상태관리처럼_signIn_상태를_true로_갱신하고_selectedMainTab을_home으로_되돌린다() async {
         let trackSpy = RootTrackAnalyticsEventUseCaseSpy()