diff --git a/DevLog/Domain/Entity/PushNotification.swift b/DevLog/Domain/Entity/PushNotification.swift
index 06b29eeb..6d2a00bc 100644
--- a/DevLog/Domain/Entity/PushNotification.swift
+++ b/DevLog/Domain/Entity/PushNotification.swift
@@ -7,7 +7,7 @@
 
 import Foundation
 
-struct PushNotification {
+struct PushNotification: Hashable {
     let id: String
     let title: String
     let body: String
diff --git a/DevLog/Domain/Entity/SystemTodoCategory.swift b/DevLog/Domain/Entity/SystemTodoCategory.swift
index e49fdd52..32020626 100644
--- a/DevLog/Domain/Entity/SystemTodoCategory.swift
+++ b/DevLog/Domain/Entity/SystemTodoCategory.swift
@@ -7,7 +7,7 @@
 
 import Foundation
 
-enum SystemTodoCategory: String, CaseIterable {
+enum SystemTodoCategory: String, CaseIterable, Hashable {
     case issue          // 이슈
     case feature        // 신규 기능
     case improvement    // 개선/리팩터링
diff --git a/DevLog/Domain/Entity/Todo.swift b/DevLog/Domain/Entity/Todo.swift
index e34da02c..da3c69e9 100644
--- a/DevLog/Domain/Entity/Todo.swift
+++ b/DevLog/Domain/Entity/Todo.swift
@@ -7,7 +7,7 @@
 
 import Foundation
 
-struct Todo: Equatable {
+struct Todo: Hashable {
     let id: String
     var isPinned: Bool      //  해당 할 일이 상단에 고정되어 있는지 여부
     var isCompleted: Bool   //  해당 할 일의 완료 여부
diff --git a/DevLog/Domain/Entity/TodoCategory.swift b/DevLog/Domain/Entity/TodoCategory.swift
index a914869a..85e177db 100644
--- a/DevLog/Domain/Entity/TodoCategory.swift
+++ b/DevLog/Domain/Entity/TodoCategory.swift
@@ -7,7 +7,7 @@
 
 import Foundation
 
-enum TodoCategory: Equatable {
+enum TodoCategory: Hashable {
     case system(SystemTodoCategory)
     case user(UserTodoCategory)
 
diff --git a/DevLog/Domain/Entity/TodoReference.swift b/DevLog/Domain/Entity/TodoReference.swift
index 3b8a7470..5a7ccf23 100644
--- a/DevLog/Domain/Entity/TodoReference.swift
+++ b/DevLog/Domain/Entity/TodoReference.swift
@@ -7,7 +7,7 @@
 
 import Foundation
 
-struct TodoReference {
+struct TodoReference: Hashable {
     let id: String
     let title: String
     let category: TodoCategory
diff --git a/DevLog/Domain/Entity/UserTodoCategory.swift b/DevLog/Domain/Entity/UserTodoCategory.swift
index f35ff6e0..9b05b766 100644
--- a/DevLog/Domain/Entity/UserTodoCategory.swift
+++ b/DevLog/Domain/Entity/UserTodoCategory.swift
@@ -7,7 +7,7 @@
 
 import Foundation
 
-struct UserTodoCategory: Equatable {
+struct UserTodoCategory: Hashable {
     var id: String
     var name: String
     var colorHex: String
diff --git a/DevLog/Domain/Entity/WebPage.swift b/DevLog/Domain/Entity/WebPage.swift
index fb1b5305..5a16ad80 100644
--- a/DevLog/Domain/Entity/WebPage.swift
+++ b/DevLog/Domain/Entity/WebPage.swift
@@ -7,7 +7,7 @@
 
 import Foundation
 
-struct WebPage {
+struct WebPage: Hashable {
     let title: String?
     let url: URL
     let displayURL: URL
diff --git a/DevLog/Presentation/Structure/Profile/ProfileSelectedDayActivity.swift b/DevLog/Presentation/Structure/Profile/ProfileSelectedDayActivity.swift
index 9ad52abf..fb56c40e 100644
--- a/DevLog/Presentation/Structure/Profile/ProfileSelectedDayActivity.swift
+++ b/DevLog/Presentation/Structure/Profile/ProfileSelectedDayActivity.swift
@@ -20,16 +20,4 @@ struct ProfileSelectedDayActivity: Identifiable, Hashable {
         }
         return showsCreated ? "생성" : "완료"
     }
-
-    static func == (lhs: Self, rhs: Self) -> Bool {
-        lhs.todo.id == rhs.todo.id
-            && lhs.showsCreated == rhs.showsCreated
-            && lhs.showsCompleted == rhs.showsCompleted
-    }
-
-    func hash(into hasher: inout Hasher) {
-        hasher.combine(todo.id)
-        hasher.combine(showsCreated)
-        hasher.combine(showsCompleted)
-    }
 }
diff --git a/DevLog/Presentation/Structure/PushNotificationItem.swift b/DevLog/Presentation/Structure/PushNotificationItem.swift
index cce0d540..dd8273fb 100644
--- a/DevLog/Presentation/Structure/PushNotificationItem.swift
+++ b/DevLog/Presentation/Structure/PushNotificationItem.swift
@@ -25,12 +25,4 @@ struct PushNotificationItem: Identifiable, Hashable {
         self.todoId = notification.todoId
         self.todoCategory = notification.todoCategory
     }
-
-    static func == (lhs: PushNotificationItem, rhs: PushNotificationItem) -> Bool {
-        lhs.id == rhs.id
-    }
-
-    func hash(into hasher: inout Hasher) {
-        hasher.combine(id)
-    }
 }
diff --git a/DevLog/Presentation/Structure/RecentTodoItem.swift b/DevLog/Presentation/Structure/RecentTodoItem.swift
index 0d972555..57ac2cdc 100644
--- a/DevLog/Presentation/Structure/RecentTodoItem.swift
+++ b/DevLog/Presentation/Structure/RecentTodoItem.swift
@@ -25,12 +25,4 @@ struct RecentTodoItem: Identifiable, Hashable {
         self.tags = todo.tags
         self.category = todo.category
     }
-
-    static func == (lhs: RecentTodoItem, rhs: RecentTodoItem) -> Bool {
-        lhs.id == rhs.id
-    }
-
-    func hash(into hasher: inout Hasher) {
-        hasher.combine(id)
-    }
 }
diff --git a/DevLog/Presentation/Structure/TodayTodoItem.swift b/DevLog/Presentation/Structure/TodayTodoItem.swift
index 7e583bbc..7afd16cc 100644
--- a/DevLog/Presentation/Structure/TodayTodoItem.swift
+++ b/DevLog/Presentation/Structure/TodayTodoItem.swift
@@ -27,12 +27,4 @@ struct TodayTodoItem: Identifiable, Hashable {
         self.dueDate = todo.dueDate
         self.category = todo.category
     }
-
-    static func == (lhs: TodayTodoItem, rhs: TodayTodoItem) -> Bool {
-        lhs.id == rhs.id
-    }
-
-    func hash(into hasher: inout Hasher) {
-        hasher.combine(id)
-    }
 }
diff --git a/DevLog/Presentation/Structure/UserTodoCategoryItem.swift b/DevLog/Presentation/Structure/UserTodoCategoryItem.swift
index cabd7b82..cd3ad23b 100644
--- a/DevLog/Presentation/Structure/UserTodoCategoryItem.swift
+++ b/DevLog/Presentation/Structure/UserTodoCategoryItem.swift
@@ -21,12 +21,4 @@ struct UserTodoCategoryItem: Identifiable, Hashable {
     var localizedName: String { userTodoCategory.name }
 
     var color: Color { Color(hexString: userTodoCategory.colorHex) ?? .gray }
-
-    static func == (lhs: UserTodoCategoryItem, rhs: UserTodoCategoryItem) -> Bool {
-        lhs.id == rhs.id
-    }
-
-    func hash(into hasher: inout Hasher) {
-        hasher.combine(id)
-    }
 }
diff --git a/DevLog/Presentation/Structure/WebPageItem.swift b/DevLog/Presentation/Structure/WebPageItem.swift
index 2133a7bb..bc143168 100644
--- a/DevLog/Presentation/Structure/WebPageItem.swift
+++ b/DevLog/Presentation/Structure/WebPageItem.swift
@@ -20,13 +20,3 @@ struct WebPageItem: Identifiable, Hashable {
     var displayURL: String { metadata.displayURL.absoluteString }
     var imageURL: URL? { metadata.imageURL }
 }
-
-extension WebPageItem {
-    func hash(into hasher: inout Hasher) {
-        hasher.combine(metadata.url)
-    }
-
-    static func == (lhs: WebPageItem, rhs: WebPageItem) -> Bool {
-        lhs.metadata.url == rhs.metadata.url
-    }
-}
diff --git a/DevLog/Presentation/ViewModel/TodoManageViewModel.swift b/DevLog/Presentation/ViewModel/TodoManageViewModel.swift
index 4feffe8d..eea980c9 100644
--- a/DevLog/Presentation/ViewModel/TodoManageViewModel.swift
+++ b/DevLog/Presentation/ViewModel/TodoManageViewModel.swift
@@ -53,13 +53,13 @@ final class TodoManageViewModel: Store {
 
     var placeholder: String {
         guard
-            let categoryItem = state.category,
-            case .user(let userTodoCategory) = categoryItem.category
+            let item = state.category,
+            case .user(let category) = item.category
         else {
             return "이름"
         }
 
-        return userTodoCategory.name
+        return category.name
     }
 
     var categoryNameCountText: String {
@@ -81,28 +81,36 @@ final class TodoManageViewModel: Store {
             return false
         }
 
-        let trimmedCategoryName = category.name.trimmingCharacters(in: .whitespacesAndNewlines)
-        if trimmedCategoryName.isEmpty {
+        let name = category.name.trimmingCharacters(in: .whitespacesAndNewlines)
+        if name.isEmpty {
             return false
         }
 
         if SystemTodoCategory.allCases.contains(where: {
-            $0.rawValue.caseInsensitiveCompare(trimmedCategoryName) == .orderedSame
+            $0.rawValue.caseInsensitiveCompare(name) == .orderedSame
         }) {
             return false
         }
 
         if state.preferences.contains(where: { item in
-            guard case .user(let userTodoCategory) = item.category,
-                  userTodoCategory.id != category.id else {
+            guard case .user(let userCategory) = item.category,
+                  userCategory.id != category.id else {
                 return false
             }
 
-            return userTodoCategory.name.caseInsensitiveCompare(trimmedCategoryName) == .orderedSame
+            return userCategory.name.caseInsensitiveCompare(name) == .orderedSame
         }) {
             return false
         }
 
+        if let item = state.preferences.first(where: { $0.id == item.id }),
+           case .user(let originalCategory) = item.category {
+            let originalName = originalCategory.name.trimmingCharacters(in: .whitespacesAndNewlines)
+            if originalName == name && originalCategory.colorHex == category.colorHex {
+                return false
+            }
+        }
+
         return true
     }