diff --git a/expense_planner/android/app/build.gradle b/expense_planner/android/app/build.gradle
index 23ebfaf..2a9fb3c 100644
--- a/expense_planner/android/app/build.gradle
+++ b/expense_planner/android/app/build.gradle
@@ -38,7 +38,7 @@ android {
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId "com.example.expense_planner"
+        applicationId "github.nisrulz.expense_planner"
         minSdkVersion 16
         targetSdkVersion 28
         versionCode flutterVersionCode.toInteger()
diff --git a/expense_planner/android/app/src/debug/AndroidManifest.xml b/expense_planner/android/app/src/debug/AndroidManifest.xml
index f449810..b1ff93b 100644
--- a/expense_planner/android/app/src/debug/AndroidManifest.xml
+++ b/expense_planner/android/app/src/debug/AndroidManifest.xml
@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.expense_planner">
+    package="github.nisrulz.expense_planner">
     <!-- Flutter needs it to communicate with the running application
          to allow setting breakpoints, to provide hot reload, etc.
     -->
diff --git a/expense_planner/android/app/src/main/AndroidManifest.xml b/expense_planner/android/app/src/main/AndroidManifest.xml
index 41ca788..a16025d 100644
--- a/expense_planner/android/app/src/main/AndroidManifest.xml
+++ b/expense_planner/android/app/src/main/AndroidManifest.xml
@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.expense_planner">
+    package="github.nisrulz.expense_planner">
 
     <!-- io.flutter.app.FlutterApplication is an android.app.Application that
          calls FlutterMain.startInitialization(this); in its onCreate method.
diff --git a/expense_planner/android/app/src/main/kotlin/com/example/expense_planner/MainActivity.kt b/expense_planner/android/app/src/main/kotlin/github/nisrulz/expense_planner/MainActivity.kt
similarity index 88%
rename from expense_planner/android/app/src/main/kotlin/com/example/expense_planner/MainActivity.kt
rename to expense_planner/android/app/src/main/kotlin/github/nisrulz/expense_planner/MainActivity.kt
index 100896b..0bdda4f 100644
--- a/expense_planner/android/app/src/main/kotlin/com/example/expense_planner/MainActivity.kt
+++ b/expense_planner/android/app/src/main/kotlin/github/nisrulz/expense_planner/MainActivity.kt
@@ -1,4 +1,4 @@
-package com.example.expense_planner
+package github.nisrulz.expense_planner
 
 import android.os.Bundle
 
diff --git a/expense_planner/android/app/src/profile/AndroidManifest.xml b/expense_planner/android/app/src/profile/AndroidManifest.xml
index f449810..b1ff93b 100644
--- a/expense_planner/android/app/src/profile/AndroidManifest.xml
+++ b/expense_planner/android/app/src/profile/AndroidManifest.xml
@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.expense_planner">
+    package="github.nisrulz.expense_planner">
     <!-- Flutter needs it to communicate with the running application
          to allow setting breakpoints, to provide hot reload, etc.
     -->
diff --git a/expense_planner/ios/Runner.xcodeproj/project.pbxproj b/expense_planner/ios/Runner.xcodeproj/project.pbxproj
index 7972fe8..c485e98 100644
--- a/expense_planner/ios/Runner.xcodeproj/project.pbxproj
+++ b/expense_planner/ios/Runner.xcodeproj/project.pbxproj
@@ -321,7 +321,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.expensePlanner;
+				PRODUCT_BUNDLE_IDENTIFIER = github.nisrulz.expensePlanner;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_VERSION = 4.0;
@@ -454,7 +454,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.expensePlanner;
+				PRODUCT_BUNDLE_IDENTIFIER = github.nisrulz.expensePlanner;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
@@ -481,7 +481,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.expensePlanner;
+				PRODUCT_BUNDLE_IDENTIFIER = github.nisrulz.expensePlanner;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_VERSION = 4.0;
diff --git a/using_firebase_db/android/app/build.gradle b/using_firebase_db/android/app/build.gradle
index 9b9a5a6..d6a35d6 100644
--- a/using_firebase_db/android/app/build.gradle
+++ b/using_firebase_db/android/app/build.gradle
@@ -33,7 +33,7 @@ android {
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId "com.example.using_firebase_db"
+        applicationId "github.nisrulz.using_firebase_db"
         minSdkVersion 16
         targetSdkVersion 28
         versionCode flutterVersionCode.toInteger()
diff --git a/using_firebase_db/android/app/src/debug/AndroidManifest.xml b/using_firebase_db/android/app/src/debug/AndroidManifest.xml
index 3409f8a..20cf5bc 100644
--- a/using_firebase_db/android/app/src/debug/AndroidManifest.xml
+++ b/using_firebase_db/android/app/src/debug/AndroidManifest.xml
@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.using_firebase_db">
+    package="github.nisrulz.using_firebase_db">
     <!-- Flutter needs it to communicate with the running application
          to allow setting breakpoints, to provide hot reload, etc.
     -->
diff --git a/using_firebase_db/android/app/src/main/AndroidManifest.xml b/using_firebase_db/android/app/src/main/AndroidManifest.xml
index ac55536..d85bfcb 100644
--- a/using_firebase_db/android/app/src/main/AndroidManifest.xml
+++ b/using_firebase_db/android/app/src/main/AndroidManifest.xml
@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.using_firebase_db">
+    package="github.nisrulz.using_firebase_db">
 
     <!-- io.flutter.app.FlutterApplication is an android.app.Application that
          calls FlutterMain.startInitialization(this); in its onCreate method.
diff --git a/using_firebase_db/android/app/src/main/java/com/example/using_firebase_db/MainActivity.java b/using_firebase_db/android/app/src/main/java/github/nisrulz/using_firebase_db/MainActivity.java
similarity index 88%
rename from using_firebase_db/android/app/src/main/java/com/example/using_firebase_db/MainActivity.java
rename to using_firebase_db/android/app/src/main/java/github/nisrulz/using_firebase_db/MainActivity.java
index 0c3f5ca..7bd98bc 100644
--- a/using_firebase_db/android/app/src/main/java/com/example/using_firebase_db/MainActivity.java
+++ b/using_firebase_db/android/app/src/main/java/github/nisrulz/using_firebase_db/MainActivity.java
@@ -1,4 +1,4 @@
-package com.example.using_firebase_db;
+package github.nisrulz.using_firebase_db;
 
 import android.os.Bundle;
 import io.flutter.app.FlutterActivity;
diff --git a/using_firebase_db/android/app/src/profile/AndroidManifest.xml b/using_firebase_db/android/app/src/profile/AndroidManifest.xml
index 3409f8a..20cf5bc 100644
--- a/using_firebase_db/android/app/src/profile/AndroidManifest.xml
+++ b/using_firebase_db/android/app/src/profile/AndroidManifest.xml
@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.using_firebase_db">
+    package="github.nisrulz.using_firebase_db">
     <!-- Flutter needs it to communicate with the running application
          to allow setting breakpoints, to provide hot reload, etc.
     -->
diff --git a/using_firebase_db/ios/Runner.xcodeproj/project.pbxproj b/using_firebase_db/ios/Runner.xcodeproj/project.pbxproj
index 7ec807a..bce7d5e 100644
--- a/using_firebase_db/ios/Runner.xcodeproj/project.pbxproj
+++ b/using_firebase_db/ios/Runner.xcodeproj/project.pbxproj
@@ -323,7 +323,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.usingFirebaseDb;
+				PRODUCT_BUNDLE_IDENTIFIER = github.nisrulz.usingFirebaseDb;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				VERSIONING_SYSTEM = "apple-generic";
 			};
@@ -448,7 +448,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.usingFirebaseDb;
+				PRODUCT_BUNDLE_IDENTIFIER = github.nisrulz.usingFirebaseDb;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				VERSIONING_SYSTEM = "apple-generic";
 			};
@@ -471,7 +471,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.usingFirebaseDb;
+				PRODUCT_BUNDLE_IDENTIFIER = github.nisrulz.usingFirebaseDb;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				VERSIONING_SYSTEM = "apple-generic";
 			};