diff --git a/app/src/main/java/org/communiquons/android/comunic/client/Account.java b/app/src/main/java/org/communiquons/android/comunic/client/Account.java
index dd3002f..7cfec7f 100644
--- a/app/src/main/java/org/communiquons/android/comunic/client/Account.java
+++ b/app/src/main/java/org/communiquons/android/comunic/client/Account.java
@@ -66,6 +66,14 @@ class Account {
         return true;
     }
 
+    /**
+     * Sign out user
+     * @return True in case of success / false else
+     */
+    boolean sign_out(){
+        return remove_login_tokens();
+    }
+
     /**
      * Try to load tokens in tokens array
      *
diff --git a/app/src/main/java/org/communiquons/android/comunic/client/MainActivity.java b/app/src/main/java/org/communiquons/android/comunic/client/MainActivity.java
index 92a149f..a0b2e9b 100644
--- a/app/src/main/java/org/communiquons/android/comunic/client/MainActivity.java
+++ b/app/src/main/java/org/communiquons/android/comunic/client/MainActivity.java
@@ -1,5 +1,7 @@
 package org.communiquons.android.comunic.client;
 
+import android.app.AlertDialog;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
@@ -7,6 +9,8 @@ import android.view.Menu;
 import android.view.MenuItem;
 import android.widget.Toast;
 
+import org.communiquons.android.comunic.client.api.APIRequestTask;
+
 public class MainActivity extends AppCompatActivity {
 
     /**
@@ -26,13 +30,16 @@ public class MainActivity extends AppCompatActivity {
 
         //Initialize account object
         account = new Account(this);
+    }
+
+    @Override
+    protected void onStart() {
+        super.onStart();
 
         //Check if user is signed in or not
         if(!account.signed_in()){
-
             //Open the login activity
-            Intent intent = new Intent(this, LoginActivity.class);
-            startActivity(intent);
+            startActivity(new Intent(this, LoginActivity.class));
         }
     }
 
@@ -65,6 +72,31 @@ public class MainActivity extends AppCompatActivity {
      * Ask user to confirm if he really what to sign out or not
      */
     void confirmUserLogout(){
-        Toast.makeText(this, "Do you really want to signout ???", Toast.LENGTH_SHORT).show();
+        AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        builder.setTitle(R.string.popup_signout_title)
+                .setMessage(R.string.popup_signout_message)
+                .setCancelable(true)
+                .setPositiveButton(R.string.popup_signout_confirm_button,
+                        new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+
+                        //Sign out user
+                        account.sign_out();
+
+                        //Redirect to login activity
+                        startActivity(new Intent(MainActivity.this, LoginActivity.class));
+
+                    }
+                })
+                .setNegativeButton(R.string.popup_signout_cancel_button, new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        //Nothing now
+                    }
+                })
+
+                //Show popup
+                .create().show();
     }
 }
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 678d6ad..8e7377d 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -10,4 +10,8 @@
     <string name="err_no_internet_connection">No Internet connexion !</string>
     <string name="activity_login_err_server_response">The server sent an unexcepted response…</string>
     <string name="main_menu_logout">Sign out</string>
+    <string name="popup_signout_title">Sign out</string>
+    <string name="popup_signout_message">Are you sure do you want to sign out ?</string>
+    <string name="popup_signout_confirm_button">Sign out</string>
+    <string name="popup_signout_cancel_button">Cancel</string>
 </resources>