diff --git a/app_win_2_back.cpp b/app_win_2_back.cpp
index e42fc17..0c44c12 100644
--- a/app_win_2_back.cpp
+++ b/app_win_2_back.cpp
@@ -1,8 +1,8 @@
 #include "app_win_2_back.hpp"
 #include "hello_world.hpp"
-#include <iostream>
 #include <glibmm/miscutils.h>
 #include <gtkmm/switch.h>
+#include <spdlog/spdlog.h>
 
 namespace gui_to_app {
     AppWin2Back::AppWin2Back() : Gtk::Application("org.billy_adventures.character_sheet", Flags::HANDLES_OPEN) {
@@ -16,12 +16,12 @@ namespace gui_to_app {
                 const auto builder = Gtk::Builder::create_from_file("menu_bar.ui");
                 return builder->get_object<Gio::Menu>("menu");
             } catch (const std::exception &e) {
-                std::cerr << e.what() << '\n';
+                spdlog::error("Error occurred while loader menu bar: {}", e.what());
                 return nullptr;
             }
         }();
         if (!menu_bar) {
-            std::cerr << "Error occured while loading menu bar's.\n";
+            spdlog::error("Error occured while loading menu bar's.");
         } else {
             set_menubar(menu_bar);
             add_action("quit", sigc::mem_fun(*this, &AppWin2Back::on_quit));
@@ -40,13 +40,13 @@ namespace gui_to_app {
             try {
                 return Gtk::Builder::create_from_file("window_ui.ui");
             } catch (const std::exception &e) {
-                std::cerr << e.what() << std::endl;
+                spdlog::critical("Error occurred while loading Window's UI: {}", e.what());
                 quit();
                 return nullptr;
             }
         }();
         if (!app_builder) {
-            std::cerr << "Error while loading UI.\n";
+            spdlog::critical("Error while loading UI");
             quit();
             return;
         }
@@ -56,6 +56,7 @@ namespace gui_to_app {
             main_window->set_show_menubar(true);
             main_window->set_visible(true);
         } else {
+            spdlog::critical("Error while getting window from builder");
             on_quit();
             return;
         }
@@ -97,9 +98,9 @@ namespace gui_to_app {
             return test_result;
         }();
         if (!test_result.empty()) {
-            std::cerr << "Error occurred, at least one switch is not available:\n";
+            spdlog::critical("Error occurred, at least one switch is not available. See logs below");
             for (const auto result: test_result) {
-                std::cerr << result << '\n';
+                spdlog::critical(result);
             }
             on_quit();
             return;