diff --git a/apps/apps_container.cpp b/apps/apps_container.cpp
index 5e189b92d..8a6f9b619 100644
--- a/apps/apps_container.cpp
+++ b/apps/apps_container.cpp
@@ -8,9 +8,9 @@ AppsContainer::AppsContainer() :
   Container(),
   m_window(AppsWindow()),
   m_homeApp(this),
-  m_graphApp(this, &m_globalContext, &m_preferences),
+  m_graphApp(this, &m_globalContext),
   m_probabilityApp(this),
-  m_calculationApp(this, &m_globalContext, &m_preferences),
+  m_calculationApp(this, &m_globalContext),
   m_regressionApp(this),
   m_settingsApp(this, &m_preferences),
   m_statisticsApp(this),
@@ -46,6 +46,10 @@ Context * AppsContainer::globalContext() {
   return &m_globalContext;
 }
 
+Preferences * AppsContainer::preferences() {
+  return &m_preferences;
+}
+
 ToolboxController * AppsContainer::toolboxController() {
   return &m_toolboxController;
 }
diff --git a/apps/apps_container.h b/apps/apps_container.h
index fa1c8185c..c9c8801b1 100644
--- a/apps/apps_container.h
+++ b/apps/apps_container.h
@@ -25,6 +25,7 @@ public:
   int numberOfApps();
   App * appAtIndex(int index);
   Context * globalContext();
+  Preferences * preferences();
   ToolboxController * toolboxController();
   VariableBoxController * variableBoxController();
   bool handleEvent(Ion::Events::Event event) override;
diff --git a/apps/calculation/app.cpp b/apps/calculation/app.cpp
index 737c56172..aa703240b 100644
--- a/apps/calculation/app.cpp
+++ b/apps/calculation/app.cpp
@@ -3,10 +3,9 @@
 
 namespace Calculation {
 
-App::App(Container * container, Context * context, Preferences * preferences) :
+App::App(Container * container, Context * context) :
   TextFieldDelegateApp(container, &m_editExpressionController, "Calculs", "CALCULS", ImageStore::CalculationIcon),
   m_localContext(LocalContext((GlobalContext *)context, &m_calculationStore)),
-  m_preferences(preferences),
   m_calculationStore(CalculationStore()),
   m_historyController(HistoryController(&m_editExpressionController, &m_calculationStore)),
   m_editExpressionController(EditExpressionController(&m_modalViewController, &m_historyController, &m_calculationStore))
@@ -17,8 +16,4 @@ Context * App::localContext() {
   return &m_localContext;
 }
 
-Preferences * App::preferences() {
-  return m_preferences;
-}
-
 }
diff --git a/apps/calculation/app.h b/apps/calculation/app.h
index 5ed227e23..d16b11d57 100644
--- a/apps/calculation/app.h
+++ b/apps/calculation/app.h
@@ -5,19 +5,16 @@
 #include "local_context.h"
 #include "history_controller.h"
 #include "../text_field_delegate_app.h"
-#include "../preferences.h"
 #include <escher.h>
 
 namespace Calculation {
 
 class App : public TextFieldDelegateApp {
 public:
-  App(Container * container, Context * context, Preferences * preferences);
+  App(Container * container, Context * context);
   Context * localContext() override;
-  Preferences * preferences();
 private:
   LocalContext m_localContext;
-  Preferences * m_preferences;
   CalculationStore m_calculationStore;
   HistoryController m_historyController;
   EditExpressionController m_editExpressionController;
diff --git a/apps/calculation/edit_expression_controller.cpp b/apps/calculation/edit_expression_controller.cpp
index bc5653310..9f09c8b2d 100644
--- a/apps/calculation/edit_expression_controller.cpp
+++ b/apps/calculation/edit_expression_controller.cpp
@@ -1,5 +1,6 @@
 #include "edit_expression_controller.h"
 #include "app.h"
+#include "../apps_container.h"
 #include <assert.h>
 
 namespace Calculation {
@@ -81,7 +82,8 @@ bool EditExpressionController::textFieldDidReceiveEvent(::TextField * textField,
 
 bool EditExpressionController::textFieldDidFinishEditing(::TextField * textField, const char * text) {
   App * calculationApp = (App *)app();
-  m_calculationStore->push(textBody(), calculationApp->localContext(), calculationApp->preferences());
+  AppsContainer * appsContainer = (AppsContainer *)calculationApp->container();
+  m_calculationStore->push(textBody(), calculationApp->localContext(), appsContainer->preferences());
   m_historyController->reload();
   m_contentView.mainView()->scrollToCell(0, m_historyController->numberOfRows()-1);
   m_contentView.textField()->setText("");
diff --git a/apps/calculation/history_controller.cpp b/apps/calculation/history_controller.cpp
index 9561c2be1..fd986e0ce 100644
--- a/apps/calculation/history_controller.cpp
+++ b/apps/calculation/history_controller.cpp
@@ -1,5 +1,6 @@
 #include "history_controller.h"
 #include "app.h"
+#include "../apps_container.h"
 #include <assert.h>
 
 namespace Calculation {
@@ -70,7 +71,8 @@ bool HistoryController::handleEvent(Ion::Events::Event event) {
     }
     m_selectableTableView.deselectTable();
     App * calculationApp = (App *)app();
-    m_calculationStore->push(text, calculationApp->localContext(), calculationApp->preferences());
+    AppsContainer * appsContainer = (AppsContainer *)calculationApp->container();
+    m_calculationStore->push(text, calculationApp->localContext(), appsContainer->preferences());
     reload();
     m_selectableTableView.scrollToCell(0, numberOfRows()-1);
     app()->setFirstResponder(editController);
diff --git a/apps/graph/app.cpp b/apps/graph/app.cpp
index a4cc1f27f..be898f627 100644
--- a/apps/graph/app.cpp
+++ b/apps/graph/app.cpp
@@ -3,11 +3,10 @@
 
 namespace Graph {
 
-App::App(Container * container, Context * context, Preferences * preferences) :
+App::App(Container * container, Context * context) :
   TextFieldDelegateApp(container, &m_inputViewController, "Fonctions", "FONCTIONS", ImageStore::GraphIcon),
   m_functionStore(FunctionStore()),
   m_xContext(VariableContext('x', context)),
-  m_preferences(preferences),
   m_listController(ListController(&m_listHeader, &m_functionStore, &m_listHeader)),
   m_listHeader(HeaderViewController(nullptr, &m_listController, &m_listController)),
   m_listStackViewController(StackViewController(&m_tabViewController, &m_listHeader)),
@@ -32,8 +31,4 @@ Context * App::localContext() {
   return &m_xContext;
 }
 
-Preferences * App::preferences() {
-  return m_preferences;
-}
-
 }
diff --git a/apps/graph/app.h b/apps/graph/app.h
index 80bfa74ad..6b17e2068 100644
--- a/apps/graph/app.h
+++ b/apps/graph/app.h
@@ -8,20 +8,17 @@
 #include "list/list_controller.h"
 #include "values/values_controller.h"
 #include "../text_field_delegate_app.h"
-#include "../preferences.h"
 
 namespace Graph {
 
 class App : public TextFieldDelegateApp {
 public:
-  App(Container * container, Context * context, Preferences * preferences);
+  App(Container * container, Context * context);
   InputViewController * inputViewController();
   Context * localContext() override;
-  Preferences * preferences();
 private:
   FunctionStore m_functionStore;
   VariableContext m_xContext;
-  Preferences * m_preferences;
   ListController m_listController;
   HeaderViewController m_listHeader;
   StackViewController m_listStackViewController;
diff --git a/apps/graph/graph/graph_controller.cpp b/apps/graph/graph/graph_controller.cpp
index 27339ab4f..7f7c0abde 100644
--- a/apps/graph/graph/graph_controller.cpp
+++ b/apps/graph/graph/graph_controller.cpp
@@ -1,5 +1,6 @@
 #include "graph_controller.h"
 #include "../app.h"
+#include "../../apps_container.h"
 #include <assert.h>
 #include <math.h>
 #include <float.h>
@@ -110,11 +111,12 @@ bool GraphController::handleEnter() {
 
 void GraphController::reloadBannerView() {
   App * myApp = (App *)app();
+  AppsContainer * myContainer = (AppsContainer *)myApp->container();
   char buffer[k_maxNumberOfCharacters+Float::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits)];
   const char * legend = "x = ";
   int legendLength = strlen(legend);
   strlcpy(buffer, legend, legendLength+1);
-  Float(m_cursor.x()).convertFloatToText(buffer+ legendLength, Float::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits, myApp->preferences()->displayMode());
+  Float(m_cursor.x()).convertFloatToText(buffer+ legendLength, Float::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits, myContainer->preferences()->displayMode());
   m_bannerView.setLegendAtIndex(buffer, 0);
 
   legend = "00(x) = ";
@@ -122,7 +124,7 @@ void GraphController::reloadBannerView() {
   strlcpy(buffer, legend, legendLength+1);
   Function * f = m_functionStore->activeFunctionAtIndex(m_indexFunctionSelectedByCursor);
   buffer[1] = f->name()[0];
-  Float(m_cursor.y()).convertFloatToText(buffer+legendLength, Float::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits, myApp->preferences()->displayMode());
+  Float(m_cursor.y()).convertFloatToText(buffer+legendLength, Float::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits, myContainer->preferences()->displayMode());
   m_bannerView.setLegendAtIndex(buffer+1, 1);
 
   if (m_bannerView.displayDerivative()) {
@@ -130,7 +132,7 @@ void GraphController::reloadBannerView() {
     buffer[1] = '\'';
     App * graphApp = (Graph::App *)app();
     float y = f->approximateDerivative(m_cursor.x(), graphApp->localContext());
-    Float(y).convertFloatToText(buffer + legendLength, Float::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits, myApp->preferences()->displayMode());
+    Float(y).convertFloatToText(buffer + legendLength, Float::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits, myContainer->preferences()->displayMode());
     m_bannerView.setLegendAtIndex(buffer, 2);
   }
 }
diff --git a/apps/graph/values/values_controller.cpp b/apps/graph/values/values_controller.cpp
index bf2465200..b743ff113 100644
--- a/apps/graph/values/values_controller.cpp
+++ b/apps/graph/values/values_controller.cpp
@@ -122,8 +122,8 @@ int ValuesController::numberOfColumns() {
 }
 
 void ValuesController::willDisplayCellAtLocation(TableViewCell * cell, int i, int j) {
-  App * graphApp = (Graph::App *)app();
-  willDisplayCellAtLocationWithDisplayMode(cell, i, j, graphApp->preferences()->displayMode());
+  AppsContainer * myContainer = (AppsContainer *)app()->container();
+  willDisplayCellAtLocationWithDisplayMode(cell, i, j, myContainer->preferences()->displayMode());
   if (cellAtLocationIsEditable(i, j)) {
     return;
   }
@@ -165,11 +165,12 @@ void ValuesController::willDisplayCellAtLocation(TableViewCell * cell, int i, in
   // The cell is a value cell
   EvenOddBufferTextCell * myValueCell = (EvenOddBufferTextCell *)cell;
   Function * function = functionAtColumn(i);
+  App * graphApp = (Graph::App *)app();
   float x = m_interval.element(j-1);
   if (isDerivativeColumn(i)) {
-    Float(function->approximateDerivative(x, graphApp->localContext())).convertFloatToText(buffer, Float::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits, graphApp->preferences()->displayMode());
+    Float(function->approximateDerivative(x, graphApp->localContext())).convertFloatToText(buffer, Float::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits, myContainer->preferences()->displayMode());
   } else {
-    Float(function->evaluateAtAbscissa(x, graphApp->localContext())).convertFloatToText(buffer, Float::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits, graphApp->preferences()->displayMode());
+    Float(function->evaluateAtAbscissa(x, graphApp->localContext())).convertFloatToText(buffer, Float::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits), Constant::LargeNumberOfSignificantDigits, myContainer->preferences()->displayMode());
   }
   myValueCell->setText(buffer);
 }