diff --git a/apps/graph/graph/tangent_graph_controller.cpp b/apps/graph/graph/tangent_graph_controller.cpp
index c7af689c6..4c7808c8b 100644
--- a/apps/graph/graph/tangent_graph_controller.cpp
+++ b/apps/graph/graph/tangent_graph_controller.cpp
@@ -61,7 +61,7 @@ void TangentGraphController::reloadBannerView() {
   if (m_record.isNull()) {
     return;
   }
-  FunctionBannerDelegate::reloadBannerViewForCursorOnFunction(m_cursor, m_record, app()->functionStore(), CartesianFunction::Symbol());
+  FunctionBannerDelegate::reloadBannerViewForCursorOnFunction(m_cursor, m_record, Shared::FunctionApp::app()->functionStore(), CartesianFunction::Symbol());
   GraphControllerHelper::reloadDerivativeInBannerViewForCursorOnFunction(m_cursor, m_record);
   constexpr size_t bufferSize = FunctionBannerDelegate::k_maxNumberOfCharacters+PrintFloat::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits);
   char buffer[bufferSize];
diff --git a/apps/sequence/list/list_controller.cpp b/apps/sequence/list/list_controller.cpp
index b7cf89ec3..dad72cdd7 100644
--- a/apps/sequence/list/list_controller.cpp
+++ b/apps/sequence/list/list_controller.cpp
@@ -107,7 +107,7 @@ void ListController::editExpression(int sequenceDefinition, Ion::Events::Event e
     // Replace UCodePointUnknownN with 'n'
     replaceUnknownSymbolWithReadableSymbol(initialText);
   }
-  InputViewController * inputController = app()->inputViewController();
+  InputViewController * inputController = Shared::FunctionApp::app()->inputViewController();
   // Invalidate the sequences context cache
   app()->localContext()->resetCache();
   switch (sequenceDefinition) {
diff --git a/apps/shared/function_app.h b/apps/shared/function_app.h
index 687e6185a..932ed30dd 100644
--- a/apps/shared/function_app.h
+++ b/apps/shared/function_app.h
@@ -30,7 +30,10 @@ public:
     uint32_t m_modelVersion;
     uint32_t m_rangeVersion;
     Poincare::Preferences::AngleUnit m_angleUnitVersion;
- };
+  };
+  static FunctionApp * app() {
+    return static_cast<FunctionApp *>(::app());
+  }
   virtual ~FunctionApp() = default;
   virtual FunctionStore * functionStore() { return static_cast<FunctionApp::Snapshot *>(snapshot())->functionStore(); }
   virtual InputViewController * inputViewController() = 0;
diff --git a/apps/shared/function_go_to_parameter_controller.cpp b/apps/shared/function_go_to_parameter_controller.cpp
index 73fbbee44..153bd3df7 100644
--- a/apps/shared/function_go_to_parameter_controller.cpp
+++ b/apps/shared/function_go_to_parameter_controller.cpp
@@ -22,7 +22,7 @@ double FunctionGoToParameterController::parameterAtIndex(int index) {
 
 bool FunctionGoToParameterController::setParameterAtIndex(int parameterIndex, double f) {
   assert(parameterIndex == 0);
-  FunctionApp * myApp = (FunctionApp *)app();
+  FunctionApp * myApp = FunctionApp::app();
   ExpiringPointer<Function> function = myApp->functionStore()->modelForRecord(m_record);
   float y = function->evaluateAtAbscissa(f, myApp->localContext());
   m_cursor->moveTo(f, y);
diff --git a/apps/shared/function_graph_controller.cpp b/apps/shared/function_graph_controller.cpp
index 4a272e247..5c1b876bd 100644
--- a/apps/shared/function_graph_controller.cpp
+++ b/apps/shared/function_graph_controller.cpp
@@ -111,8 +111,7 @@ double FunctionGraphController::defaultCursorAbscissa() {
 }
 
 FunctionStore * FunctionGraphController::functionStore() const {
-  FunctionApp * myApp = static_cast<FunctionApp *>(app());
-  return myApp->functionStore();
+  return FunctionApp::app()->functionStore();
 }
 
 void FunctionGraphController::initCursorParameters() {
diff --git a/apps/shared/function_list_controller.cpp b/apps/shared/function_list_controller.cpp
index c2e9dee28..e6dc2d9fb 100644
--- a/apps/shared/function_list_controller.cpp
+++ b/apps/shared/function_list_controller.cpp
@@ -249,13 +249,11 @@ TabViewController * FunctionListController::tabController() const {
 }
 
 FunctionStore * FunctionListController::modelStore() {
-  FunctionApp * myApp = static_cast<FunctionApp *>(app());
-  return myApp->functionStore();
+  return FunctionApp::app()->functionStore();
 }
 
 InputViewController * FunctionListController::inputController() {
-  FunctionApp * myApp = static_cast<FunctionApp *>(app());
-  return myApp->inputViewController();
+  return FunctionApp::app()->inputViewController();
 }
 
 KDCoordinate FunctionListController::maxFunctionNameWidth() {
diff --git a/apps/shared/list_parameter_controller.cpp b/apps/shared/list_parameter_controller.cpp
index 567fa053c..479d13741 100644
--- a/apps/shared/list_parameter_controller.cpp
+++ b/apps/shared/list_parameter_controller.cpp
@@ -112,8 +112,7 @@ ExpiringPointer<Function> ListParameterController::function() {
 }
 
 FunctionStore * ListParameterController::functionStore() {
-  FunctionApp * a = static_cast<FunctionApp *>(app());
-  return a->functionStore();
+  return FunctionApp::app()->functionStore();
 }
 
 
diff --git a/apps/shared/sum_graph_controller.cpp b/apps/shared/sum_graph_controller.cpp
index 559809812..b08914e53 100644
--- a/apps/shared/sum_graph_controller.cpp
+++ b/apps/shared/sum_graph_controller.cpp
@@ -66,7 +66,7 @@ bool SumGraphController::handleEvent(Ion::Events::Event event) {
 }
 
 bool SumGraphController::moveCursorHorizontallyToPosition(double x) {
-  FunctionApp * myApp = static_cast<FunctionApp *>(app());
+  FunctionApp * myApp = FunctionApp::app();
   assert(!m_record.isNull());
   ExpiringPointer<Function> function = myApp->functionStore()->modelForRecord(m_record);
   double y = function->evaluateAtAbscissa(x, myApp->localContext());
@@ -138,7 +138,7 @@ void SumGraphController::reloadBannerView() {
   double result;
   Poincare::Layout functionLayout;
   if (m_step == Step::Result) {
-    FunctionApp * myApp = static_cast<FunctionApp *>(app());
+    FunctionApp * myApp = FunctionApp::app();
     assert(!m_record.isNull());
     ExpiringPointer<Function> function = myApp->functionStore()->modelForRecord(m_record);
     result = function->sumBetweenBounds(m_startSum, m_endSum, myApp->localContext());
diff --git a/apps/shared/values_controller.cpp b/apps/shared/values_controller.cpp
index 559faa97e..be80085bc 100644
--- a/apps/shared/values_controller.cpp
+++ b/apps/shared/values_controller.cpp
@@ -336,8 +336,7 @@ void ValuesController::updateNumberOfColumns() {
 }
 
 FunctionStore * ValuesController::functionStore() const {
-  FunctionApp * myApp = static_cast<FunctionApp *>(app());
-  return myApp->functionStore();
+  return FunctionApp::app()->functionStore();
 }
 
 }
diff --git a/apps/shared/values_function_parameter_controller.cpp b/apps/shared/values_function_parameter_controller.cpp
index 059c9a34e..4f68ad405 100644
--- a/apps/shared/values_function_parameter_controller.cpp
+++ b/apps/shared/values_function_parameter_controller.cpp
@@ -9,8 +9,7 @@ const char * ValuesFunctionParameterController::title() {
 }
 
 void ValuesFunctionParameterController::viewWillAppear() {
-  FunctionApp * myApp = static_cast<FunctionApp *>(app());
-  myApp->functionStore()->modelForRecord(m_record)->nameWithArgument(m_pageTitle, Function::k_maxNameWithArgumentSize, m_symbol);
+  FunctionApp::app()->functionStore()->modelForRecord(m_record)->nameWithArgument(m_pageTitle, Function::k_maxNameWithArgumentSize, m_symbol);
 }
 
 void ValuesFunctionParameterController::didBecomeFirstResponder() {