diff --git a/api/extapp_api.c b/api/extapp_api.c
index 4d665e259..888420761 100644
--- a/api/extapp_api.c
+++ b/api/extapp_api.c
@@ -4,6 +4,32 @@
 
 extern void (* const *_api_base)(void);
 
+// We need to redefine DataTime struct to match the one in extapp_api.h file, because we can't include it directly
+struct DateTime {
+  int tm_sec;
+  int tm_min;
+  int tm_hour; // 0-23
+  int tm_mday; // 1-31
+  int tm_mon;  // 1-12
+  int tm_year;
+  int tm_wday; // 0-6, 0 is Monday
+};
+
+// Settings
+struct Settings {
+  // 0 for degrees, 1 for radians, 2 for gradians
+  uint8_t angleUnit;
+  // 0 for decimal, 1 for Scientific, 2 for Engineering
+  uint8_t displayMode;
+  // Raw number of digits, max is 14
+  uint8_t numberOfSignificantDigits;
+  // 0 for real, 1 for cartesian, 2 for polar
+  uint8_t complexFormat;
+  // If true, the big font should be used.
+  bool largeFont;
+};
+
+
 uint64_t extapp_millis() {
   return ((uint64_t (*)(void))_api_base[0])();
 }
@@ -96,6 +122,95 @@ bool extapp_writememory(unsigned char * dest,const unsigned char * data,size_t l
   return ((bool (*)(unsigned char *, const unsigned char *, size_t))_api_base[22])(dest,data,length);
 }
 
-bool extapp_inexammode(){
+bool extapp_inExamMode(){
   return ((bool (*)(void ))_api_base[23])();
 }
+
+uint8_t extapp_getBrightness(){
+  return ((uint8_t (*)(void ))_api_base[24])();
+}
+
+void extapp_setBrightness(uint8_t brightness){
+  ((void (*)(uint8_t))_api_base[25])(brightness);
+}
+
+int extapp_batteryLevel(){
+  return ((int (*)(void ))_api_base[26])();
+}
+
+float extapp_batteryVoltage(){
+  return ((float (*)(void ))_api_base[27])();
+}
+
+bool extapp_batteryCharging(){
+  return ((bool (*)(void ))_api_base[28])();
+}
+
+int extapp_batteryPercentage(){
+  return ((int (*)(void ))_api_base[29])();
+}
+
+struct DateTime extapp_getDateTime(){
+  return ((struct DateTime (*)(void ))_api_base[30])();
+}
+
+void extapp_setDateTime(struct DateTime dt){
+  ((void (*)(struct DateTime))_api_base[31])(dt);
+}
+
+void extapp_setRTCMode(int mode){
+  ((void (*)(int))_api_base[32])(mode);
+}
+
+int extapp_getRTCMode(){
+  return ((int (*)(void ))_api_base[33])();
+}
+
+void extapp_getTime(struct DateTime *dt){
+  ((void (*)(struct DateTime *))_api_base[34])(dt);
+}
+
+uint32_t extapp_random(){
+  return ((uint32_t (*)(void ))_api_base[35])();
+}
+
+void extapp_reloadTitleBar(){
+  ((void (*)(void ))_api_base[36])();
+}
+
+const char * extapp_username(){
+  return ((const char * (*)(void ))_api_base[37])();
+}
+
+const char * extapp_getOS(){
+  return ((const char * (*)(void ))_api_base[38])();
+}
+
+const char * extapp_getOSVersion(){
+  return ((const char * (*)(void ))_api_base[39])();
+}
+
+void extapp_getOSCommit(char *commit){
+  ((void (*)(char *))_api_base[40])(commit);
+}
+
+size_t extapp_storageSize(){
+  return ((size_t (*)(void ))_api_base[41])();
+}
+
+size_t extapp_storageAvailable(){
+  return ((size_t (*)(void ))_api_base[42])();
+}
+
+size_t extapp_storageUsed(){
+  return ((size_t (*)(void ))_api_base[43])();
+}
+
+
+struct Settings extapp_getSettings(){
+  return ((struct Settings (*)(void ))_api_base[44])();
+}
+
+void extapp_setSettings(struct Settings settings){
+  ((void (*)(struct Settings))_api_base[45])(settings);
+}
diff --git a/api/extapp_api.h b/api/extapp_api.h
index ebd7f2c82..6f3811772 100644
--- a/api/extapp_api.h
+++ b/api/extapp_api.h
@@ -5,7 +5,7 @@
 #include <stddef.h>
 #include <stdbool.h>
 
-#define API_VERSION 2
+#define API_VERSION 3
 
 #ifdef __cplusplus
 #define EXTERNC extern "C"
@@ -244,6 +244,33 @@
 #define KEY_PRGM_SHIFT 78
 #define KEY_PRGM_MENU 48
 
+// Types definitions
+// Date and time
+struct DateTime {
+  int tm_sec;
+  int tm_min;
+  int tm_hour; // 0-23
+  int tm_mday; // 1-31
+  int tm_mon;  // 1-12
+  int tm_year;
+  int tm_wday; // 0-6, 0 is Monday
+};
+
+// Settings
+// TODO: Improve this structure when using C++
+struct Settings {
+  // 0 for degrees, 1 for radians, 2 for gradians
+  uint8_t angleUnit;
+  // 0 for decimal, 1 for Scientific, 2 for Engineering
+  uint8_t displayMode;
+  // Raw number of digits, max is 14
+  uint8_t numberOfSignificantDigits;
+  // 0 for real, 1 for cartesian, 2 for polar
+  uint8_t complexFormat;
+  // If true, the big font should be used.
+  bool largeFont;
+};
+
 // External API functions
 /**
  * Get the current date, in milliseconds, from the boot, excluding suspended time
@@ -408,7 +435,118 @@ EXTERNC  bool extapp_writesector(unsigned char * dest,const unsigned char * data
  * Get if the exam mode is active
  * @return bool, true if the exam mode is active
  */
-EXTERNC  bool extapp_inexammode();
+EXTERNC  bool extapp_inExamMode();
+/**
+ * Get the actual brightness
+ * @return uint8_t, the actual brightness
+ */
+EXTERNC  uint8_t extapp_getBrightness();
+/**
+ * Set the brightness
+ * @param brightness uint8_t, the brightness to set
+ */
+EXTERNC  void extapp_setBrightness(uint8_t brightness);
+/**
+ * Get the battery level (0-3, 0 is empty, 1 is low, 2 is somewhere in between, 3 is full)
+ * @return int, the battery level
+ */
+EXTERNC  int extapp_batteryLevel();
+/**
+ * Get the battery voltage (in V)
+ * @return float, the battery voltage
+ */
+EXTERNC  float extapp_batteryVoltage();
+/**
+ * Get if the battery is charging
+ * @return bool, true if the battery is charging
+ */
+EXTERNC  bool extapp_batteryCharging();
+/**
+ * Get battery percentage (0-100), computed from battery voltage
+ * @return int, the battery percentage
+ */
+EXTERNC  int extapp_batteryPercentage();
+/**
+ * Get the current RTC time
+ * @return DateTime, the current RTC time
+ */
+EXTERNC struct DateTime extapp_getDateTime();
+
+/**
+ * Set the RTC time
+ * @param dt DateTime, the time to set
+ */
+EXTERNC  void extapp_setDateTime(struct DateTime dt);
+/**
+ * Set the RTC mode (0 for disabled, 1 for LSI (low consumption), 2 for HSE (high precision))
+ * @param mode int, the mode to set
+ */
+EXTERNC  void extapp_setRTCMode(int mode);
+/**
+ * Get the RTC mode (0 for disabled, 1 for LSI (low consumption), 2 for HSE (high precision))
+ * @return int, the RTC mode
+ */
+EXTERNC  int extapp_getRTCMode();
+/**
+ * Get the current time from 2000-01-01 00:00:00
+ * @return uint64_t, the current time from 2000-01-01 00:00:00
+ */
+EXTERNC  uint64_t extapp_getTime();
+/**
+ * Get a 32 bit true random number that can be casted to any (32 bit or less) type
+ * @return uint32_t, the random number
+ */
+EXTERNC  uint32_t extapp_random();
+/**
+ * Reload the title bar
+ */
+EXTERNC  void extapp_reloadTitleBar();
+/**
+ * Get the username
+ * @return const char *, the username
+ */
+EXTERNC  const char * extapp_username();
+/**
+ * Get the OS name
+ * @return const char *, the OS name
+ */
+EXTERNC  const char * extapp_getOS();
+/**
+ * Get the OS version
+ * @return const char *, the OS version
+ */
+EXTERNC  const char * extapp_getOSVersion();
+/**
+ * Get the OS commit hash
+ * @return const char *, the OS commit hash
+ */
+EXTERNC  const char * extapp_getOSCommit();
+/**
+ * Get the RAM storage size
+ * @return size_t, the RAM storage size
+ */
+EXTERNC  size_t extapp_storageSize();
+/**
+ * Get the available RAM storage size
+ * @return size_t, the available RAM storage size
+ */
+EXTERNC  size_t extapp_storageAvailable();
+/**
+ * Get the used RAM storage size
+ * @return size_t, the used RAM storage size
+ */
+EXTERNC  size_t extapp_storageUsed();
+/**
+ * Get the settings
+ * @return struct Settings, the settings
+ */
+EXTERNC  struct Settings extapp_getSettings();
+/**
+ * Set the settings
+ * @param settings struct Settings, the settings to set
+ */
+EXTERNC  void extapp_setSettings(struct Settings settings);
+
 EXTERNC uint32_t _heap_size;
 EXTERNC void *_heap_base;
 EXTERNC void *_heap_ptr;
diff --git a/api/extapp_startup.c b/api/extapp_startup.c
index 4038f055e..512f08af9 100644
--- a/api/extapp_startup.c
+++ b/api/extapp_startup.c
@@ -15,14 +15,14 @@ extern char _bss_section_end_ram;
 extern cxx_constructor _init_array_start;
 extern cxx_constructor _init_array_end;
 
-extern void extapp_main(void);
+extern void extapp_main(int argc, char *argv[]);
 
 void *_heap_base, *_heap_ptr;
 const void *_api_base;
 uint32_t _heap_size;
 jmp_buf oom_jmp_buf;
 
-uint32_t _extapp_start(const uint32_t api_version, const void * api_base, void * heap, const uint32_t heap_size) {
+uint32_t _extapp_start(const uint32_t api_version, const void * api_base, void * heap, const uint32_t heap_size, int argc, char * argv[]) {
 
   if(api_version != API_VERSION) {
     return 1;
@@ -43,7 +43,7 @@ uint32_t _extapp_start(const uint32_t api_version, const void * api_base, void *
     for (cxx_constructor * c = &_init_array_start; c<&_init_array_end; c++) {
       (*c)();
     }
-    extapp_main();
+    extapp_main(argc, argv);
   }
 
   return result;
diff --git a/apps/BadApple/app.elf b/apps/BadApple/app.elf
index d1c64da18..0034c8707 100644
Binary files a/apps/BadApple/app.elf and b/apps/BadApple/app.elf differ
diff --git a/apps/BadApple/sample.c b/apps/BadApple/sample.c
index 73555b5c3..ccd5bb114 100644
--- a/apps/BadApple/sample.c
+++ b/apps/BadApple/sample.c
@@ -5,7 +5,7 @@
 
 #include "vdo.h"
 
-void extapp_main() {
+void extapp_main(int argc, char * argv[]) {
     for(unsigned int len = 0; len < vdo_len;) {
         uint64_t start = extapp_millis();
         extapp_waitForVBlank();
diff --git a/apps/CHIP-8/app.elf b/apps/CHIP-8/app.elf
index 9909f6786..f30e56056 100644
Binary files a/apps/CHIP-8/app.elf and b/apps/CHIP-8/app.elf differ
diff --git a/apps/CHIP-8/main.c b/apps/CHIP-8/main.c
index c353e7ac9..14bb99054 100644
--- a/apps/CHIP-8/main.c
+++ b/apps/CHIP-8/main.c
@@ -8,7 +8,7 @@
 #include "inc/peripherals.h"
 #include "inc/selector.h"
 
-void extapp_main(void) {
+void extapp_main(int argc, char * argv[]) {
     char * rom_filename = select_rom();
 
     init_display();
diff --git a/apps/Example-Cpp/app.elf b/apps/Example-Cpp/app.elf
index 5d628750d..f2fe030d0 100644
Binary files a/apps/Example-Cpp/app.elf and b/apps/Example-Cpp/app.elf differ
diff --git a/apps/Example-Cpp/main.cpp b/apps/Example-Cpp/main.cpp
index 5f89ec852..9026614ac 100644
--- a/apps/Example-Cpp/main.cpp
+++ b/apps/Example-Cpp/main.cpp
@@ -6,9 +6,9 @@
 #include "inc/peripherals.h"
 #include "inc/selector.h"
 
-extern "C" void extapp_main();
+extern "C" void extapp_main(int argc, char *argv[]);
 
-void extapp_main(void) {
+void extapp_main(int argc, char * argv[]) {
 
     // Wait for the key to be released before starting the application
     Peripherals::waitForKeyReleased();
diff --git a/apps/Example/app.elf b/apps/Example/app.elf
index 37fc24acd..a3b5d696c 100644
Binary files a/apps/Example/app.elf and b/apps/Example/app.elf differ
diff --git a/apps/Example/main.c b/apps/Example/main.c
index 5efa9a1c8..e71a18c2a 100644
--- a/apps/Example/main.c
+++ b/apps/Example/main.c
@@ -6,7 +6,7 @@
 #include "inc/peripherals.h"
 #include "inc/selector.h"
 
-void extapp_main(void) {
+void extapp_main(int argc, char * argv[]) {
 
     // Wait for the key to be released before starting the application
     waitForKeyReleased();
diff --git a/apps/HexEdit/app.elf b/apps/HexEdit/app.elf
index 7de857055..1e897ba5f 100644
Binary files a/apps/HexEdit/app.elf and b/apps/HexEdit/app.elf differ
diff --git a/apps/HexEdit/main.c b/apps/HexEdit/main.c
index 06954b680..71dde9554 100644
--- a/apps/HexEdit/main.c
+++ b/apps/HexEdit/main.c
@@ -132,7 +132,7 @@ void handle_scroll(int delta) {
     draw_ui();
 }
 
-void extapp_main()
+void extapp_main(int argc, char * argv[])
 {
     extapp_pushRectUniform(0, 0, LCD_WIDTH, LCD_HEIGHT, 0xFFFF);
     draw_ui();
diff --git a/apps/KhiCAS/README.md b/apps/KhiCAS/README.md
index 39953d41d..a40aacc6e 100644
--- a/apps/KhiCAS/README.md
+++ b/apps/KhiCAS/README.md
@@ -21,6 +21,8 @@ bool iskeydown(int key) {
 }
 ```
 
-7. If you have build error, please check if the Makfile is modified. If yes, restore the file to the original state.
-8. You can try to run `make cleanall` in the folder `apps/KhiCAS` to clean the build and rebuild the program.
-9. If it continues to crash, please ask for help in an issue on the GitHub repository or on the Discord server.
+7. Rename `extapp_inexammode` to `extapp_inExamMode` in the file `apps/KhiCAS/main.cpp`
+8. Replace `void extapp_main() {` by `void extapp_main(int argc, char * argv[]) {` in the file `apps/KhiCAS/main.cpp`
+9. If you have build error, please check if the Makfile is modified. If yes, restore the file to the original state.
+10. You can try to run `make cleanall` in the folder `apps/KhiCAS` to clean the build and rebuild the program.
+11. If it continues to crash, please ask for help in an issue on the GitHub repository or on the Discord server.
diff --git a/apps/KhiCAS/app.elf b/apps/KhiCAS/app.elf
index c78186864..ef6dfc191 100644
Binary files a/apps/KhiCAS/app.elf and b/apps/KhiCAS/app.elf differ
diff --git a/apps/KhiCAS/src/main.cpp b/apps/KhiCAS/src/main.cpp
index 1ff6953c9..2aa401bcb 100644
--- a/apps/KhiCAS/src/main.cpp
+++ b/apps/KhiCAS/src/main.cpp
@@ -22,7 +22,7 @@ extern "C" const char * mp_hal_input(const char * prompt) {
 extern "C" {
 
 int ext_main();
-void extapp_main() {
+void extapp_main(int argc, char * argv[]) {
   ext_main();
 }
 
@@ -203,7 +203,7 @@ void GetKey(int * key) {
 }
 
 bool inexammode(){
-  return extapp_inexammode();
+  return extapp_inExamMode();
 }
 
 } // end extern "C"
diff --git a/apps/Nofrendo/app.elf b/apps/Nofrendo/app.elf
index 7c629bcf3..d0cad66b1 100644
Binary files a/apps/Nofrendo/app.elf and b/apps/Nofrendo/app.elf differ
diff --git a/apps/Nofrendo/epsilon/main.c b/apps/Nofrendo/epsilon/main.c
index 3e7aab732..febbe5b32 100644
--- a/apps/Nofrendo/epsilon/main.c
+++ b/apps/Nofrendo/epsilon/main.c
@@ -122,7 +122,7 @@ static const char * select_rom() {
 	}
 }
 
-void extapp_main() {
+void extapp_main(int argc, char * argv[]) {
   //Create commandline args
   const char *args[3];
   args[0]="nofrendo";
diff --git a/apps/Peanut-GB/app.elf b/apps/Peanut-GB/app.elf
index 619e9a857..c7723d574 100644
Binary files a/apps/Peanut-GB/app.elf and b/apps/Peanut-GB/app.elf differ
diff --git a/apps/Peanut-GB/main.c b/apps/Peanut-GB/main.c
index 6305696b1..0ca0e8b0b 100644
--- a/apps/Peanut-GB/main.c
+++ b/apps/Peanut-GB/main.c
@@ -160,7 +160,7 @@ static bool wasMSpFPressed = false;
 static uint8_t saveCooldown = 0;
 static bool MSpFfCounter = false;
 
-void extapp_main() {
+void extapp_main(int argc, char * argv[]) {
   struct gb_s gb;
   enum gb_init_error_e gb_ret;
   struct priv_t priv = {
diff --git a/apps/Periodic/app.elf b/apps/Periodic/app.elf
index 87b07fa7d..66e426cfa 100644
Binary files a/apps/Periodic/app.elf and b/apps/Periodic/app.elf differ
diff --git a/apps/Periodic/periodic.c b/apps/Periodic/periodic.c
index ebefaaa41..cedee60df 100644
--- a/apps/Periodic/periodic.c
+++ b/apps/Periodic/periodic.c
@@ -237,7 +237,7 @@ void copy(const char * text) {
   extapp_msleep(500);
 }
 
-void extapp_main(void) {
+void extapp_main(int argc, char * argv[]) {
   char buf[128];
   bool partial_draw = false, redraw = true;
   int cursor_pos = 0;
diff --git a/apps/UnitCircle/app.elf b/apps/UnitCircle/app.elf
index e03fc9fb0..fc8819e61 100644
Binary files a/apps/UnitCircle/app.elf and b/apps/UnitCircle/app.elf differ
diff --git a/apps/UnitCircle/main.c b/apps/UnitCircle/main.c
index 579675c83..fe0612367 100644
--- a/apps/UnitCircle/main.c
+++ b/apps/UnitCircle/main.c
@@ -6,7 +6,7 @@
 #include "inc/peripherals.h"
 #include "inc/selector.h"
 
-void extapp_main(void) {
+void extapp_main(int argc, char * argv[]) {
 
     // Wait for the key to be released before starting the application
     waitForKeyReleased();