diff --git a/appinfo.json b/appinfo.json
index 43c9af3..98d36f4 100644
--- a/appinfo.json
+++ b/appinfo.json
@@ -1,14 +1,15 @@
 {
     "appKeys": {
         "background_color": 4,
+        "eu_date": 1,
+        "invert": 9,
         "large_mode": 0,
         "leading_zero": 3,
         "number_base_color": 5,
         "number_variation": 6,
         "ornament_base_color": 7,
         "ornament_variation": 8,
-        "quick_start": 2,
-        "us_date": 1
+        "quick_start": 2
     },
     "capabilities": [
         "configurable"
diff --git a/src/pebble-app.js b/src/pebble-app.js
index 9a1dfc6..db7e522 100644
--- a/src/pebble-app.js
+++ b/src/pebble-app.js
@@ -1,11 +1,41 @@
-Pebble.addEventListener('showConfiguration', function(e) {
-  Pebble.openURL('http://hexahedria.com/misc/squared3config');
+Pebble.addEventListener('ready', function() {
+    console.log('PebbleKit JS ready!');
 });
 
-Pebble.addEventListener('webviewclosed',
-  function(e) {
-    var configuration = JSON.parse(decodeURIComponent(e.response));
-    console.log('Configuration window returned: ', JSON.stringify(configuration));
-    Pebble.sendAppMessage(configuration);
-  }
-);
\ No newline at end of file
+Pebble.addEventListener('showConfiguration', function() {
+    var watch;
+    if(Pebble.getActiveWatchInfo) {
+      watch = Pebble.getActiveWatchInfo();
+    }
+    var url='http://pebble.lastfuture.de/config/squared40/';
+    if (watch.platform == "basalt") {
+      url += "?rect=true";
+    } else if (watch.platform == "aplite") {
+      url += "?rect=true&bw=true";
+    }
+    console.log('Showing configuration page: '+url);
+    Pebble.openURL(url);
+});
+
+Pebble.addEventListener('webviewclosed', function(e) {
+    var configData = JSON.parse(decodeURIComponent(e.response));
+    console.log('Configuration page returned: '+JSON.stringify(configData));
+    if (configData.background_color) {
+        Pebble.sendAppMessage({
+            large_mode: 0+(configData.large_mode === 'true'),
+            eu_date: 0+(configData.eu_date === 'true'),
+            quick_start: 0+(configData.quick_start === 'true'),
+            leading_zero: 0+(configData.leading_zero === 'true'),
+            background_color: configData.background_color,
+            number_base_color: configData.number_base_color,
+            number_variation: configData.number_variation,
+            ornament_base_color: configData.ornament_base_color,
+            ornament_variation: configData.ornament_variation,
+            invert: 0+(configData.invert === 'true')
+        }, function() {
+            console.log('Send successful!');
+        }, function() {
+            console.log('Send failed!');
+        });
+    }
+});
\ No newline at end of file
diff --git a/src/squared.c b/src/squared.c
index c3308a5..724f880 100644
--- a/src/squared.c
+++ b/src/squared.c
@@ -11,7 +11,7 @@ Window *window;
 
 typedef struct {
   bool large_mode;
-  bool us_date;
+  bool eu_date;
   bool quick_start;
   bool leading_zero;
   int background_color;
@@ -19,13 +19,14 @@ typedef struct {
   bool number_variation;
   int ornament_base_color;
   bool ornament_variation;
+  bool invert;
 } Preferences;
 
 Preferences curPrefs;
 
 enum {
     KEY_LARGE_MODE,
-    KEY_US_DATE,
+    KEY_EU_DATE,
     KEY_QUICK_START,
     KEY_LEADING_ZERO,
     KEY_BACKGROUND_COLOR,
@@ -33,13 +34,15 @@ enum {
     KEY_NUMBER_VARIATION,
     KEY_ORNAMENT_BASE_COLOR,
     KEY_ORNAMENT_VARIATION,
+    KEY_INVERT,
 };
 
 #define PREFERENCES_KEY 0
 
-#define US_DATE (curPrefs.us_date) // true == MM/DD, false == DD/MM
+#define US_DATE (!curPrefs.eu_date) // true == MM/DD, false == DD/MM
 #define NO_ZERO (!curPrefs.leading_zero) // true == replaces leading Zero for hour, day, month with a "cycler"
-#define TILE_SIZE (curPrefs.large_mode ? 12 : 10)
+#define TILE_SIZE PBL_IF_RECT_ELSE((curPrefs.large_mode ? 12 : 10), 10)
+#define INVERT (curPrefs.invert)
 #define NUMSLOTS PBL_IF_RECT_ELSE(8, 18)
 #define SPACING_X TILE_SIZE
 #define SPACING_Y (curPrefs.large_mode ? TILE_SIZE - 1 : TILE_SIZE)
@@ -51,7 +54,7 @@ enum {
 #define NUMBER_ADD_VARIATION      (curPrefs.number_variation)
 #define ORNAMENT_ADD_VARIATION    (curPrefs.ornament_variation)
   
-#define BACKGROUND_COLOR    ((GColor8) { .argb = curPrefs.background_color })
+#define BACKGROUND_COLOR    PBL_IF_BW_ELSE((INVERT ? GColorWhite : GColorBlack), ((GColor8) { .argb = curPrefs.background_color }))
 
 #define FONT blocks
 	
@@ -290,7 +293,11 @@ static GColor8 getSlotColor(int x, int y, int digit, int pos) {
       argb = NUMBER_BASE_COLOR_ARGB8;
       should_add_var = NUMBER_ADD_VARIATION;
     #elif defined(PBL_BW)
-      argb = 0b11111111;
+      if (!INVERT) {
+        argb = 0b11111111;
+      } else {
+        argb = 0b11000000;
+      }
     #endif
   } else {
     #if defined(PBL_COLOR)
@@ -525,7 +532,7 @@ static void teardownUI() {
 static void in_received_handler(DictionaryIterator *iter, void *context) {
   curPrefs = (Preferences) {
       .large_mode =             dict_find(iter, KEY_LARGE_MODE)->value->int8,
-      .us_date =                dict_find(iter, KEY_US_DATE)->value->int8,
+      .eu_date =                dict_find(iter, KEY_EU_DATE)->value->int8,
       .quick_start =            dict_find(iter, KEY_QUICK_START)->value->int8,
       .leading_zero =           dict_find(iter, KEY_LEADING_ZERO)->value->int8,
       .background_color =       dict_find(iter, KEY_BACKGROUND_COLOR)->value->int32,
@@ -533,6 +540,7 @@ static void in_received_handler(DictionaryIterator *iter, void *context) {
       .number_variation =       dict_find(iter, KEY_NUMBER_VARIATION)->value->int8,
       .ornament_base_color =    dict_find(iter, KEY_ORNAMENT_BASE_COLOR)->value->int32,
       .ornament_variation =     dict_find(iter, KEY_ORNAMENT_VARIATION)->value->int8,
+      .invert =                 dict_find(iter, KEY_INVERT)->value->int8,
   };
   persist_write_data(PREFERENCES_KEY, &curPrefs, sizeof(curPrefs));
   APP_LOG(APP_LOG_LEVEL_INFO, "Tearing down");
@@ -555,7 +563,7 @@ static void init() {
   } else {
     curPrefs = (Preferences) {
       .large_mode = false,
-      .us_date = true,
+      .eu_date = true,
       .quick_start = false,
       .leading_zero = false,
       .background_color = 0b11000000,
@@ -563,6 +571,7 @@ static void init() {
       .number_variation = true,
       .ornament_base_color = 0b11100010,
       .ornament_variation = true,
+      .invert = false,
     };
   }