diff --git a/syncplay/client.py b/syncplay/client.py
index bd84a42..f7618dd 100644
--- a/syncplay/client.py
+++ b/syncplay/client.py
@@ -6,7 +6,7 @@ from twisted.internet.protocol import ClientFactory
 from twisted.internet import reactor, task
 from syncplay.protocols import SyncClientProtocol
 from syncplay import utils, constants
-from syncplay.messages import getMessage
+from syncplay.messages import getMessage, getMissingStrings
 import threading
 from syncplay.constants import PRIVACY_SENDHASHED_MODE, PRIVACY_DONTSEND_MODE, \
     PRIVACY_HIDDENFILENAME, FILENAME_STRIP_REGEX
@@ -102,6 +102,11 @@ class SyncplayClient(object):
         if constants.LIST_RELATIVE_CONFIGS and self._config.has_key('loadedRelativePaths') and self._config['loadedRelativePaths']:
             self.ui.showMessage(getMessage("relative-config-notification").format("; ".join(self._config['loadedRelativePaths'])), noPlayer=True, noTimestamp=True)
 
+        if constants.DEBUG_MODE and constants.WARN_ABOUT_MISSING_STRINGS:
+            missingStrings = getMissingStrings()
+            if missingStrings is not None and missingStrings is not "":
+                self.ui.showDebugMessage("MISSING STRINGS DETECTED:\n{}".format(missingStrings))
+
     def initProtocol(self, protocol):
         self._protocol = protocol
 
diff --git a/syncplay/constants.py b/syncplay/constants.py
index 4cd8f3d..59a5adb 100644
--- a/syncplay/constants.py
+++ b/syncplay/constants.py
@@ -14,6 +14,7 @@ LIST_RELATIVE_CONFIGS = True  # Print list of relative configs loaded
 SHOW_CONTACT_INFO = True  # Displays dev contact details below list in GUI
 SHOW_BUTTON_LABELS = True  # If disabled, only shows icons for main GUI buttons
 SHOW_TOOLTIPS = True
+WARN_ABOUT_MISSING_STRINGS = False # (If debug mode is enabled)
 
 #Overriden by config
 SHOW_OSD = True  # Sends Syncplay messages to media player OSD
diff --git a/syncplay/messages.py b/syncplay/messages.py
index a190893..09e310c 100755
--- a/syncplay/messages.py
+++ b/syncplay/messages.py
@@ -783,6 +783,15 @@ messages = {
 def setLanguage(lang):
     messages["current"] = lang
 
+def getMissingStrings():
+    missingStrings = ""
+    for lang in messages:
+        if lang != "en" and lang != "current":
+            for message in messages["en"]:
+                if not messages[lang].has_key(message):
+                    missingStrings = missingStrings + "({}) Missing: {}\n".format(lang, message)
+    return missingStrings
+
 def getMessage(type_, locale=None):
     if constants.SHOW_BUTTON_LABELS == False:
         if "-guibuttonlabel" in type_: