diff --git a/mediapipe/tasks/ios/BUILD b/mediapipe/tasks/ios/BUILD
index 009431eb1a..127e9a6569 100644
--- a/mediapipe/tasks/ios/BUILD
+++ b/mediapipe/tasks/ios/BUILD
@@ -83,6 +83,9 @@ strip_api_include_path_prefix(
         "//mediapipe/tasks/ios/text/text_embedder:sources/MPPTextEmbedder.h",
         "//mediapipe/tasks/ios/text/text_embedder:sources/MPPTextEmbedderOptions.h",
         "//mediapipe/tasks/ios/text/text_embedder:sources/MPPTextEmbedderResult.h",
+        "//mediapipe/tasks/ios/text/language_detector:sources/MPPLanguageDetector.h",
+        "//mediapipe/tasks/ios/text/language_detector:sources/MPPLanguageDetectorOptions.h",
+        "//mediapipe/tasks/ios/text/language_detector:sources/MPPLanguageDetectorResult.h",
         "//mediapipe/tasks/ios/vision/core:sources/MPPRunningMode.h",
         "//mediapipe/tasks/ios/vision/core:sources/MPPImage.h",
         "//mediapipe/tasks/ios/vision/core:sources/MPPMask.h",
@@ -147,8 +150,12 @@ apple_static_xcframework(
         ":MPPTextEmbedder.h",
         ":MPPTextEmbedderOptions.h",
         ":MPPTextEmbedderResult.h",
+        ":MPPLanguageDetector.h",
+        ":MPPLanguageDetectorOptions.h",
+        ":MPPLanguageDetectorResult.h",
     ],
     deps = [
+        "//mediapipe/tasks/ios/text/language_detector:MPPLanguageDetector",
         "//mediapipe/tasks/ios/text/text_classifier:MPPTextClassifier",
         "//mediapipe/tasks/ios/text/text_embedder:MPPTextEmbedder",
     ],
diff --git a/mediapipe/tasks/ios/test/text/language_detector/MPPLanguageDetectorTests.mm b/mediapipe/tasks/ios/test/text/language_detector/MPPLanguageDetectorTests.mm
index 28d2ea5c03..1b738a124e 100644
--- a/mediapipe/tasks/ios/test/text/language_detector/MPPLanguageDetectorTests.mm
+++ b/mediapipe/tasks/ios/test/text/language_detector/MPPLanguageDetectorTests.mm
@@ -116,6 +116,82 @@ - (void)testClassifyWithL2CModelSucceeds {
   [self assertResultsOfDetectLanguageOfText:ruText
                                usingLanguageDetector:languageDetector
       approximatelyEqualsExpectedLanguagePredictions:expectedRuLanguagePredictions];
+
+  NSString *zhText = @"分久必合合久必分";
+  NSArray<MPPLanguagePrediction *> *expectedZhLanguagePredictions = @[
+    [[MPPLanguagePrediction alloc] initWithLanguageCode:@"zh" probability:0.505424f],
+    [[MPPLanguagePrediction alloc] initWithLanguageCode:@"ja" probability:0.481617f]
+  ];
+
+  [self assertResultsOfDetectLanguageOfText:zhText
+                               usingLanguageDetector:languageDetector
+      approximatelyEqualsExpectedLanguagePredictions:expectedZhLanguagePredictions];
+}
+
+- (void)testClassifyWithMaxResultsSucceeds {
+  MPPLanguageDetectorOptions *options =
+      [self languageDetectorOptionsWithModelFileInfo:kLanguageDetectorModelFileInfo];
+  options.maxResults = 1;
+  MPPLanguageDetector *languageDetector = [self createLanguageDetectorWithOptionsSucceeds:options];
+
+  NSString *zhText = @"分久必合合久必分";
+  NSArray<MPPLanguagePrediction *> *expectedZhLanguagePredictions = @[
+    [[MPPLanguagePrediction alloc] initWithLanguageCode:@"zh" probability:0.505424f],
+  ];
+
+  [self assertResultsOfDetectLanguageOfText:zhText
+                               usingLanguageDetector:languageDetector
+      approximatelyEqualsExpectedLanguagePredictions:expectedZhLanguagePredictions];
+}
+
+- (void)testClassifyWithScoreThresholdSucceeds {
+  MPPLanguageDetectorOptions *options =
+      [self languageDetectorOptionsWithModelFileInfo:kLanguageDetectorModelFileInfo];
+  options.scoreThreshold = 0.5f;
+  MPPLanguageDetector *languageDetector = [self createLanguageDetectorWithOptionsSucceeds:options];
+
+  NSString *zhText = @"分久必合合久必分";
+  NSArray<MPPLanguagePrediction *> *expectedZhLanguagePredictions = @[
+    [[MPPLanguagePrediction alloc] initWithLanguageCode:@"zh" probability:0.505424f],
+  ];
+
+  [self assertResultsOfDetectLanguageOfText:zhText
+                               usingLanguageDetector:languageDetector
+      approximatelyEqualsExpectedLanguagePredictions:expectedZhLanguagePredictions];
+}
+
+- (void)testClassifyWithCategoryAllowListSucceeds {
+  MPPLanguageDetectorOptions *options =
+      [self languageDetectorOptionsWithModelFileInfo:kLanguageDetectorModelFileInfo];
+  options.categoryAllowlist = @[ @"zh" ];
+
+  MPPLanguageDetector *languageDetector = [self createLanguageDetectorWithOptionsSucceeds:options];
+
+  NSString *zhText = @"分久必合合久必分";
+  NSArray<MPPLanguagePrediction *> *expectedZhLanguagePredictions = @[
+    [[MPPLanguagePrediction alloc] initWithLanguageCode:@"zh" probability:0.505424f],
+  ];
+
+  [self assertResultsOfDetectLanguageOfText:zhText
+                               usingLanguageDetector:languageDetector
+      approximatelyEqualsExpectedLanguagePredictions:expectedZhLanguagePredictions];
+}
+
+- (void)testClassifyWithCategoryDenyListSucceeds {
+  MPPLanguageDetectorOptions *options =
+      [self languageDetectorOptionsWithModelFileInfo:kLanguageDetectorModelFileInfo];
+  options.categoryDenylist = @[ @"zh" ];
+
+  MPPLanguageDetector *languageDetector = [self createLanguageDetectorWithOptionsSucceeds:options];
+
+  NSString *zhText = @"分久必合合久必分";
+  NSArray<MPPLanguagePrediction *> *expectedZhLanguagePredictions = @[
+    [[MPPLanguagePrediction alloc] initWithLanguageCode:@"ja" probability:0.481617f],
+  ];
+
+  [self assertResultsOfDetectLanguageOfText:zhText
+                               usingLanguageDetector:languageDetector
+      approximatelyEqualsExpectedLanguagePredictions:expectedZhLanguagePredictions];
 }
 
 #pragma mark Assert Segmenter Results
@@ -125,6 +201,8 @@ - (void)assertResultsOfDetectLanguageOfText:(NSString *)text
         (NSArray<MPPLanguagePrediction *> *)expectedLanguagePredictions {
   MPPLanguageDetectorResult *result = [languageDetector detectText:text error:nil];
   XCTAssertNotNil(result);
+
+  XCTAssertEqual(result.languagePredictions.count, expectedLanguagePredictions.count);
   XCTAssertEqualWithAccuracy(result.languagePredictions[0].probability,
                              expectedLanguagePredictions[0].probability, 1e-3);
   XCTAssertEqualObjects(result.languagePredictions[0].languageCode,
diff --git a/mediapipe/tasks/ios/text/language_detector/sources/MPPLanguageDetectorOptions.m b/mediapipe/tasks/ios/text/language_detector/sources/MPPLanguageDetectorOptions.m
index df36493ef0..9113a9a47b 100644
--- a/mediapipe/tasks/ios/text/language_detector/sources/MPPLanguageDetectorOptions.m
+++ b/mediapipe/tasks/ios/text/language_detector/sources/MPPLanguageDetectorOptions.m
@@ -20,7 +20,7 @@ - (instancetype)init {
   self = [super init];
   if (self) {
     _maxResults = -1;
-    _scoreThreshold = 0;
+    _scoreThreshold = -1.0f;
   }
   return self;
 }
diff --git a/mediapipe/tasks/ios/text/language_detector/utils/sources/MPPLanguageDetectorOptions+Helpers.mm b/mediapipe/tasks/ios/text/language_detector/utils/sources/MPPLanguageDetectorOptions+Helpers.mm
index 9d75105b4f..0f1db0484c 100644
--- a/mediapipe/tasks/ios/text/language_detector/utils/sources/MPPLanguageDetectorOptions+Helpers.mm
+++ b/mediapipe/tasks/ios/text/language_detector/utils/sources/MPPLanguageDetectorOptions+Helpers.mm
@@ -42,7 +42,10 @@ - (void)copyToProto:(CalculatorOptionsProto *)optionsProto {
   }
 
   classifierOptionsProto->set_max_results((int)self.maxResults);
-  classifierOptionsProto->set_score_threshold(self.scoreThreshold);
+
+  if (self.scoreThreshold >= 0) {
+    classifierOptionsProto->set_score_threshold(self.scoreThreshold);
+  }
 
   for (NSString *category in self.categoryAllowlist) {
     classifierOptionsProto->add_category_allowlist(category.cppString);