diff --git a/lib/core/controllers/colored_text_editing_controller.dart b/lib/core/controllers/colored_text_editing_controller.dart
index f499d50..ff62ea2 100644
--- a/lib/core/controllers/colored_text_editing_controller.dart
+++ b/lib/core/controllers/colored_text_editing_controller.dart
@@ -53,6 +53,12 @@ class ColoredTextEditingController extends TextEditingController {
     );
   }
 
+  @override
+  void dispose() {
+    languageCheckService.dispose();
+    super.dispose();
+  }
+
   /// Replaces mistake with given replacement
   void replaceMistake(Mistake mistake, String replacement) {
     text = text.replaceRange(mistake.offset, mistake.endOffset, replacement);
diff --git a/lib/domain/language_check_service.dart b/lib/domain/language_check_service.dart
index 16843d9..5632f1b 100644
--- a/lib/domain/language_check_service.dart
+++ b/lib/domain/language_check_service.dart
@@ -7,4 +7,10 @@ abstract class LanguageCheckService {
 
   /// Returns found mistakes in the given [text].
   Future<List<Mistake>> findMistakes(String text);
+
+  /// Disposes resources of this [LanguageCheckService].
+  Future<void> dispose() async {
+    // does nothing by default, but implementations may need to use it
+    return;
+  }
 }
diff --git a/lib/implementations/debounce_lang_tool_service.dart b/lib/implementations/debounce_lang_tool_service.dart
index 7aabc2d..b637844 100644
--- a/lib/implementations/debounce_lang_tool_service.dart
+++ b/lib/implementations/debounce_lang_tool_service.dart
@@ -24,4 +24,10 @@ class DebounceLangToolService extends LanguageCheckService {
 
     return value ?? [];
   }
+
+  @override
+  Future<void> dispose() async {
+    await debouncing.close();
+    await baseService.dispose();
+  }
 }
diff --git a/lib/implementations/throttling_lang_tool_service.dart b/lib/implementations/throttling_lang_tool_service.dart
index 139358c..9563587 100644
--- a/lib/implementations/throttling_lang_tool_service.dart
+++ b/lib/implementations/throttling_lang_tool_service.dart
@@ -21,4 +21,10 @@ class ThrottlingLangToolService extends LanguageCheckService {
   Future<List<Mistake>> findMistakes(String text) =>
       throttling.throttle(() => baseService.findMistakes(text))
           as Future<List<Mistake>>;
+
+  @override
+  Future<void> dispose() async {
+    await throttling.close();
+    await baseService.dispose();
+  }
 }