diff --git a/docs/conf.py b/docs/conf.py
index 9e754a8..f5862a5 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -29,8 +29,8 @@ html_static_path = ["_static"]
 
 html_context = {
     "languages": [
-        ("English", "/en/latest/%s/", "en"),
-        ("Русский", "/ru/latest/%s/", "ru"),
+        ("English", "/en/latest/%s.html", "en"),
+        ("Русский", "/ru/latest/%s.html", "ru"),
     ]
 }
 
diff --git a/src/argenta/app/models.py b/src/argenta/app/models.py
index 9b0d31b..32c02ce 100644
--- a/src/argenta/app/models.py
+++ b/src/argenta/app/models.py
@@ -23,6 +23,7 @@ from argenta.command.exceptions import (
     RepeatedInputFlagsException,
     UnprocessedInputFlagException,
 )
+from argenta.router.exceptions import RepeatedAliasNameException, RepeatedTriggerNameException
 from argenta.command.models import Command, InputCommand
 from argenta.response import Response
 from argenta.router import Router
@@ -273,6 +274,28 @@ class BaseApp:
 
         self.system_router.command_register_ignore = self._ignore_command_register
         self.registered_routers.add_registered_router(self.system_router)
+    
+    def _validate_routers_for_collisions(self) -> None:
+        """
+        Private. Validates that there are no trigger/alias collisions between routers
+        :return: None
+        :raises: RepeatedTriggerNameException or RepeatedAliasNameException if collision detected
+        """
+        
+        all_triggers: set[str] = set()
+        all_aliases: set[str] = set()
+        
+        for router_entity in self.registered_routers:
+            trigger_collisions: set[str] = (all_triggers | all_aliases) & router_entity.triggers
+            if trigger_collisions:
+                raise RepeatedTriggerNameException()
+            
+            alias_collisions: set[str] = (all_aliases | all_triggers) & router_entity.aliases
+            if alias_collisions:
+                raise RepeatedAliasNameException(alias_collisions)
+            
+            all_triggers.update(router_entity.triggers)
+            all_aliases.update(router_entity.aliases)
 
     def _most_similar_command(self, unknown_command: str) -> str | None:
         all_commands = list(self._current_matching_triggers_with_routers.keys())
@@ -344,6 +367,7 @@ class BaseApp:
         :return: None
         """
         self._setup_system_router()
+        self._validate_routers_for_collisions()
 
         for router_entity in self.registered_routers:
             router_triggers = router_entity.triggers
diff --git a/src/argenta/router/entity.py b/src/argenta/router/entity.py
index 12edb33..f3f50a0 100644
--- a/src/argenta/router/entity.py
+++ b/src/argenta/router/entity.py
@@ -80,6 +80,9 @@ class Router:
             
         if command_name.lower() in self.triggers:
             raise RepeatedTriggerNameException()
+        
+        if command_name.lower() in self.aliases:
+            raise RepeatedAliasNameException({command_name.lower()})
             
         if overlapping := (self.aliases | self.triggers) & set(map(lambda x: x.lower(), command.aliases)):
             raise RepeatedAliasNameException(overlapping)
diff --git a/src/argenta/router/exceptions.py b/src/argenta/router/exceptions.py
index 772c02b..478dcdc 100644
--- a/src/argenta/router/exceptions.py
+++ b/src/argenta/router/exceptions.py
@@ -1,4 +1,10 @@
-__all__ = ["RepeatedFlagNameException", "RequiredArgumentNotPassedException", "TriggerContainSpacesException"]
+__all__ = [
+    "RepeatedFlagNameException",
+    "RepeatedTriggerNameException",
+    "RepeatedAliasNameException",
+    "RequiredArgumentNotPassedException",
+    "TriggerContainSpacesException",
+]
 
 from typing import override
 
diff --git a/tests/unit_tests/test_app.py b/tests/unit_tests/test_app.py
index e75d89f..7909ce6 100644
--- a/tests/unit_tests/test_app.py
+++ b/tests/unit_tests/test_app.py
@@ -221,6 +221,90 @@ def test_overlapping_aliases_raises_exception() -> None:
             pass
 
 
+def test_app_detects_trigger_collision_between_routers() -> None:
+    from argenta.router.exceptions import RepeatedTriggerNameException
+    
+    app = App()
+    router1 = Router()
+    router2 = Router()
+
+    @router1.command('hello')
+    def handler1(_res: Response) -> None:
+        pass
+
+    @router2.command('hello')
+    def handler2(_res: Response) -> None:
+        pass
+
+    app.include_router(router1)
+    app.include_router(router2)
+
+    with pytest.raises(RepeatedTriggerNameException):
+        app._pre_cycle_setup()
+
+
+def test_app_detects_alias_collision_between_routers() -> None:
+    app = App()
+    router1 = Router()
+    router2 = Router()
+
+    @router1.command(Command('hello', aliases={'hi'}))
+    def handler1(_res: Response) -> None:
+        pass
+
+    @router2.command(Command('world', aliases={'hi'}))
+    def handler2(_res: Response) -> None:
+        pass
+
+    app.include_router(router1)
+    app.include_router(router2)
+
+    with pytest.raises(RepeatedAliasNameException):
+        app._pre_cycle_setup()
+
+
+def test_app_detects_trigger_alias_collision_between_routers() -> None:
+    app = App()
+    router1 = Router()
+    router2 = Router()
+
+    @router1.command('hello')
+    def handler1(_res: Response) -> None:
+        pass
+
+    @router2.command(Command('world', aliases={'hello'}))
+    def handler2(_res: Response) -> None:
+        pass
+
+    app.include_router(router1)
+    app.include_router(router2)
+
+    with pytest.raises(RepeatedAliasNameException):
+        app._pre_cycle_setup()
+
+
+def test_app_detects_collision_case_insensitive() -> None:
+    from argenta.router.exceptions import RepeatedTriggerNameException
+    
+    app = App()
+    router1 = Router()
+    router2 = Router()
+
+    @router1.command('Hello')
+    def handler1(_res: Response) -> None:
+        pass
+
+    @router2.command('hELLo')
+    def handler2(_res: Response) -> None:
+        pass
+
+    app.include_router(router1)
+    app.include_router(router2)
+
+    with pytest.raises(RepeatedTriggerNameException):
+        app._pre_cycle_setup()
+
+
 # ============================================================================
 # Tests for startup messages
 # ============================================================================
diff --git a/tests/unit_tests/test_router.py b/tests/unit_tests/test_router.py
index d6c022a..347338a 100644
--- a/tests/unit_tests/test_router.py
+++ b/tests/unit_tests/test_router.py
@@ -9,8 +9,9 @@ from argenta.command.flag.flags import Flags, InputFlags
 from argenta.command.flag.models import PossibleValues, ValidationStatus
 from argenta.response.entity import Response
 from argenta.router import Router
-from argenta.router.entity import _structuring_input_flags, _validate_func_args  # pyright: ignore[reportPrivateUsage]
+from argenta.router.entity import _structuring_input_flags, _validate_func_args
 from argenta.router.exceptions import (
+    RepeatedAliasNameException,
     RepeatedFlagNameException,
     RepeatedTriggerNameException,
     RequiredArgumentNotPassedException,
@@ -247,3 +248,60 @@ def test_finds_appropriate_handler_executes_handler_with_flags_by_alias(capsys:
     output = capsys.readouterr()
 
     assert "Hello World!" in output.out
+
+
+# ============================================================================
+# Tests for alias and trigger collision detection
+# ============================================================================
+
+
+def test_validate_command_raises_error_for_alias_collision_with_existing_trigger() -> None:
+    router = Router()
+    
+    @router.command('hello')
+    def handler(_res: Response) -> None:
+        pass
+    
+    with pytest.raises(RepeatedAliasNameException):
+        @router.command(Command('world', aliases={'hello'}))
+        def handler2(_res: Response) -> None:
+            pass
+
+
+def test_validate_command_raises_error_for_alias_collision_with_existing_alias() -> None:
+    router = Router()
+    
+    @router.command(Command('hello', aliases={'hi'}))
+    def handler(_res: Response) -> None:
+        pass
+    
+    with pytest.raises(RepeatedAliasNameException):
+        @router.command(Command('world', aliases={'hi'}))
+        def handler2(_res: Response) -> None:
+            pass
+
+
+def test_validate_command_raises_error_for_trigger_collision_with_existing_alias() -> None:
+    router = Router()
+    
+    @router.command(Command('hello', aliases={'hi'}))
+    def handler(_res: Response) -> None:
+        pass
+    
+    with pytest.raises(RepeatedAliasNameException):
+        @router.command('hi')
+        def handler2(_res: Response) -> None:
+            pass
+
+
+def test_validate_command_raises_error_for_alias_collision_case_insensitive() -> None:
+    router = Router()
+    
+    @router.command(Command('hello', aliases={'Hi'}))
+    def handler(_res: Response) -> None:
+        pass
+    
+    with pytest.raises(RepeatedAliasNameException):
+        @router.command(Command('world', aliases={'hI'}))
+        def handler2(_res: Response) -> None:
+            pass