diff --git a/df_designer/main.py b/df_designer/main.py
index fb7f45e5..f95a186e 100644
--- a/df_designer/main.py
+++ b/df_designer/main.py
@@ -1,3 +1,5 @@
+from pathlib import Path
+import aiofiles
 import dff
 from fastapi import FastAPI, Request
 from fastapi.responses import HTMLResponse
@@ -16,8 +18,13 @@
 
 @app.get("/")
 async def main_page() -> HTMLResponse:
-    """Main."""
-    html = "main page"
+    """Return frontend."""
+    start_page = "static/index.html"
+    if not Path(start_page).exists():
+        html = "frontend is not build"
+    else:
+        async with aiofiles.open(start_page) as file:
+            html = await file.read()
     return HTMLResponse(content=html, status_code=200)
 
 
@@ -117,6 +124,7 @@ async def library_llms_get() -> dict[str, str]:
     """(get available llm models) - JSON of llm models"""
     return {"status": "ok"}
 
+
 # TODO: rename runtime (здесь нет DFF, здесь используются модели)
 # /dff
 @app.post("/dff/tests/prompt")
diff --git a/tests/test_main.py b/tests/test_main.py
index 7f37c8fb..21774172 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -23,6 +23,7 @@ def test_main_save():
     response = client.post("/save", json={"key": "value"})
     assert response.status_code == 200
     assert response.json() == {"status": "ok"}
+    Path(settings.path_to_save).unlink()
 
 
 def test_main_get():