diff --git a/.env.example b/.env.example
index de0f388..3805e7a 100644
--- a/.env.example
+++ b/.env.example
@@ -1 +1,2 @@
 VITE_API_DOMAIN=http://localhost:3000
+VITE_MOCK_MODE=false
diff --git a/package.json b/package.json
index f8d2074..166f157 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
   "type": "module",
   "scripts": {
     "dev": "vite",
+    "dev:mock": "VITE_MOCK_MODE=true vite",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
     "preview": "vite preview"
diff --git a/src/api/client.ts b/src/api/client.ts
index 6acd721..9a9a763 100644
--- a/src/api/client.ts
+++ b/src/api/client.ts
@@ -1,6 +1,7 @@
 import axios from 'axios';
 import { useStore } from '../store/useStore';
 import type { Profile, ApiResponse } from '../types/api';
+import { mockApi } from './mock';
 
 const getClient = () => {
   const { apiDomain, apiKey } = useStore.getState();
@@ -14,11 +15,17 @@ const getClient = () => {
 
 export const api = {
   getProfile: async () => {
+    if (useStore.getState().isMockMode) {
+      return mockApi.getProfile();
+    }
     const client = getClient();
     const response = await client.get<ApiResponse<Profile>>('/v1/profile');
     return response.data.data;
   },
   checkHealth: async () => {
+    if (useStore.getState().isMockMode) {
+      return mockApi.checkHealth();
+    }
     const client = getClient();
     const response = await client.get('/v1/health');
     return response.data;
diff --git a/src/api/mock.ts b/src/api/mock.ts
new file mode 100644
index 0000000..637da4e
--- /dev/null
+++ b/src/api/mock.ts
@@ -0,0 +1,26 @@
+import type { Profile } from '../types/api';
+
+export const mockProfile: Profile = {
+  fullName: 'Иванов Иван Иванович',
+  group: 'ИКПИ-11',
+  faculty: 'Инфокоммуникационных сетей и систем',
+  studentId: '2210000',
+  email: 'ivanov.ii@example.com',
+  raw: {
+    'Дата рождения': '01.01.2004',
+    'Статус': 'Студент',
+  },
+};
+
+export const mockApi = {
+  getProfile: async (): Promise<Profile> => {
+    return new Promise((resolve) => {
+      setTimeout(() => resolve(mockProfile), 500);
+    });
+  },
+  checkHealth: async (): Promise<any> => {
+    return new Promise((resolve) => {
+      setTimeout(() => resolve({ status: 'ok', mock: true }), 300);
+    });
+  },
+};
diff --git a/src/pages/Login.tsx b/src/pages/Login.tsx
index 5867265..b353229 100644
--- a/src/pages/Login.tsx
+++ b/src/pages/Login.tsx
@@ -4,7 +4,7 @@ import { useNavigate } from 'react-router-dom';
 import { api } from '../api/client';
 
 export const Login: React.FC = () => {
-  const { apiDomain, apiKey, setApiDomain, setApiKey } = useStore();
+  const { apiDomain, apiKey, isMockMode, setApiDomain, setApiKey, setMockMode } = useStore();
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState('');
   const navigate = useNavigate();
@@ -16,10 +16,14 @@ export const Login: React.FC = () => {
 
     try {
       // Basic validation
-      if (!apiDomain || !apiKey) {
+      if (!isMockMode && (!apiDomain || !apiKey)) {
         throw new Error('Please fill all fields');
       }
 
+      if (isMockMode && !apiKey) {
+        setApiKey('mock-session');
+      }
+
       // Check health
       await api.checkHealth();
       
@@ -44,6 +48,7 @@ export const Login: React.FC = () => {
           placeholder="API Domain (e.g. https://api.example.com)"
           value={apiDomain}
           onChange={(e) => setApiDomain(e.target.value)}
+          disabled={isMockMode}
         />
         <input
           type="password"
@@ -51,7 +56,22 @@ export const Login: React.FC = () => {
           placeholder="API Key"
           value={apiKey}
           onChange={(e) => setApiKey(e.target.value)}
+          disabled={isMockMode}
         />
+        
+        <div style={{ marginBottom: '16px', display: 'flex', alignItems: 'center' }}>
+          <input
+            type="checkbox"
+            id="mockMode"
+            checked={isMockMode}
+            onChange={(e) => setMockMode(e.target.checked)}
+            style={{ marginRight: '8px' }}
+          />
+          <label htmlFor="mockMode" style={{ fontSize: '14px', cursor: 'pointer' }}>
+            Enable Mock Mode (UI Only)
+          </label>
+        </div>
+
         {error && (
           <p style={{ color: 'var(--md-sys-color-error)', marginBottom: '16px' }}>
             {error}
diff --git a/src/store/useStore.ts b/src/store/useStore.ts
index c79a52d..2ec3a38 100644
--- a/src/store/useStore.ts
+++ b/src/store/useStore.ts
@@ -4,8 +4,10 @@ import { persist } from 'zustand/middleware';
 interface AppState {
   apiDomain: string;
   apiKey: string;
+  isMockMode: boolean;
   setApiDomain: (domain: string) => void;
   setApiKey: (key: string) => void;
+  setMockMode: (isMock: boolean) => void;
   reset: () => void;
 }
 
@@ -14,8 +16,10 @@ export const useStore = create<AppState>()(
     (set) => ({
       apiDomain: import.meta.env.VITE_API_DOMAIN || '',
       apiKey: '',
+      isMockMode: import.meta.env.VITE_MOCK_MODE === 'true',
       setApiDomain: (apiDomain) => set({ apiDomain }),
       setApiKey: (apiKey) => set({ apiKey }),
+      setMockMode: (isMockMode) => set({ isMockMode }),
       reset: () => set({ apiKey: '' }),
     }),
     {