diff --git a/app/app.py b/app/app.py
new file mode 100644
index 0000000..f0585b9
--- /dev/null
+++ b/app/app.py
@@ -0,0 +1,206 @@
+import os
+import random
+import time
+import re
+import psycopg2
+from flask import Flask, render_template, request, jsonify
+from difflib import SequenceMatcher
+
+app = Flask(__name__)
+
+def get_db_connection():
+    max_retries = 10
+    for i in range(max_retries):
+        try:
+            conn = psycopg2.connect(
+                host=os.environ.get('DB_HOST', 'postgres-lat'),
+                database=os.environ.get('DB_NAME', 'latein'),
+                user=os.environ.get('DB_USER', 'latein'),
+                password=os.environ.get('DB_PASS', 'latein')
+            )
+            return conn
+        except psycopg2.OperationalError:
+            time.sleep(2)
+            continue
+    raise Exception("DB Connection failed")
+
+def init_db():
+    conn = get_db_connection()
+    cur = conn.cursor()
+    if os.path.exists('init.sql'):
+        with open('init.sql', 'r', encoding='utf-8') as f:
+            cur.execute(f.read())
+            conn.commit()
+    cur.close()
+    conn.close()
+
+# Start-Initialisierung
+init_db()
+
+# --- HELPER FUNKTIONEN ---
+
+def is_middle_relevant(text):
+    if not text: return False
+    signals = [' m', ' f', ' n', 'm.', 'f.', 'n.', 'pl', 'sg', 'gen', 'dat', 'akk', 'abl', 'perf', 'ppp']
+    t = text.lower()
+    ignore = ['adv', 'präp', 'konj', 'subj', 'interj']
+    is_signal = any(s in t for s in signals)
+    is_ignore = any(i in t for i in ignore)
+    if is_ignore and not is_signal: return False
+    return True
+
+def clean_german_answers(text):
+    text = re.sub(r'\(.*?\)', '', text)
+    text = re.sub(r'\[.*?\]', '', text)
+    parts = re.split(r'[;,]', text)
+    return [p.strip() for p in parts if p.strip()]
+
+def check_middle_logic(user_in, correct):
+    """Prüft auf Unvollständigkeit (Komma-Trennung)"""
+    u = user_in.strip().lower()
+    c = correct.strip().lower()
+    
+    if u == c: return 'correct'
+    
+    def get_parts(s): return [x.strip() for x in s.split(',') if x.strip()]
+    
+    u_parts = get_parts(u)
+    c_parts = get_parts(c)
+    
+    if not u_parts: return 'wrong'
+    
+    all_user_parts_correct = all(p in c_parts for p in u_parts)
+    
+    if all_user_parts_correct:
+        if len(u_parts) < len(c_parts):
+            return 'incomplete'
+        return 'correct'
+        
+    ratio = SequenceMatcher(None, u, c).ratio()
+    if ratio > 0.85: return 'typo'
+    
+    return 'wrong'
+
+def check_string_match(user_in, correct):
+    u = user_in.strip().lower()
+    c = correct.strip().lower()
+    if u == c: return 'correct'
+    ratio = SequenceMatcher(None, u, c).ratio()
+    if ratio > 0.85: return 'typo'
+    return 'wrong'
+
+# --- ROUTEN ---
+
+@app.route('/')
+def index():
+    return render_template('index.html')
+
+@app.route('/api/lessons')
+def get_lessons():
+    conn = get_db_connection()
+    cur = conn.cursor()
+    cur.execute("SELECT DISTINCT lesson FROM vocabulary")
+    rows = cur.fetchall()
+    cur.close()
+    conn.close()
+    
+    lessons = [r[0] for r in rows]
+    
+    # Sortierung: Erst Zahlen, dann Strings, "Original" ganz hinten
+    def sort_key(val):
+        if val.isdigit(): return (0, int(val))
+        if val.startswith("Original"): return (2, val)
+        return (1, val)
+        
+    lessons.sort(key=sort_key)
+    return jsonify(lessons)
+
+@app.route('/api/question', methods=['POST'])
+def get_question():
+    data = request.json
+    selected_lessons = data.get('lessons', [])
+    ask_middle_setting = data.get('askMiddle', True)
+    
+    conn = get_db_connection()
+    cur = conn.cursor()
+    query = "SELECT id, lesson, latin, middle, german FROM vocabulary WHERE lesson = ANY(%s) ORDER BY RANDOM() LIMIT 1"
+    cur.execute(query, (selected_lessons,))
+    row = cur.fetchone()
+    cur.close()
+    conn.close()
+    
+    if not row: return jsonify({'error': 'Keine Vokabeln gefunden'})
+        
+    vid, lesson, latin, middle, german_raw = row
+    german_answers = clean_german_answers(german_raw)
+    
+    middle_req = False
+    hint = ""
+    if middle:
+        if ask_middle_setting and is_middle_relevant(middle):
+            middle_req = True
+        else:
+            hint = middle 
+
+    return jsonify({
+        'id': vid,
+        'latin': latin,
+        'hint': hint,
+        'middle_req': middle_req,
+        'middle_correct': middle if middle_req else "",
+        'german_count': len(german_answers),
+        'german_correct': german_answers
+    })
+
+@app.route('/api/check', methods=['POST'])
+def check():
+    data = request.json
+    inputs = data.get('inputs', []) 
+    attempt_num = data.get('attempt', 1)
+    
+    results = []
+    total_items = len(inputs)
+    correct_items = 0
+    has_incomplete = False
+    
+    for inp in inputs:
+        user_val = inp.get('value', '')
+        correct_val = inp.get('correct', '')
+        field_type = inp.get('type', 'german') 
+        
+        status = 'wrong'
+        
+        if field_type == 'middle':
+            status = check_middle_logic(user_val, correct_val)
+        else:
+            status = check_string_match(user_val, correct_val)
+            
+        res_entry = {'status': status, 'correct': correct_val}
+        
+        if status == 'incomplete':
+            res_entry['msg'] = 'Unvollständig! Da fehlt noch etwas.'
+            has_incomplete = True
+        
+        results.append(res_entry)
+        
+        if status in ['correct', 'typo']: 
+            correct_items += 1
+            
+    score_fraction = 0
+    if total_items > 0:
+        base_score = correct_items / total_items
+        if attempt_num > 1:
+            base_score = base_score * 0.5
+        score_fraction = base_score
+
+    all_correct = (correct_items == total_items)
+
+    return jsonify({
+        'results': results,
+        'all_correct': all_correct,
+        'score': score_fraction,
+        'has_incomplete': has_incomplete
+    })
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=5000)
\ No newline at end of file