diff --git a/app.py b/app.py
index 7d6925b..512d903 100644
--- a/app.py
+++ b/app.py
@@ -8,6 +8,7 @@ from urllib.request import urlopen
 from pathlib import Path
 from influxdb_client import InfluxDBClient
 from datetime import datetime, timedelta
+from collections import defaultdict
 
 app = Flask(__name__)
 
@@ -184,14 +185,16 @@ def get_balance_color(balance):
     return "green"
 
 
-def get_balance_history(days=30):
+def get_balance_comparison():
+
     if not all([
         INFLUX_URL,
         INFLUX_ORG,
         INFLUX_BUCKET,
         INFLUX_TOKEN
     ]):
-        return []
+        return {}
+
     client = InfluxDBClient(
         url=INFLUX_URL,
         token=INFLUX_TOKEN,
@@ -200,24 +203,103 @@ def get_balance_history(days=30):
 
     query = f'''
     from(bucket: "{INFLUX_BUCKET}")
-      |> range(start: -{days}d)
+      |> range(start: -180d)
       |> filter(fn: (r) => r._measurement == "Kontostand")
       |> filter(fn: (r) => r._field == "value")
     '''
 
     result = client.query_api().query(query)
 
-    history = []
+    raw_data = []
 
     for table in result:
         for record in table.records:
 
-            history.append({
-                "date": record.get_time().strftime("%d.%m"),
+            raw_data.append({
+                "time": record.get_time(),
                 "value": round(record.get_value(), 2)
             })
 
-    return history
+    raw_data.sort(
+        key=lambda x: x["time"]
+    )
+
+    periods = defaultdict(dict)
+
+    for item in raw_data:
+
+        dt = item["time"]
+
+        if dt.day >= 15:
+
+            period_start = datetime(
+                dt.year,
+                dt.month,
+                15
+            )
+
+        else:
+
+            if dt.month == 1:
+
+                period_start = datetime(
+                    dt.year - 1,
+                    12,
+                    15
+                )
+
+            else:
+
+                period_start = datetime(
+                    dt.year,
+                    dt.month - 1,
+                    15
+                )
+
+        day_index = (
+            dt.date() -
+            period_start.date()
+        ).days + 1
+
+        periods[period_start][day_index] = item["value"]
+
+    sorted_periods = sorted(
+        periods.keys(),
+        reverse=True
+    )
+
+    result_data = {}
+
+    names = [
+        "current",
+        "period_1",
+        "period_2",
+        "period_3",
+        "period_4"
+    ]
+
+    for idx, period in enumerate(sorted_periods[:5]):
+
+        data = []
+
+        days = periods[period]
+
+        last_value = None
+
+        for day in range(1, 32):
+
+            if day in days:
+                last_value = days[day]
+
+            if last_value is not None:
+                data.append({
+                    "day": day,
+                    "value": last_value
+                })
+
+        result_data[names[idx]] = data
+
+    return result_data
 @app.route("/")
 def index():
 
@@ -238,8 +320,8 @@ def index():
         balance
     )
 
-    balance_history = get_balance_history()
-
+    balance_history = get_balance_comparison()
+    print(balance_history)
     return render_template(
         "index.html",
         year=year,
diff --git a/static/style.css b/static/style.css
index f654179..10849ac 100644
--- a/static/style.css
+++ b/static/style.css
@@ -383,4 +383,10 @@ text-decoration: underline;
     line-height: 1.6;
 
     margin-bottom: 20px;
+}
+.chart-card {
+
+    grid-column: 1 / -1;
+
+    min-height: 550px;
 }
\ No newline at end of file
diff --git a/templates/index.html b/templates/index.html
index dfcc47d..3b08b44 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -114,10 +114,10 @@
         </p>
 
     </div>
-<div class="card">
+<div class="card chart-card">
 
     <h2>
-        Kontostand letzte 30 Tage
+        Kontostandvergleich
     </h2>
 
     <canvas id="balanceChart"></canvas>
@@ -257,8 +257,25 @@ Hintergasse © 2026
 
 const history = {{ balance_history|tojson }};
 
-const labels = history.map(item => item.date);
-const values = history.map(item => item.value);
+const labels = Array.from(
+    {length: 31},
+    (_, i) => i + 1
+);
+
+function getSeries(periodName) {
+
+    const values = new Array(31).fill(null);
+
+    if (!history[periodName]) {
+        return values;
+    }
+
+    history[periodName].forEach(item => {
+        values[item.day - 1] = item.value;
+    });
+
+    return values;
+}
 
 new Chart(
     document.getElementById("balanceChart"),
@@ -266,35 +283,79 @@ new Chart(
         type: "line",
 
         data: {
+
             labels: labels,
 
-            datasets: [{
-                label: "Kontostand (€)",
-                data: values,
-                tension: 0.3
-            }]
+            datasets: [
+
+                {
+                    label: "Aktuell",
+                    data: getSeries("current"),
+                    tension: 0.3,
+                    borderWidth: 4
+                },
+
+                {
+                    label: "-1 Monat",
+                    data: getSeries("period_1"),
+                    tension: 0.3
+                },
+
+                {
+                    label: "-2 Monate",
+                    data: getSeries("period_2"),
+                    tension: 0.3
+                },
+
+                {
+                    label: "-3 Monate",
+                    data: getSeries("period_3"),
+                    tension: 0.3
+                },
+
+                {
+                    label: "-4 Monate",
+                    data: getSeries("period_4"),
+                    tension: 0.3
+                }
+
+            ]
         },
 
         options: {
+
             responsive: true,
 
+            interaction: {
+                mode: "index",
+                intersect: false
+            },
+
             plugins: {
                 legend: {
-                    display: false
+                    display: true
                 }
             },
 
             scales: {
+
+                x: {
+                    title: {
+                        display: true,
+                        text: "Tag seit dem 15."
+                    }
+                },
+
                 y: {
-                    beginAtZero: false
+                    beginAtZero: false,
+                    title: {
+                        display: true,
+                        text: "Kontostand (€)"
+                    }
                 }
             }
         }
     }
 );
 
-</script>
-
-</body>
-
-</html>
+</script>
\ No newline at end of file