diff --git a/mft/static/app.js b/mft/static/app.js
index 24e2964..ddbda53 100644
--- a/mft/static/app.js
+++ b/mft/static/app.js
@@ -243,3 +243,170 @@ function addExpenseToList(expense) {
     const card = createExpenseCard(expense);
     listContainer.insertAdjacentElement('afterbegin', card);
 }
+
+// Tab switching
+document.querySelectorAll('.tab-button').forEach(button => {
+    button.addEventListener('click', () => {
+        const targetTab = button.dataset.tab;
+
+        // Update button states
+        document.querySelectorAll('.tab-button').forEach(btn => {
+            btn.classList.remove('active');
+        });
+        button.classList.add('active');
+
+        // Update content visibility
+        document.querySelectorAll('.tab-content').forEach(content => {
+            content.classList.remove('active');
+        });
+        document.getElementById(`${targetTab}-tab`).classList.add('active');
+
+        // Load statistics when switching to statistics tab
+        if (targetTab === 'statistics') {
+            loadWeeklyTotals();
+        }
+    });
+});
+
+// Weekly totals functionality
+async function loadWeeklyTotals() {
+    const token = localStorage.getItem(TOKEN_KEY);
+    const container = document.getElementById('weekly-totals');
+
+    try {
+        const response = await fetch('/api/statistics/totals?granularity=weekly', {
+            method: 'GET',
+            headers: {
+                'Authorization': `Bearer ${token}`
+            }
+        });
+
+        if (!response.ok) {
+            throw new Error('Failed to load weekly totals');
+        }
+
+        const weeklyData = await response.json();
+        renderWeeklyTotals(weeklyData);
+    } catch (error) {
+        console.error('Error loading weekly totals:', error);
+        container.innerHTML = '<p class="empty-state">Error loading weekly totals</p>';
+    }
+}
+
+function formatDateRange(fromDate, toDate) {
+    const from = new Date(fromDate);
+    const to = new Date(toDate);
+
+    const options = { month: 'short', day: 'numeric' };
+    const fromStr = from.toLocaleDateString('en-US', options);
+    const toStr = to.toLocaleDateString('en-US', options);
+
+    return `${fromStr} - ${toStr}`;
+}
+
+function renderWeeklyTotals(weeklyData) {
+    const container = document.getElementById('weekly-totals');
+
+    if (weeklyData.length === 0) {
+        container.innerHTML = '<p class="empty-state">No expense data available</p>';
+        return;
+    }
+
+    const table = document.createElement('table');
+    table.className = 'totals-table';
+
+    const tbody = document.createElement('tbody');
+
+    // Reverse to show newest weeks first
+    weeklyData.slice().reverse().forEach(week => {
+        // Main week row
+        const weekRow = document.createElement('tr');
+        weekRow.className = 'week-row';
+        weekRow.dataset.week = week.week;
+
+        const dateCell = document.createElement('td');
+        dateCell.className = 'week-date';
+        dateCell.innerHTML = `<span class="expand-icon">▶</span>${formatDateRange(week.from_date, week.to_date)}`;
+
+        const totalCell = document.createElement('td');
+        totalCell.className = 'week-total';
+        totalCell.textContent = `€${(week.total / 100).toFixed(2)}`;
+
+        weekRow.appendChild(dateCell);
+        weekRow.appendChild(totalCell);
+
+        // Categories row (hidden by default)
+        const categoriesRow = document.createElement('tr');
+        categoriesRow.className = 'categories-row';
+        categoriesRow.dataset.week = week.week;
+
+        const categoriesCell = document.createElement('td');
+        categoriesCell.colSpan = 2;
+
+        const categoriesContent = document.createElement('div');
+        categoriesContent.className = 'categories-content';
+
+        if (week.by_category.length === 0) {
+            categoriesContent.innerHTML = '<p class="empty-state">No expenses this week</p>';
+        } else {
+            week.by_category.forEach(category => {
+                const categoryItem = document.createElement('div');
+                categoryItem.className = 'category-item';
+
+                const nameSpan = document.createElement('span');
+                nameSpan.className = 'category-name';
+                nameSpan.textContent = category.name;
+
+                const amountSpan = document.createElement('span');
+                amountSpan.className = 'category-amount';
+                amountSpan.textContent = `€${(category.total / 100).toFixed(2)}`;
+
+                categoryItem.appendChild(nameSpan);
+                categoryItem.appendChild(amountSpan);
+                categoriesContent.appendChild(categoryItem);
+            });
+        }
+
+        categoriesCell.appendChild(categoriesContent);
+        categoriesRow.appendChild(categoriesCell);
+
+        // Add click handler for expansion
+        weekRow.addEventListener('click', () => {
+            toggleWeekExpansion(week.week);
+        });
+
+        tbody.appendChild(weekRow);
+        tbody.appendChild(categoriesRow);
+    });
+
+    table.appendChild(tbody);
+    container.innerHTML = '';
+    container.appendChild(table);
+}
+
+function toggleWeekExpansion(weekId) {
+    const weekRow = document.querySelector(`.week-row[data-week="${weekId}"]`);
+    const categoriesRow = document.querySelector(`.categories-row[data-week="${weekId}"]`);
+
+    weekRow.classList.toggle('expanded');
+    categoriesRow.classList.toggle('visible');
+}
+
+// Expand/collapse all buttons
+document.getElementById('expand-all-btn').addEventListener('click', () => {
+    document.querySelectorAll('.week-row').forEach(row => {
+        row.classList.add('expanded');
+    });
+    document.querySelectorAll('.categories-row').forEach(row => {
+        row.classList.add('visible');
+    });
+});
+
+document.getElementById('collapse-all-btn').addEventListener('click', () => {
+    document.querySelectorAll('.week-row').forEach(row => {
+        row.classList.remove('expanded');
+    });
+    document.querySelectorAll('.categories-row').forEach(row => {
+        row.classList.remove('visible');
+    });
+});
diff --git a/mft/static/index.html b/mft/static/index.html
index a985ee2..9174bcd 100644
--- a/mft/static/index.html
+++ b/mft/static/index.html
@@ -23,31 +23,50 @@
 
         <div id="app-section" style="display: none;">
             <div class="header-bar">
-                <h2>Add Expense</h2>
+                <h2>Minimal Finance Tracker</h2>
                 <button id="logout-btn">Logout</button>
             </div>
 
-            <form id="expense-form">
-                <div class="form-group">
-                    <label for="category">Category</label>
-                    <select id="category" name="category" required>
-                        <option value="">Loading...</option>
-                    </select>
-                </div>
-                <div class="form-group">
-                    <label for="value">Amount</label>
-                    <input type="number" id="value" name="value" step="0.01" min="0" required>
-                </div>
-                <div class="form-group">
-                    <label for="note">Note</label>
-                    <input type="text" id="note" name="note">
-                </div>
-                <button type="submit">Add Expense</button>
-            </form>
+            <div class="tabs">
+                <button class="tab-button active" data-tab="expenses">Expenses</button>
+                <button class="tab-button" data-tab="statistics">Statistics</button>
+            </div>
 
-            <div id="expense-list-section">
-                <h2>Recent Expenses</h2>
-                <div id="expense-list"></div>
+            <div id="expenses-tab" class="tab-content active">
+                <h2>Add Expense</h2>
+                <form id="expense-form">
+                    <div class="form-group">
+                        <label for="category">Category</label>
+                        <select id="category" name="category" required>
+                            <option value="">Loading...</option>
+                        </select>
+                    </div>
+                    <div class="form-group">
+                        <label for="value">Amount</label>
+                        <input type="number" id="value" name="value" step="0.01" min="0" required>
+                    </div>
+                    <div class="form-group">
+                        <label for="note">Note</label>
+                        <input type="text" id="note" name="note">
+                    </div>
+                    <button type="submit">Add Expense</button>
+                </form>
+
+                <div id="expense-list-section">
+                    <h2>Recent Expenses</h2>
+                    <div id="expense-list"></div>
+                </div>
+            </div>
+
+            <div id="statistics-tab" class="tab-content">
+                <div class="stats-header">
+                    <h2>Weekly Totals</h2>
+                    <div class="stats-controls">
+                        <button id="expand-all-btn" class="secondary-btn">Expand All</button>
+                        <button id="collapse-all-btn" class="secondary-btn">Collapse All</button>
+                    </div>
+                </div>
+                <div id="weekly-totals"></div>
             </div>
         </div>
     </div>
diff --git a/mft/static/style.css b/mft/static/style.css
index 8a44590..8789bd3 100644
--- a/mft/static/style.css
+++ b/mft/static/style.css
@@ -146,3 +146,143 @@ select:focus {
     font-style: italic;
     padding: 20px;
 }
+
+.tabs {
+    display: flex;
+    gap: 10px;
+    margin-bottom: 30px;
+    border-bottom: 2px solid #e0e0e0;
+}
+
+.tab-button {
+    background: transparent;
+    color: #666;
+    border: none;
+    padding: 10px 20px;
+    font-size: 16px;
+    cursor: pointer;
+    border-bottom: 3px solid transparent;
+    margin-bottom: -2px;
+    transition: all 0.2s;
+}
+
+.tab-button:hover {
+    background: transparent;
+    color: #3498db;
+    transform: none;
+}
+
+.tab-button.active {
+    color: #3498db;
+    border-bottom-color: #3498db;
+    font-weight: 600;
+}
+
+.tab-content {
+    display: none;
+}
+
+.tab-content.active {
+    display: block;
+}
+
+.stats-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 20px;
+}
+
+.stats-controls {
+    display: flex;
+    gap: 10px;
+}
+
+.secondary-btn {
+    background: #95a5a6;
+    padding: 8px 16px;
+    font-size: 14px;
+}
+
+.secondary-btn:hover {
+    background: #7f8c8d;
+}
+
+.totals-table {
+    width: 100%;
+    border-collapse: collapse;
+}
+
+.week-row {
+    cursor: pointer;
+    user-select: none;
+}
+
+.week-row td {
+    padding: 15px;
+    border-bottom: 1px solid #e0e0e0;
+}
+
+.week-row:hover {
+    background: #f8f9fa;
+}
+
+.week-date {
+    font-weight: 500;
+    color: #2c3e50;
+}
+
+.week-total {
+    text-align: right;
+    font-size: 1.1em;
+    font-weight: 600;
+    color: #e74c3c;
+}
+
+.expand-icon {
+    display: inline-block;
+    margin-right: 8px;
+    transition: transform 0.2s;
+    font-size: 0.8em;
+}
+
+.week-row.expanded .expand-icon {
+    transform: rotate(90deg);
+}
+
+.categories-row {
+    display: none;
+    background: #f8f9fa;
+}
+
+.categories-row.visible {
+    display: table-row;
+}
+
+.categories-row td {
+    padding: 0;
+}
+
+.categories-content {
+    padding: 10px 15px 15px 40px;
+}
+
+.category-item {
+    display: flex;
+    justify-content: space-between;
+    padding: 8px 0;
+    border-bottom: 1px solid #e8e8e8;
+}
+
+.category-item:last-child {
+    border-bottom: none;
+}
+
+.category-name {
+    color: #555;
+}
+
+.category-amount {
+    font-weight: 500;
+    color: #666;
+}