diff --git a/public/app.js b/public/app.js
index 369d3b6..a017844 100644
--- a/public/app.js
+++ b/public/app.js
@@ -332,6 +332,21 @@ function markAllSeen(studentId, ids) {
   localStorage.setItem(inboxSeenKey(studentId), JSON.stringify([...ids]));
 }
 
+function renderGradeCard(r, isNew) {
+  const pct = r.points_possible ? Math.round((r.score / r.points_possible) * 100) : null;
+  const scoreClass = pct !== null ? (pct >= 80 ? 'score-good' : 'score-bad') : '';
+  const date = new Date(r.graded_at + 'Z').toLocaleDateString(undefined, { month: 'short', day: 'numeric' });
+  return `<div class="inbox-card${isNew ? ' inbox-new' : ''}">
+    <div class="inbox-card-header">
+      <span class="inbox-item-title">${esc(r.itemTitle)}</span>
+      ${isNew ? '<span class="feedback-badge">New!</span>' : ''}
+    </div>
+    <div class="inbox-meta">${esc(r.courseName)} · ${esc(r.unitName)} · ${date}</div>
+    ${r.points_possible !== null ? `<div class="inbox-score ${scoreClass}">🌟 ${r.score} / ${r.points_possible}${pct !== null ? ` (${pct}%)` : ''}</div>` : ''}
+    ${r.parent_comment ? `<div class="parent-comment">💬 ${esc(r.parent_comment)}</div>` : ''}
+  </div>`;
+}
+
 async function loadInbox() {
   const sid = currentStudent?.id;
   if (!sid) return;
@@ -340,29 +355,33 @@ async function loadInbox() {
     api(`/api/students/${sid}/messages`),
   ]);
   const seen = getSeenIds(sid);
+  const newItems = items.filter((r) => !seen.has(r.submissionId));
+  const gradedItems = items.filter((r) => seen.has(r.submissionId));
 
-  $('#inbox-empty').hidden = items.length > 0;
-  $('#inbox-list').innerHTML = items.map((r) => {
-    const pct = r.points_possible ? Math.round((r.score / r.points_possible) * 100) : null;
-    const isNew = !seen.has(r.submissionId);
-    const scoreClass = pct !== null ? (pct >= 80 ? 'score-good' : 'score-bad') : '';
-    const date = new Date(r.graded_at + 'Z').toLocaleDateString(undefined, { month: 'short', day: 'numeric' });
-    return `<div class="inbox-card${isNew ? ' inbox-new' : ''}">
-      <div class="inbox-card-header">
-        <span class="inbox-item-title">${esc(r.itemTitle)}</span>
-        ${isNew ? '<span class="feedback-badge">New!</span>' : ''}
-      </div>
-      <div class="inbox-meta">${esc(r.courseName)} · ${esc(r.unitName)} · ${date}</div>
-      ${r.points_possible !== null ? `<div class="inbox-score ${scoreClass}">🌟 ${r.score} / ${r.points_possible}${pct !== null ? ` (${pct}%)` : ''}</div>` : ''}
-      ${r.parent_comment ? `<div class="parent-comment">💬 ${esc(r.parent_comment)}</div>` : ''}
-    </div>`;
-  }).join('');
+  $('#inbox-list').innerHTML = newItems.map((r) => renderGradeCard(r, true)).join('');
+  $('#inbox-empty').hidden = newItems.length > 0;
+
+  $('#graded-list').innerHTML = gradedItems.map((r) => renderGradeCard(r, false)).join('');
+  $('#graded-empty').hidden = gradedItems.length > 0;
+
+  const newBadge = $('#inbox-new-badge');
+  if (newBadge) { newBadge.hidden = newItems.length === 0; newBadge.textContent = newItems.length; }
 
   markAllSeen(sid, items.map((r) => r.submissionId));
   updateInboxBadge(sid, 0);
   renderMsgThread(msgs);
 }
 
+document.querySelectorAll('.inbox-subtab').forEach((btn) => {
+  btn.addEventListener('click', () => {
+    document.querySelectorAll('.inbox-subtab').forEach((b) => b.classList.remove('active'));
+    btn.classList.add('active');
+    const sub = btn.dataset.sub;
+    $('#inbox-sub-new').hidden = sub !== 'new';
+    $('#inbox-sub-graded').hidden = sub !== 'graded';
+  });
+});
+
 function renderMsgThread(msgs) {
   const thread = $('#msg-thread');
   if (!thread) return;
diff --git a/public/index.html b/public/index.html
index daa7354..e15b78c 100644
--- a/public/index.html
+++ b/public/index.html
@@ -102,8 +102,18 @@
     </div>
 
     <div id="tab-inbox" class="tab-panel" hidden>
-      <div id="inbox-list"></div>
-      <p id="inbox-empty" class="hint" hidden>No grades yet — check back after your parent reviews your work!</p>
+      <div class="inbox-subtabs">
+        <button class="inbox-subtab active" data-sub="new">📬 New<span id="inbox-new-badge" class="feedback-badge" hidden></span></button>
+        <button class="inbox-subtab" data-sub="graded">📂 Graded</button>
+      </div>
+      <div id="inbox-sub-new">
+        <div id="inbox-list"></div>
+        <p id="inbox-empty" class="hint" hidden>No new grades — check back after your parent reviews your work!</p>
+      </div>
+      <div id="inbox-sub-graded" hidden>
+        <div id="graded-list"></div>
+        <p id="graded-empty" class="hint" hidden>No graded items yet.</p>
+      </div>
 
       <div class="msg-thread-wrap">
         <h2 class="msg-thread-title">💬 Messages</h2>
diff --git a/public/styles.css b/public/styles.css
index 1bd9e6d..dd5ae4c 100644
--- a/public/styles.css
+++ b/public/styles.css
@@ -1251,6 +1251,9 @@ body.bg-bubbles {
   border-left: 4px solid var(--good);
   font-size: 1.05rem;
 }
+.inbox-subtabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
+.inbox-subtab { flex: 1; padding: 0.5rem 1rem; border: 1.5px solid #e2dccf; border-radius: 999px; background: var(--card); color: var(--text); font-size: 0.9rem; font-weight: 600; cursor: pointer; position: relative; }
+.inbox-subtab.active { background: var(--accent); color: #fff; border-color: var(--accent); }
 .inbox-card { background: var(--card); border: 1.5px solid #e2dccf; border-radius: 14px; padding: 1rem; margin-bottom: 0.75rem; }
 .inbox-card.inbox-new { border-color: var(--accent); }
 .inbox-card-header { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.25rem; }