diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0f66f08..04ee6cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,4 @@
+2026-08-26 14:57 UTC — Add progress/recently-added sort to Library browser
 2026-08-26 14:45 UTC — Redesign expandable lists to a leaner, flat style
 2026-08-26 14:27 UTC — Add expand all/collapse all to the course tree
 2026-08-26 14:13 UTC — Header/footer polish, fix dead link, add focus rings
diff --git a/README.md b/README.md
index c7fb7b8..92b7815 100644
--- a/README.md
+++ b/README.md
@@ -96,7 +96,8 @@ silently stay blank instead of erroring.
 
 **Library browsing**
 - Lazy-loading folder browser (grid or list view) with search, including an
-  opt-in transcript search across subtitle files
+  opt-in transcript search across subtitle files. Sortable by name,
+  progress, or how recently a course showed up in the library
 - Course cards show media file count, total video/audio runtime, and
   completion % at a glance
 - Cover art: uses a manually-placed `cover`/`folder`/`thumbnail`/`thumb`/
diff --git a/VERSION b/VERSION
index 51b7f31..84544b0 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2026-08-26 14:45 UTC — redesign expandable lists to a leaner, flat style
+2026-08-26 14:57 UTC — add progress/recently-added sort to Library browser
diff --git a/offlineu_core.py b/offlineu_core.py
index 48fc718..a2fcde2 100644
--- a/offlineu_core.py
+++ b/offlineu_core.py
@@ -1288,6 +1288,10 @@ def list_library_directory(dir_path: str, skip_hidden: bool = True) -> Dict[str,
             item['hidden'] = is_hidden
             item['favorited'] = os.path.abspath(entry_path_str) in favorite_set
             item['completion_percentage'] = _course_completion_percentage(entry, item['media_files'])
+            try:
+                item['mtime'] = entry.stat().st_mtime
+            except OSError:
+                item['mtime'] = 0
             items.append(item)
         else:
             if skip_hidden:
@@ -2078,6 +2082,10 @@ def search_library_courses(query: str) -> List[Dict[str, Any]]:
         item = _course_summary(course)
         item['favorited'] = os.path.abspath(str(course)) in favorite_set
         item['completion_percentage'] = _course_completion_percentage(course, item['media_files'])
+        try:
+            item['mtime'] = course.stat().st_mtime
+        except OSError:
+            item['mtime'] = 0
         results.append(item)
     return results
 
diff --git a/templates/course_dashboard.html b/templates/course_dashboard.html
index be6e6ac..56318f8 100644
--- a/templates/course_dashboard.html
+++ b/templates/course_dashboard.html
@@ -1243,6 +1243,8 @@
                     <select id="library-sort" class="library-sort-select" onchange="reapplySort()">
                         <option value="name-asc">Name (A→Z)</option>
                         <option value="name-desc">Name (Z→A)</option>
+                        <option value="progress">Progress</option>
+                        <option value="recently-added">Recently Added</option>
                     </select>
                     <div class="library-view-toggle">
                         <button type="button" class="view-toggle-btn" id="library-view-list-btn"
@@ -1889,9 +1891,19 @@
         function sortLibraryItems(items) {
             const order = document.getElementById('library-sort').value;
             const sorted = items.slice();
-            sorted.sort((a, b) => order === 'name-desc'
-                ? b.name.localeCompare(a.name)
-                : a.name.localeCompare(b.name));
+            // Directories have neither a completion_percentage nor an
+            // mtime (only courses do), so they naturally fall to the end
+            // under these two modes rather than needing separate grouping
+            // logic - falling back to name order among themselves/ties.
+            if (order === 'progress') {
+                sorted.sort((a, b) => (b.completion_percentage || 0) - (a.completion_percentage || 0) || a.name.localeCompare(b.name));
+            } else if (order === 'recently-added') {
+                sorted.sort((a, b) => (b.mtime || 0) - (a.mtime || 0) || a.name.localeCompare(b.name));
+            } else {
+                sorted.sort((a, b) => order === 'name-desc'
+                    ? b.name.localeCompare(a.name)
+                    : a.name.localeCompare(b.name));
+            }
             return sorted;
         }