diff --git a/artifacts/urls.py b/artifacts/urls.py
index 12a717c..98323e3 100644
--- a/artifacts/urls.py
+++ b/artifacts/urls.py
@@ -21,4 +21,5 @@ urlpatterns = [
     path("settings/users/", views.settings_users, name="settings-users"),
     path("settings/demo-data/", views.settings_demo_data, name="settings-demo-data"),
     path("settings/storage/", views.settings_storage, name="settings-storage"),
+    path("settings/about/", views.settings_about, name="settings-about"),
 ]
diff --git a/artifacts/views.py b/artifacts/views.py
index d463611..555c121 100644
--- a/artifacts/views.py
+++ b/artifacts/views.py
@@ -307,8 +307,11 @@ class CapabilitiesView(APIView):
     def get(self, request):
         if not request.user.is_authenticated and resolve_token_user(request) is None:
             return HttpResponseForbidden("Login or a valid API token is required")
+        from daybook_project import __version__
+
         return Response(
             {
+                "version": __version__,
                 "artifact_kinds": [choice[0] for choice in Artifact.KIND_CHOICES],
                 "filters": ["source", "label", "day", "kind", "q"],
                 "views": ["rendered", "raw"],
@@ -1249,6 +1252,17 @@ def settings_users(request):
     )
 
 
+@login_required
+def settings_about(request):
+    from daybook_project import __version__
+
+    return render(
+        request,
+        "artifacts/settings_about.html",
+        {"active_section": "about", "version": __version__},
+    )
+
+
 @login_required
 def settings_demo_data(request):
     if request.method == "POST":
diff --git a/daybook_project/__init__.py b/daybook_project/__init__.py
index e69de29..29f4719 100644
--- a/daybook_project/__init__.py
+++ b/daybook_project/__init__.py
@@ -0,0 +1,4 @@
+# Single source of truth for the app version. Bump this, commit, then tag the
+# commit `vX.Y.Z` and deploy. Surfaced on Settings -> About and in
+# GET /api/capabilities ("version").
+__version__ = "0.1.0"
diff --git a/static/daybook.css b/static/daybook.css
index b784eb9..37002a3 100644
--- a/static/daybook.css
+++ b/static/daybook.css
@@ -990,6 +990,28 @@ kbd {
   word-break: break-all;
 }
 
+.about-head {
+  align-items: center;
+  display: flex;
+  gap: 1rem;
+  margin-bottom: 1.2rem;
+}
+
+.about-head h2 {
+  margin: 0;
+}
+
+.about-logo {
+  height: 3rem;
+  width: auto;
+}
+
+.about-version {
+  color: var(--muted);
+  font-size: 0.9rem;
+  margin: 0.15rem 0 0;
+}
+
 .keep-button.kept {
   background: var(--success-bg);
   border-color: var(--success-border);
diff --git a/templates/artifacts/_topbar.html b/templates/artifacts/_topbar.html
index 4c96a02..5dbcde5 100644
--- a/templates/artifacts/_topbar.html
+++ b/templates/artifacts/_topbar.html
@@ -12,6 +12,7 @@
     <div class="user-menu-dropdown" hidden data-user-menu>
       <a href="{% url 'settings-account' %}">Settings</a>
       <a href="{% url 'settings-demo-data' %}">Demo Data</a>
+      <a href="{% url 'settings-about' %}">About</a>
       <button type="button" data-theme-toggle>Dark mode</button>
       <form method="post" action="{% url 'logout' %}">{% csrf_token %}<button type="submit">Log out</button></form>
     </div>
diff --git a/templates/artifacts/settings_about.html b/templates/artifacts/settings_about.html
new file mode 100644
index 0000000..030847f
--- /dev/null
+++ b/templates/artifacts/settings_about.html
@@ -0,0 +1,20 @@
+{% extends "artifacts/settings_base.html" %}
+
+{% block settings_content %}
+  <div class="about-head">
+    <img class="about-logo" src="/static/logo.png" alt="">
+    <div>
+      <h2>Daybook</h2>
+      <p class="about-version">Version {{ version }}</p>
+    </div>
+  </div>
+
+  <p>A self-hosted, multi-user journal where AI agents, scripts, or people
+  publish artifacts — reports, HTML, decks, images, PDFs, JSON, CSV — and each
+  logged-in user browses their own time-ordered, label-filterable feed. The
+  server owns IDs, styling, and storage; agents publish content, not files.</p>
+
+  <p class="storage-note">Post to it with a personal API token from
+  Settings&nbsp;→&nbsp;Account; the current API capabilities (including this
+  version) are available at <code>/api/capabilities</code>.</p>
+{% endblock %}
diff --git a/templates/artifacts/settings_base.html b/templates/artifacts/settings_base.html
index 8e079a5..f88f06f 100644
--- a/templates/artifacts/settings_base.html
+++ b/templates/artifacts/settings_base.html
@@ -30,6 +30,7 @@
       {% if request.user.is_superuser %}
         <a class="{% if active_section == 'users' %}selected{% endif %}" href="{% url 'settings-users' %}">Users</a>
       {% endif %}
+      <a class="{% if active_section == 'about' %}selected{% endif %}" href="{% url 'settings-about' %}">About</a>
     </nav>
     <section class="settings-panel">
       {% if messages %}