diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..fbf55c5
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,15 @@
+# Changelog
+
+All notable changes to Moon Household Budget. Newest first.
+This file mirrors the structured changelog in `version.py` (shown at `/changelog`).
+
+## 0.1.0 — 2026-06-06 — First tracked release
+
+- Crash-safe data storage — saves are now atomic and a corrupted file can no longer take the app down.
+- Transactions moved to a SQLite database: faster, and safe when edited from two tabs at once. Existing transactions were migrated automatically.
+- New Settings page (⚙️) to store your Gmail login and reminder preferences securely — no passwords in the code anymore.
+- Suggestions & feedback (💡) is now reachable from every page; what you send becomes a tracked issue.
+- Bill email reminders now use the Gmail login from Settings.
+- Automatic daily backups of all your data (local for now; Backblaze cloud once a bucket is set up).
+- Fixed the Monthly view crashing on the budget total.
+- Added this version number and changelog.
diff --git a/app.py b/app.py
index 4a9af04..3753d92 100644
--- a/app.py
+++ b/app.py
@@ -8,6 +8,7 @@ import calendar as cal_module
 from storage import load_json, save_json
 from settings import load_settings, save_settings, SECRET_KEYS
 import txns_db
+from version import __version__ as APP_VERSION, CHANGELOG
 from categories import CATEGORIES, CATEGORY_COLORS
 from bills import load_bills, save_bills, bills_for_month, calendar_grid, get_week_num
 from sinking import (load_funds, save_funds, FUND_COLORS, monthly_needed,
@@ -167,6 +168,11 @@ def inject_unreviewed_count():
     # Fast COUNT query instead of parsing the whole transaction store per request.
     return dict(unreviewed_count=txns_db.count_unreviewed())
 
+
+@app.context_processor
+def inject_version():
+    return dict(app_version=APP_VERSION)
+
 DATA_DIR = os.environ.get("DATA_DIR", os.path.join(os.path.dirname(__file__), "data"))
 TRANSACTIONS_FILE = os.path.join(DATA_DIR, "transactions.json")
 RULES_FILE = os.path.join(DATA_DIR, "rules.json")
@@ -2878,5 +2884,10 @@ def settings_view():
                            saved=request.args.get("saved"))
 
 
+@app.route("/changelog")
+def changelog_view():
+    return render_template("changelog.html", changelog=CHANGELOG, app_version=APP_VERSION)
+
+
 if __name__ == "__main__":
     app.run(debug=os.environ.get("FLASK_DEBUG") == "1", port=5000)
diff --git a/templates/base.html b/templates/base.html
index fd6f9df..504285e 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -36,6 +36,12 @@
     {% endif %}
     {% block content %}{% endblock %}
   </main>
+  <footer style="text-align:center;padding:1.5rem 0 2.25rem;">
+    <a href="{{ url_for('changelog_view') }}" title="What's new"
+       style="display:inline-block;font-size:.75rem;color:#B0A89E;text-decoration:none;border:1px solid #EDE8E2;border-radius:999px;padding:.2rem .65rem;">
+      🌙 Moon Household Budget · v{{ app_version }}
+    </a>
+  </footer>
 <script>
 document.addEventListener('DOMContentLoaded', function () {
   // Wrap all number budget-inputs with a $ prefix and format on blur
diff --git a/templates/changelog.html b/templates/changelog.html
new file mode 100644
index 0000000..93030a1
--- /dev/null
+++ b/templates/changelog.html
@@ -0,0 +1,19 @@
+{% extends "base.html" %}
+{% block content %}
+<div style="max-width:720px;">
+  <h1>📒 What's New</h1>
+  <p style="color:#7A6E68;margin-bottom:1.25rem;">Current version: <strong>v{{ app_version }}</strong></p>
+
+  {% for rel in changelog %}
+  <div style="border:1px solid #EDE8E2;border-radius:10px;padding:1rem 1.25rem;margin-bottom:1rem;">
+    <div style="display:flex;align-items:baseline;gap:.6rem;flex-wrap:wrap;">
+      <h2 style="margin:0;font-size:1.1rem;">v{{ rel.version }}</h2>
+      <span style="color:#B0A89E;font-size:.85rem;">{{ rel.date }}{% if rel.title %} · {{ rel.title }}{% endif %}</span>
+    </div>
+    <ul style="margin:.6rem 0 0;padding-left:1.2rem;">
+      {% for c in rel.changes %}<li style="margin:.3rem 0;">{{ c }}</li>{% endfor %}
+    </ul>
+  </div>
+  {% endfor %}
+</div>
+{% endblock %}
diff --git a/version.py b/version.py
new file mode 100644
index 0000000..02a04d1
--- /dev/null
+++ b/version.py
@@ -0,0 +1,26 @@
+"""App version + changelog.
+
+To cut a release: bump __version__ and prepend a new entry to CHANGELOG
+(newest first), then keep CHANGELOG.md in sync. The version chip in the footer
+links to /changelog, which renders these entries.
+"""
+__version__ = "0.1.0"
+
+# Newest first. Each release lists what's new in plain language.
+CHANGELOG = [
+    {
+        "version": "0.1.0",
+        "date": "2026-06-06",
+        "title": "First tracked release",
+        "changes": [
+            "Crash-safe data storage — saves are now atomic and a corrupted file can no longer take the app down.",
+            "Transactions moved to a SQLite database: faster, and safe when edited from two tabs at once. Existing transactions were migrated automatically.",
+            "New Settings page (⚙️) to store your Gmail login and reminder preferences securely — no passwords in the code anymore.",
+            "Suggestions & feedback (💡) is now reachable from every page; what you send becomes a tracked issue.",
+            "Bill email reminders now use the Gmail login from Settings.",
+            "Automatic daily backups of all your data (local for now; Backblaze cloud once a bucket is set up).",
+            "Fixed the Monthly view crashing on the budget total.",
+            "Added this version number and changelog.",
+        ],
+    },
+]