diff --git a/frontend/src/ContextMenu.tsx b/frontend/src/ContextMenu.tsx
index 7b74ea5..fa4c50d 100644
--- a/frontend/src/ContextMenu.tsx
+++ b/frontend/src/ContextMenu.tsx
@@ -2,6 +2,9 @@ import React, { useState, useCallback, useEffect, useRef, useMemo } from 'react'
 import { socketSpecAcceptsType } from './constants';
 import { outputTypeCanConnectToTarget } from './connectionUtils';
 import { compareMenuNodes, compareMenuCategories } from './canvasEvents';
+import { useFavorites } from './favorites';
+
+const FAVORITES_CATEGORY = 'favorites';
 
 export default function ContextMenu({
   x,
@@ -26,6 +29,7 @@ export default function ContextMenu({
   selectedNodeCount?: number;
   onCreateGroup?: (() => void) | null;
 }) {
+  const favorites = useFavorites();
   const [openCat, setOpenCat] = useState<string | null>(null);
   const [search, setSearch] = useState('');
   const [selectedIndex, setSelectedIndex] = useState(0);
@@ -88,13 +92,31 @@ export default function ContextMenu({
         });
       }
     }
-    return Object.values(cats)
+    const sorted = Object.values(cats)
       .map((category: any) => ({
         ...category,
         items: [...category.items].sort(compareMenuNodes),
       }))
       .sort(compareMenuCategories);
-  }, [nodeDefs, filterDirection, filterSpec, filterType]);
+
+    const favItems: any[] = [];
+    const seenFav = new Set<string>();
+    for (const category of sorted) {
+      for (const item of category.items) {
+        if (favorites.has(item.className) && !seenFav.has(item.className)) {
+          seenFav.add(item.className);
+          favItems.push(item);
+        }
+      }
+    }
+    if (favItems.length > 0) {
+      return [
+        { name: FAVORITES_CATEGORY, order: -Infinity, items: favItems.sort(compareMenuNodes) },
+        ...sorted,
+      ];
+    }
+    return sorted;
+  }, [nodeDefs, filterDirection, filterSpec, filterType, favorites]);
 
   // Flat filtered list for search
   const searchResults = useMemo(() => {
@@ -262,10 +284,12 @@ export default function ContextMenu({
               <div
                 key={cat}
                 ref={(el) => { catRowRefs.current[cat] = el; }}
-                className={`ctx-cat-item${openCat === cat ? ' ctx-cat-active' : ''}`}
+                className={`ctx-cat-item${openCat === cat ? ' ctx-cat-active' : ''}${cat === FAVORITES_CATEGORY ? ' ctx-cat-favorites' : ''}`}
                 onMouseEnter={() => handleCatEnter(cat)}
               >
-                <span className="ctx-cat-label">{cat}</span>
+                <span className="ctx-cat-label">
+                  {cat === FAVORITES_CATEGORY ? '♥ favorites' : cat}
+                </span>
                 <span className="ctx-cat-arrow">▶</span>
               </div>
             ))}
diff --git a/frontend/src/CustomNode.tsx b/frontend/src/CustomNode.tsx
index 0c8860f..0f53b1d 100644
--- a/frontend/src/CustomNode.tsx
+++ b/frontend/src/CustomNode.tsx
@@ -24,6 +24,7 @@ import {
 import { getGroupMinimumSize } from './groupSizing';
 import { buildCombinedInputNameByWidgetName, formatUiLabel } from './nodeWidgetLayout';
 import { applySIPrefix, formatNumericCell, formatTableRowCell, getTableColumns, parseNumberWithUnit, formatSI, parseSI } from './valueFormatting';
+import { useIsFavorite, toggleFavorite } from './favorites';
 
 import type { NodeData, NodeContextValue, InputSpec, InputOptions, WidgetDescriptor, PreviewPayload, OverlayData } from './types';
 
@@ -1001,6 +1002,7 @@ function NodeTable({ rows }: { rows: Array<Record<string, unknown>> }) {
 function CustomNode({ id, data }: { id: string; data: NodeData }) {
   const ctx = useContext(NodeContext);
   const def = data.definition;
+  const favorited = useIsFavorite(data.className);
   const scalarDisplay = formatScalarDisplay(data.scalarValue);
   const processingTimeText = formatProcessingTime(data.processingTimeMs);
   const nodeWidth = useStore(
@@ -1244,6 +1246,14 @@ function CustomNode({ id, data }: { id: string; data: NodeData }) {
         <div className="node-title-left">
           <span className="node-title-main">{data.label}</span>
           <button className="node-help-btn nodrag nopan" title="Documentation" onClick={(e) => { e.stopPropagation(); ctx?.openHelp(data.label); }}>?</button>
+          <button
+            className={`node-fav-btn nodrag nopan${favorited ? ' is-favorited' : ''}`}
+            title={favorited ? 'Remove from favorites' : 'Add to favorites'}
+            aria-pressed={favorited}
+            onClick={(e) => { e.stopPropagation(); toggleFavorite(data.className); }}
+          >
+            {favorited ? '♥' : '♡'}
+          </button>
         </div>
         {headerMeta && <span className="node-title-meta" title={headerMeta}>{headerMeta}</span>}
       </div>
diff --git a/frontend/src/favorites.ts b/frontend/src/favorites.ts
new file mode 100644
index 0000000..c83122f
--- /dev/null
+++ b/frontend/src/favorites.ts
@@ -0,0 +1,68 @@
+import { useSyncExternalStore } from 'react';
+
+const STORAGE_KEY = 'tono_favorite_nodes';
+
+let favorites: Set<string> = loadFromStorage();
+const listeners = new Set<() => void>();
+
+function loadFromStorage(): Set<string> {
+  if (typeof localStorage === 'undefined') return new Set();
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY);
+    if (!raw) return new Set();
+    const parsed = JSON.parse(raw);
+    if (!Array.isArray(parsed)) return new Set();
+    return new Set(parsed.filter((x): x is string => typeof x === 'string'));
+  } catch {
+    return new Set();
+  }
+}
+
+function persist(): void {
+  if (typeof localStorage === 'undefined') return;
+  try {
+    localStorage.setItem(STORAGE_KEY, JSON.stringify([...favorites]));
+  } catch {
+    // Storage full or disabled — ignore.
+  }
+}
+
+function notify(): void {
+  for (const cb of listeners) cb();
+}
+
+export function getFavorites(): Set<string> {
+  return favorites;
+}
+
+export function isFavorite(className: string): boolean {
+  return favorites.has(className);
+}
+
+export function toggleFavorite(className: string): void {
+  const next = new Set(favorites);
+  if (next.has(className)) next.delete(className);
+  else next.add(className);
+  favorites = next;
+  persist();
+  notify();
+}
+
+function subscribe(cb: () => void): () => void {
+  listeners.add(cb);
+  return () => {
+    listeners.delete(cb);
+  };
+}
+
+export function useFavorites(): Set<string> {
+  return useSyncExternalStore(subscribe, getFavorites, getFavorites);
+}
+
+export function useIsFavorite(className: string): boolean {
+  return useSyncExternalStore(
+    subscribe,
+    () => favorites.has(className),
+    () => favorites.has(className),
+  );
+}
diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index 438083f..cec2448 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -792,6 +792,34 @@ html, body, #root {
   border-color: var(--node-help-btn-border-hover);
 }
 
+.node-fav-btn {
+  width: 15px;
+  height: 15px;
+  border-radius: 50%;
+  background: var(--node-help-btn-bg);
+  border: 1px solid var(--node-help-btn-border);
+  color: var(--node-help-btn-text);
+  font-size: 11px;
+  font-weight: 700;
+  line-height: 1;
+  padding: 0;
+  cursor: pointer;
+  flex-shrink: 0;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  transition: background 0.15s, border-color 0.15s, color 0.15s;
+}
+
+.node-fav-btn:hover {
+  background: var(--node-help-btn-bg-hover);
+  border-color: var(--node-help-btn-border-hover);
+}
+
+.node-fav-btn.is-favorited {
+  color: #ffffff;
+}
+
 /* ── Node help panel ─────────────────────────────────────── */
 
 .node-help-tabs {
@@ -2484,6 +2512,9 @@ html, body, #root {
 .ctx-cat-active .ctx-cat-arrow {
   color: var(--text-primary);
 }
+.ctx-cat-favorites .ctx-cat-label {
+  text-transform: none;
+}
 
 /* ── Submenu panel (separate fixed-position sibling) ── */
 .ctx-submenu {