diff --git a/apps/progress-bar/components/App.tsx b/apps/progress-bar/components/App.tsx
new file mode 100644
index 0000000..1d2d9e9
--- /dev/null
+++ b/apps/progress-bar/components/App.tsx
@@ -0,0 +1,49 @@
+import { Component } from '@geastack/core'
+import { ProgressBar, progressFraction } from '@geastack/elements'
+import { demo } from '../stores/DemoStore'
+
+export class App extends Component {
+  // The buttons drive #demo-bar. The .demo-cases bars below them never change;
+  // they cover default props, a fractional value with an empty label, a
+  // negative range, an inverted range and a NaN value for core's pipeline test.
+  template() {
+    return (
+      <div class="demo-app">
+        <span class="demo-title">ProgressBar</span>
+        <ProgressBar
+          id="demo-bar"
+          class={{ 'demo-bar': true, 'demo-bar--narrow': !demo.wide }}
+          value={demo.value}
+          min={demo.min}
+          max={demo.max}
+          indeterminate={demo.busy}
+          reducedMotion={demo.still}
+          label={demo.label}
+        />
+        <div class="demo-buttons">
+          <button class="demo-button" onClick={() => demo.step(-25)}>Minus</button>
+          <button class="demo-button" onClick={() => demo.step(25)}>Plus</button>
+          <button class="demo-button" onClick={() => demo.setValue(150)}>Over</button>
+          <button class="demo-button" onClick={() => demo.setValue(-20)}>Under</button>
+        </div>
+        <div class="demo-buttons">
+          <button class="demo-button" onClick={() => demo.zeroRange()}>Zero range</button>
+          <button class="demo-button" onClick={() => demo.toggleBusy()}>Busy</button>
+          <button class="demo-button" onClick={() => demo.toggleStill()}>Still</button>
+          <button class="demo-button" onClick={() => demo.toggleWide()}>Resize</button>
+        </div>
+        <div class="demo-buttons">
+          <button class="demo-button" onClick={() => demo.reset()}>Reset</button>
+        </div>
+        <div class="demo-cases">
+          <ProgressBar class="demo-case demo-case--defaults" />
+          <ProgressBar class="demo-case demo-case--default-range" value={25} />
+          <ProgressBar class="demo-case demo-case--fraction" value={33.34} label="" />
+          <ProgressBar class="demo-case demo-case--negative" value={-75.5} min={-100.5} max={-50.5} />
+          <ProgressBar class="demo-case demo-case--inverted" value={60} min={100} max={0} />
+          <ProgressBar class="demo-case demo-case--nan" value={NaN} label={'NaN gives [' + progressFraction(NaN, 0, 100) + ']'} />
+        </div>
+      </div>
+    )
+  }
+}
diff --git a/apps/progress-bar/env.d.ts b/apps/progress-bar/env.d.ts
new file mode 100644
index 0000000..dc50b2b
--- /dev/null
+++ b/apps/progress-bar/env.d.ts
@@ -0,0 +1,2 @@
+/// <reference types="@geastack/core" />
+declare module '*.css'
diff --git a/apps/progress-bar/index.tsx b/apps/progress-bar/index.tsx
new file mode 100644
index 0000000..46c9b1f
--- /dev/null
+++ b/apps/progress-bar/index.tsx
@@ -0,0 +1,5 @@
+import { mount } from '@geastack/core'
+import './styles.css'
+import { App } from './components/App'
+
+mount(App)
diff --git a/apps/progress-bar/package.json b/apps/progress-bar/package.json
new file mode 100644
index 0000000..8aaa3e4
--- /dev/null
+++ b/apps/progress-bar/package.json
@@ -0,0 +1,29 @@
+{
+  "name": "@geastack/example-progress-bar",
+  "type": "module",
+  "scripts": {
+    "check": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@geastack/core": "^0.1.41",
+    "@geastack/elements": "^0.1.6"
+  },
+  "gea": {
+    "id": "progress-bar",
+    "name": "Progress Bar",
+    "entry": "index.tsx",
+    "runtime": "gea",
+    "targets": {
+      "web": true,
+      "esp32": false
+    },
+    "launcher": {
+      "description": "progress bar states",
+      "order": 999,
+      "hidden": true
+    }
+  },
+  "private": true,
+  "license": "MIT",
+  "version": "0.1.0"
+}
diff --git a/apps/progress-bar/stores/DemoStore.ts b/apps/progress-bar/stores/DemoStore.ts
new file mode 100644
index 0000000..4e778ac
--- /dev/null
+++ b/apps/progress-bar/stores/DemoStore.ts
@@ -0,0 +1,61 @@
+import { Store } from '@geastack/core'
+
+// Every button drives one of the cases the ProgressBar has to handle, so the
+// app doubles as the fixture for core's progress-bar pipeline test.
+export class DemoStore extends Store {
+  value = 40
+  min = 0
+  max = 100
+  busy = false
+  still = false
+  wide = true
+
+  // ProgressBar clamps what it draws, not the app's value, so the app keeps its
+  // own value in range. Over and Under bypass this on purpose to exercise the
+  // bar's clamping.
+  step(delta: number) {
+    let next = this.value + delta
+    if (next > this.max) next = this.max
+    if (next < this.min) next = this.min
+    this.value = next
+  }
+
+  setValue(next: number) {
+    this.value = next
+  }
+
+  // min == max leaves the bar nothing to divide by; it must draw empty, not NaN.
+  zeroRange() {
+    this.min = 50
+    this.max = 50
+  }
+
+  reset() {
+    this.value = 40
+    this.min = 0
+    this.max = 100
+    this.busy = false
+    this.still = false
+    this.wide = true
+  }
+
+  toggleBusy() {
+    this.busy = !this.busy
+  }
+
+  toggleStill() {
+    this.still = !this.still
+  }
+
+  toggleWide() {
+    this.wide = !this.wide
+  }
+
+  get label(): string {
+    if (this.busy) return 'Working'
+    const range = 'value ' + this.value + ' of ' + this.min + '-' + this.max
+    return this.max > this.min ? range : range + ' (zero range)'
+  }
+}
+
+export const demo = new DemoStore()
diff --git a/apps/progress-bar/styles.css b/apps/progress-bar/styles.css
new file mode 100644
index 0000000..9c906db
--- /dev/null
+++ b/apps/progress-bar/styles.css
@@ -0,0 +1,51 @@
+body {
+  background-color: #f6f3ea;
+  color: #171713;
+  font-family: 'Inter';
+}
+
+.demo-app {
+  display: flex;
+  flex-direction: column;
+  padding: 24px;
+  gap: 20px;
+}
+
+.demo-title {
+  font-size: 28px;
+  font-weight: 700;
+}
+
+.demo-bar {
+  width: 300px;
+}
+
+.demo-bar--narrow {
+  width: 150px;
+}
+
+.demo-buttons {
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+  gap: 8px;
+}
+
+.demo-button {
+  width: 70px;
+  height: 44px;
+  background-color: #171713;
+  color: #ffffff;
+  font-size: 14px;
+  border-radius: 8px;
+}
+
+.demo-cases {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+}
+
+.demo-case {
+  width: 300px;
+}
diff --git a/apps/progress-bar/tsconfig.json b/apps/progress-bar/tsconfig.json
new file mode 100644
index 0000000..2388422
--- /dev/null
+++ b/apps/progress-bar/tsconfig.json
@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "lib": [
+      "ES2022"
+    ],
+    "strict": true,
+    "noEmit": true,
+    "skipLibCheck": true,
+    "jsx": "preserve",
+    "types": []
+  },
+  "include": [
+    "**/*.tsx",
+    "**/*.d.ts",
+    "../../node_modules/@geajs/vite-plugin/gea-env.d.ts"
+  ],
+  "exclude": [
+    "vite.config.ts"
+  ]
+}
diff --git a/docs/EXAMPLE-CATALOG.md b/docs/EXAMPLE-CATALOG.md
index f0ee5d2..cb02832 100644
--- a/docs/EXAMPLE-CATALOG.md
+++ b/docs/EXAMPLE-CATALOG.md
@@ -10,7 +10,7 @@ tests, and marketing proof.
 | Watch and wearable UI | `watch`, `watch-analog`, `watch-date`, `watch-face` | Compact layouts, clock/date rendering, small-screen app surfaces. |
 | Basic JSX apps | `counter-jsx`, `todo-jsx`, `static-card`, `stopwatch-jsx` | Component rendering, state updates, text/input, timers. |
 | Canvas and animation | `bouncing-balls`, `bouncing-balls-jsx`, `canvas-3d`, `canvas-3d-cube`, `css-3d-cube`, `css-animation-showcase` | Canvas drawing, CSS animation, frame loop, transform behavior. |
-| UI components | `settings`, `dialer`, `virtual-list`, `typography`, `bubble-grid`, `bubble-grid-jsx` | Higher-level controls, scroll behavior, text layout, launchable apps. |
+| UI components | `settings`, `dialer`, `virtual-list`, `progress-bar`, `typography`, `bubble-grid`, `bubble-grid-jsx` | Higher-level controls, scroll behavior, text layout, launchable apps. |
 | Games | `sky-hop`, `sky-hop-jsx`, `tic-tac-toe`, `tilt-breakout`, `button-tetris` | Interaction, simple game loops, collision/physics, deterministic logic. |
 | Device features | `camera-showcase`, `camera-studio`, `voice-notes`, `hid-clicker`, `weather`, `maps` | Target capabilities such as camera, audio, HID, network, and map assets. |
 | Apple/native experiments | `notes-jsx`, `notes-native`, `ios-device-showcase`, `ios-metal-*`, `ios-native-showcase`, `macos-native-showcase` | Apple target and native renderer experiments. |
diff --git a/package-lock.json b/package-lock.json
index d71e820..f80f8b4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1378,6 +1378,15 @@
         "vite": "latest"
       }
     },
+    "apps/progress-bar": {
+      "name": "@geastack/example-progress-bar",
+      "version": "0.1.0",
+      "license": "MIT",
+      "dependencies": {
+        "@geastack/core": "^0.1.41",
+        "@geastack/elements": "^0.1.6"
+      }
+    },
     "apps/reactive-child-probe": {
       "name": "@geastack/example-reactive-child-probe",
       "version": "0.1.0",
@@ -2823,6 +2832,10 @@
       "resolved": "apps/notes-windows",
       "link": true
     },
+    "node_modules/@geastack/example-progress-bar": {
+      "resolved": "apps/progress-bar",
+      "link": true
+    },
     "node_modules/@geastack/example-reactive-child-probe": {
       "resolved": "apps/reactive-child-probe",
       "link": true