OnFacesDetected
EventTriggered when faces are detected with the count of faces
| Parameter | Type |
|---|---|
| faceCount | number |
Extensions
MIT App Inventor
Kodular
Niotron
Android Builder
Thunkable
FaceDetection
Detect faces in real time with OpenCV and mark them directly in your app.
18 September 2026v2.0
Free
AI/ML
About
FaceDetection adds reliable real-time face detection to your projects. Leverage OpenCV to highlight faces with bounding rectangles, trigger responsive events, and build security or analytics experiences without leaving the App Inventor ecosystem.
Features
- Real-time face detection via device camera
- Automatic rectangles around detected faces
- FacesDetected, CameraError, and Error events
- Initialize detection inside any arrangement
- Start and stop detection on demand
- Count faces for analytics and automation
- Works alongside MotionDetection and CameraFilters
- Sample AIA project available for quick start
Documentation
OpenCV face detector on the live camera. Initialize into an arrangement; OnFacesDetected reports how many faces are in frame.
Docs5
OnCameraError
EventTriggered when camera error occurs
| Parameter | Type |
|---|---|
| errorMessage | text |
OnError
EventTriggered when WebView encounters an error
| Parameter | Type |
|---|---|
| errorCode | number |
| description | text |
| failingUrl | text |
Blocks5
Compatible platforms
MIT App InventorKodularNiotronAndroid BuilderThunkableRelated extensions
Motion Detection
Free
Detect real-time motion with OpenCV and highlight active areas using the device camera.
Groq
$7.99
Groq Compound, GPT-OSS, Qwen 3.6/3.8, Orpheus TTS, and Whisper STT — live models only, with MCP and streaming.
xAI Grok
$7.99
Grok 4.6 chat plus Grok Imagine image generation, with history, system prompts, and temperature control.
GFont
Free
Access 1500+ Google Fonts in your AI2 apps with ease. Download, apply, and customize fonts directly.