# SitSense Chrome Extension: Free Real-Time Posture Tracking The SitSense Chrome extension is a free, real-time posture tracker that monitors six clinical metrics using your webcam and on-device AI. According to Google Research (2023), the MediaPipe model it uses achieves landmark accuracy comparable to marker-based motion capture. The extension requires no account, uploads no video data, and runs 100% locally in your browser — making clinical-grade posture feedback accessible at zero cost. ## Why We Built It - **6.5 hrs**: average daily screen time for office workers (Bureau of Labor Statistics, 2024) - **80%**: of adults will experience back pain (American Chiropractic Association) - **17 min**: before posture degrades at a desk (Ergonomics Research, 2023) - **$0**: cost of the SitSense extension ## What Is the SitSense Chrome Extension? The SitSense Chrome extension is a free posture tracker that runs directly in your browser. It uses your webcam and on-device AI (MediaPipe) to analyze your posture in real time while you work. No video is ever recorded or uploaded. Everything stays on your machine. You do not need to create an account or enter any payment information. Install it from the Chrome Web Store, allow camera access, and it starts working immediately. The extension lives in a dedicated browser tab and monitors your posture continuously in the background. It is designed for anyone who spends hours at a computer and wants to catch bad posture habits before they turn into pain. The extension provides real-time coaching tips, sound alerts, and a visual silhouette showing your current posture. ## How It Works Getting started takes less than a minute. 1. **Install from the Chrome Web Store.** Click "Add to Chrome" and the extension installs instantly. No restart required. 2. **Allow camera access.** The extension needs your webcam to see your posture. All processing happens locally on your device — no video is uploaded or stored anywhere. 3. **Calibrate your position.** Sit in your best posture and click calibrate. This sets your personal baseline so the extension knows what good posture looks like for you and your specific setup. 4. **Work and improve.** The extension runs in the background while you work. When your posture degrades, you get a real-time alert with a specific tip on what to fix. Over time, you build the muscle memory for better posture. ## What It Tracks The extension monitors six posture metrics in real time, each with its own threshold for good, fair, and poor: - **Neck angle** — how much your neck tilts forward or to the side - **CVA (craniovertebral angle)** — the gold-standard measurement for forward head posture - **Shoulder slope** — whether one shoulder is higher than the other - **Head forward position** — how far your head sits in front of your spine - **Head tilt** — lateral tilt of your head to either side - **Slouch detection** — trunk angle and overall upper-body alignment ## Real-Time Coaching Tips The extension does not just tell you your posture is bad — it tells you exactly what to fix. When a specific metric crosses its threshold, you get a contextual tip like "Bring your head back over your shoulders" or "Level your shoulders." Tips are prioritized by severity. If multiple metrics are off, the extension focuses on the one causing the most strain. This keeps feedback actionable instead of overwhelming. You fix the biggest problem first, then the next one. ## Sound Alerts & Notifications The extension can play a gentle audio nudge when your posture has been poor for a sustained period. This is especially useful when you are deep in focus mode and not looking at the extension tab. You also get desktop notifications with a summary of what is off and a quick tip. Both sound alerts and notifications can be toggled on or off based on your preference. ## Extension vs SitSense Pro (Web App) The Chrome extension is completely free and requires no account. It gives you real-time posture monitoring, coaching tips, and alerts — everything you need to start improving your posture today. SitSense Pro (the web app) adds session tracking over time, a posture points system, detailed analytics and trend graphs, personalized AI analysis of your sessions, and a ranking system from Shrimp to Giraffe. If you want to track your progress over weeks and months, the Pro web app is the next step. Both use the same underlying AI and the same six posture metrics. The extension is the fastest way to get started with zero friction. ## Get Started in Under 60 Seconds Install the free SitSense Chrome extension and start tracking your posture right now. No account, no payment, no setup. Just click "Add to Chrome" and go. [Get the extension](/content/extension/index.html) ## Frequently Asked Questions ### Is the SitSense Chrome extension really free? Yes, completely free. No trial period, no account required, no payment information needed. The extension is free to use indefinitely with all features included. ### Does the extension upload my video or camera data? No. All posture analysis runs 100% locally on your device using on-device AI (MediaPipe). No video frames, images, or camera data are ever sent to any server. The extension works entirely offline after installation. ### Which browsers does the SitSense extension support? The extension is built for Google Chrome and other Chromium-based browsers like Microsoft Edge and Brave. It is available on the Chrome Web Store. ### How is the extension different from the SitSense web app? The extension is free and requires no account. It provides real-time posture monitoring and alerts. The web app (SitSense Pro) adds long-term session tracking, analytics, a posture points system, AI session analysis, and a ranking system. Both use the same AI and track the same six metrics. ### What kind of webcam do I need? Any standard webcam works, including built-in laptop cameras. The extension needs to see your head, neck, and shoulders. Position yourself so your upper body is visible in the camera frame. Good lighting helps accuracy.