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 keeps every session you log and turns sitting well into progress for a companion and a reef; paid opens any past session for review rather than only the last one. Both use the same pose model; the web app reads seven angles, and the extension reads six of those seven — everything except trunk angle.

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.

SitSense Chrome Extension: Free Real-Time Posture Tracking

Why We Built It

6.5 hrs
average daily screen time for office workers: 80%
of adults will experience back pain: 17 min
before posture degrades at a desk: $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.

01
Install from the Chrome Web Store
Click "Add to Chrome" and the extension installs instantly. No restart required.
02
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.
03
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.
04
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.

The SitSense web app goes further: sitting well feeds a companion you hatch, who brings a bleached reef back to colour one object at a time, and it keeps every session you have ever logged. Paid opens any past session for review rather than only your most recent one. If you want to follow your posture over weeks and months, the web app is the next step.

Both use the same underlying pose model. The web app reads seven posture metrics; the extension reads six of those seven — everything except trunk angle. The extension is the fastest way to start.

Questions people ask

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 keeps every session you log and turns sitting well into progress for a companion and a reef; paid opens any past session for review rather than only the last one. Both use the same pose model; the web app reads seven angles, and the extension reads six of those seven — everything except trunk angle.
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.

The thing this article is about

You can just add it to Chrome.

No account, no setup. It reads your posture in the browser and nothing is uploaded.

Add to Chrome

Free. Works the moment it installs.