With an AI posture checker that lives in your browser.
It taps you on the shoulder the moment you start to sink, so you can stop thinking about posture and get on with your work.
Works in Chrome, Edge and Safari. Asks for your camera; the image stays on this device.
It reads where your head is, not who you are. Nothing is uploaded, nothing is recorded.
Looking for you — sit in front of the camera.
Press Start. You'll get three short steps to read first, and nothing is measured until you press Ready.
Reads where your head is and which way it points.
Everybody does. And in ten minutes you'll be slouching again. Not because you don't know better, but because the work has your attention and your posture doesn't. Your head drifts toward the screen a centimetre at a time. You don't feel it. Your neck does.
What your neck holds up as your head tips forward
Loads from K. K. Hansraj, Surgical Technology International, 2014.
Timer reminders don't fix this. They go off every half hour whether you're slouching or not, and within a week you've learned to ignore them. SitNudge stays quiet while you sit well and speaks up only when you actually slump.
No app, no account, no settings to fiddle with.
Allow the camera. That's the whole installation.
Sit up straight, relaxed, eyes on the screen. Hold still for six seconds while it learns what good posture looks like on you: your chair, your desk, your body. Not a diagram from a textbook.
Start to slouch and, after a few seconds, a nudge tells you exactly what to fix: sit back, lift your eyes, straighten up. Sit up and it goes quiet.
Under the hood is MediaPipe, Google's on-device vision AI. Several times a second it works out where your head is and which way it points, from an ordinary webcam. It keeps just five numbers (distance, height, nod, tilt and turn) and drops the picture straight away. From those five numbers it reads four things, each measured against your own good posture, not anyone else's.
Your head creeping toward the screen, chin poked out or whole body leaning in. The classic tech neck.
Tipping your head to read the keyboard instead of the screen.
Sinking lower as your back rounds or you slide down the chair.
Leaning toward one shoulder, usually on the way to propping your head on an elbow.
It's smart about what isn't a slouch, too. Turn to check your second screen and it knows you're looking, not slumping, so it waits until you face the screen again. Glasses, a shadow or a hand on your chin won't throw it off either: it judges your whole head at once, not a few spots on it. Hover a card to watch it work.
Everything runs right here, inside your browser. Each frame goes from your webcam to the AI and stops there. Never uploaded, never recorded, never seen by anyone. Not even us: our server only ever handles payments, and it has no way to receive video.
Your camera image is analysed on your own machine, then thrown away. Nothing is sent anywhere.
No video, no photos, no snapshots. Press Stop and the camera switches off at once.
It reads where your head is, not who you are. It can't tell one person from another, and it never tries.
No sign-up, no password, no cookies, no analytics. Even your calibration is forgotten the moment you close the tab.
Don't take our word for it. Here's your browser's own network log after you press Start: the AI model downloads once, then silence.
We sat at a laptop and slouched on purpose, five different ways, with stretches of good posture in between. Then we counted how often each slouch got caught.
| Slouch | First version | Today |
|---|
Our first version tracked shoulders and ears, and it missed the chin-poke completely: the classic tech-neck move. So we rebuilt it around precise 3D head tracking and ran the same test again. One person, one session, so treat it as a demonstration rather than a clinical trial. The quickest way to judge it is to try it on yourself.
Your first 20 minutes are on us: no card, no sign-up. Long enough to set it up, get on with some work and feel the first nudge. Then pick whichever plan suits you. Every plan does everything.
Secure checkout by Stripe · Prices include tax · Cancel a subscription in two clicks · Already paid? · Have a gift code?
Know someone who slouches? Give SitNudge as a present, from $24. Pay once, nothing renews.No. The AI runs inside your browser, on your computer. Each camera frame becomes five numbers (how far away your head is, how high, and how much it nods, tilts and turns) and the picture is dropped on the spot. Nothing is uploaded, saved or shared, and even your calibration is forgotten when you close the tab.
No. It works out where your head is and which way it's pointing, and that's all. It doesn't know who you are, can't tell you apart from anyone else, and doesn't need to show your camera image at all. You can switch it on if you want to see what the camera sees.
No. Open this page in Chrome, Edge or Safari and press Start. The first time, it downloads the AI model (about 7 MB). No account and no sign-up, not even to pay.
Your first 20 minutes of real use are free, with no card and no sign-up. The clock only runs while it's switched on and you're at your desk: not while you read the setup steps, not while it's paused, and not while you're away. When the minutes are up, pick a plan to keep going.
Yes, and it makes a thoughtful one for anyone who spends their days at a screen. Choose a gift, pay once, and you'll get a gift code and a card to print, email or send by message. Nothing renews, and their year only starts when they open it. Received one? .
Your email is your key. On the other computer, press Log in and enter the email you paid with. We'll send you a link that unlocks it there, with no password to remember. The computer you paid on is unlocked straight away.
Yes, any time, in two clicks under Manage next to your plan. You keep it until the end of the month or year you've paid for, and you're never charged again. Lifetime is a single payment, so there's nothing to cancel. Moving from a subscription to lifetime stops the subscription for you.
Stripe, one of the world's largest payment companies. Your card details go straight to Stripe and we never see them. What we get back is your email and which plan you bought. Once you've paid, the page checks with our server about once a month that your plan is still active. That's the only thing it ever sends, and it contains no video.
Yes, as long as this tab stays open. Switch on Keep checking in background and nudges arrive as desktop notifications. Some browsers slow down tabs you're not looking at, so there's a one-minute test under the Start button that tells you honestly how well yours copes.
No. It only speaks up if you stay slouched for a few seconds (you choose how many), and it knows that turning to look at something isn't slouching. In a meeting? Snooze it for 15 minutes.
It doesn't compare you to a textbook. Every time you start, it learns your good posture in six seconds: in your chair, at your desk, as you sit today. Moved your laptop mid-session? Press Recalibrate.
Sit up, press Start, and let the AI keep you there.
20 minutes free · No card needed · Your video stays on your computer