Posture monitoring for Windows
Catch yourself hunching before it hurts.
Spiner uses your webcam to notice when you drift toward the screen and gives you a gentle nudge to sit back — privately, on your device. Your camera feed never leaves your computer.
14-day free trial · no credit card required
Why posture matters
Your head weighs about 5 kg. Lean forward, and your spine carries far more.
Surgeon Kenneth Hansraj measured the load on the cervical spine at increasing head-tilt angles1. The numbers explain why a “small” slouch, held for hours, adds up:
What sustained forward head posture is associated with
Forward head posture overloads the deep neck flexors and upper trapezius, creating chronic tightness and the familiar end-of-day neck ache.
Overactive upper cervical muscles are a common driver of cervicogenic headaches that start at the base of the skull and creep forward.
Head position changes jaw mechanics. Sustained forward posture is linked to temporomandibular joint discomfort and clicking.
Rounded, forward shoulders impair shoulder-blade movement patterns, raising the risk of impingement during everyday reaching.
A collapsed chest position restricts the diaphragm, measurably reducing respiratory efficiency while you work.
Hours of screen time make slouching the default. The posture you hold most of the day is the posture your body adapts to.
1Hansraj KK. Assessment of stresses in the cervical spine caused by posture and position of the head. Surg Technol Int. 2014. · Further reading: Clark et al. 2014 on corrective exercise; reviews on forward head posture, cervicogenic headache and temporomandibular disorders. Spiner is a wellness tool, not a medical device.
How it works
Three steps, then it just runs.
Sit the way you'd like to keep sitting and click Calibrate. That healthy position becomes your personal baseline.
Drag the trigger-distance slider to choose how much lean-in is too much. A live marker shows exactly where you are right now.
Spiner runs quietly in the tray. The moment you cross your trigger distance, a native notification reminds you to sit back.
Features
Built to be glanced at, not managed.
Posture monitor
Always know where you stand. Or slouch.
A live camera card with your distance, your calibrated baseline and a color-coded trigger slider — green, amber, red. Recalibrate in one click whenever your seat or screen moves.
Reminders
Breaks and nudges, on your schedule.
Stretch breaks, hydration nudges, 20-20-20 eye breaks, stand-and-walk prompts — each on its own interval, days and active hours. Toggle any of them off when you need to focus.
Exercise library
Know exactly what to do on a break.
A built-in stretch library — neck rolls, shoulder shrugs, cat-cow, hip circles and more — searchable and filterable by body region, with durations that fit inside a coffee break.
Focused on work? One alert per slip, not a barrage. App in background? The camera switches off between periodic checks. Start and stop from the tray or a global shortcut.
Face detection runs entirely on your machine. No video is recorded, stored or uploaded — ever. The only thing Spiner sends home is your sign-in.
Pricing
Try everything free. Then less than a coffee.
Your trial ends quietly — no card on file, no automatic charge. If Spiner earned its keep, pick a plan inside the app; payments are handled securely by Stripe.
- ✓ Every feature included
- ✓ No credit card required
- ✓ We won't charge you when it ends — promise
- ✓ Unlimited posture monitoring
- ✓ Reminders & full exercise library
- ✓ Cancel anytime, keep the rest of the month
- ✓ Everything in Monthly
- ✓ Best value for daily desk workers
- ✓ One payment, no thinking about it
Your back will thank you in a week.
Download Spiner, calibrate once, and let it watch your posture so you don't have to.
Windows 10/11 · ~210 MB · 14-day free trial included
FAQ
Common questions
Spiner detects your face in the webcam frame and measures its apparent size — when you lean in, your face gets bigger in frame. You calibrate once with your healthy sitting position as the baseline, set a trigger distance, and Spiner notifies you whenever you cross it. No depth sensors needed; any ordinary webcam works.