Head pitch16°Sit tallStop
The problem
"Sit up straight" is not a plan
You've been told to fix your posture for years. Nobody ever told you what was actually wrong, by how much, or whether last month's stretching changed anything. So you straighten up for ten seconds, and forget by lunch.
The solution
Measured, not guessed
Two photos, and PostureLab gives you the number posture research actually uses — your craniovertebral angle — plus shoulder and pelvic tilt and a 0–100 score. Then a four-week program built from the faults your own scan found. Re-scan in a few weeks: the number either moved or it didn't.
On-device AI
Five points, one line, one number.
Apple's Vision framework finds your ear, shoulder, hip, knee and ankle in your side photo, drops a true vertical at the C7 vertebra, and measures the angle between them. All of it happens on your iPhone — the photo never leaves it.
- Ankle
- Knee
- Hip
- Shoulder
- Ear (tragus)
Craniovertebral angle
18°ScanWeek 1
Two photos. Three measurements.
Stand front-on, then side-on — the app fires the shutter itself once you hold the pose. On-device AI finds your ear, shoulder, hip, knee and ankle, and measures the angles between them.
Illustrative example · Week 1 — 18°, score 64
Normal
0–6°Moderate
6–12°Severe
12°+
0–6°Moderate
6–12°Severe
12°+
Shoulder tilt9°
Pelvic tilt6°
The numberWeek 1
The angle posture research actually uses.
Forward-head posture is measured as the craniovertebral angle, the standard photogrammetric method. You get the degrees, where they sit on the normal range, and what that means in plain words — not a "good / bad" verdict.
ProgramWeeks 1–4
A program built from your faults, not a generic stretch list.
Fourteen corrective exercises, picked and sequenced for the faults your scan actually found, across four weeks. Step-by-step cues are read out loud, so you're not squinting at a phone mid-stretch.
Chin tucks
3 × 10 reps · 2 min
Wall angels
3 × 12 reps · 3 min
Thoracic extension
2 × 8 reps · 2 min
All day
Your AirPods already know when you slouch.
PostureLab reads head pitch straight from the motion sensors in your AirPods and taps you when your neck drifts forward. Nothing extra to buy, no camera watching you — a quiet nudge, hands-free, all day.
Requires AirPods 3rd generation, Pro or Max.
The load
Tip your head forward and it gets heavier.
A human head weighs about 5 kg. Tip it 15° forward and the load your neck carries is closer to 12 kg; at 30°, roughly 18 kg. That is the biomechanical model posture research uses — and it is why a few degrees are worth measuring at all.
A model of load on the cervical spine (Hansraj, Surgical Technology International, 2014), based on head tilt — not a measurement of you, and not a prediction of injury.
0°~5 kg
15°~12 kg
30°~18 kg
Everywhere
One nudge, wherever you're sitting.
The slouch alert reaches your iPhone and taps your wrist on Apple Watch, with the live angle right there and Stop one tap away. A home-screen widget keeps the session going and shows how much of today you spent upright. And desk-break reminders run on your schedule — every 30, 50 or 90 minutes, only during your working hours, only on the days you pick.
Apple Watch and the widget are included — no extra purchase.
Desk breaks: every 30 / 50 / 90 min, 9:00–18:00, Mon–Fri.
PostureLab AInow
Sit up — you've been slouching 30s
Apple Watch
Forward-head angle
11°Illustrative example
Posture score
72Shoulder tilt
6°Week 1 · 18°
Week 6 · 11°
ProgressWeek 6
Watch the angle come down.
Every scan is a data point. The trend chart tracks your forward-head angle and posture score over weeks, and any two scans go side by side so you can see exactly what moved.
You can't fix what you never measured.
The measurement, live
Move the head. Watch the number.
93
/ 100
Aligned
Posture Score
Forward-head deviation2°Good
Normal
0–6°Moderate
6–12°Severe
12°+
0–6°Moderate
6–12°Severe
12°+
neutralforward
This is a neutral neck. Now push it forward.
That's the whole measurement. The app takes it from your own side photo — no slider, no guessing.
Scan your own postureA demo of the measurement, not a measurement of you.
How it works
01
Scan
Two photos, front and side. The analysis runs on your iPhone; nothing is uploaded.
02
Follow the program
Five minutes a day of exercises picked for the faults your scan found.
03
Re-scan
A few weeks later, take the same two photos and compare the angles side by side.
Pro
Pro is for what comes after the first number.
Available in the app — cancel anytime in Settings.
- The full breakdown — shoulder tilt, pelvic tilt and every fault the scan found
- Your personalized four-week correction program, with a guided player
- Unlimited scans, trend charts and side-by-side comparison
- The all-day AirPods posture coach
Questions
Is PostureLab AI medical advice?
No. It’s a measurement and self-tracking tool, for information only. It doesn’t diagnose or treat anything. If you’re in pain, see a healthcare professional — the numbers and the trend chart are useful things to bring along.
Do my photos leave my phone?
No. Your scan photos are analyzed on your iPhone using Apple’s on-device Vision framework and stored in the app’s own storage. There’s no account, no sign-up and no server of ours to send them to. "Delete all my data" in Settings really wipes every scan, photo and session.
How accurate is it?
The app measures the craniovertebral angle from your side photo — the same photogrammetric approach used in posture research — and the same for shoulder and pelvic tilt. What it’s good at is your own baseline and how it changes: shoot from a similar distance and angle each time and the trend is meaningful. It is not a clinical measurement and doesn’t replace an in-person assessment.
Do I need AirPods?
Only for the all-day posture coach, which reads head pitch from the motion sensors in AirPods (3rd generation, Pro or Max). Scanning, measuring, the program and progress tracking all work without them.
What’s free and what needs Pro?
Scanning, your posture score and your forward-head angle are free. Pro adds the full angle breakdown, your personalized four-week program, unlimited scans with trend charts and comparison, and the all-day AirPods coach. Current pricing is shown in the App Store and in the app.
How often should I re-scan?
Every three to four weeks. Posture angles move slowly — scanning daily mostly measures where you stood and how you held the phone, not progress.
Which iPhones does it support?
iPhone on iOS 17 or later. PostureLab AI is available in 11 languages.
How do I cancel?
Pro is an auto-renewable subscription handled by Apple. Open Settings → your name → Subscriptions on your iPhone and cancel there; access runs to the end of the paid period.
How do I get help?
Email [email protected] and a human answers. The Support page on this site has the common questions and the delete-my-data instructions.