Your wrists work all day.
How are they actually doing?
Jointy uses your iPhone's motion sensors to measure wrist rotation, control, flexibility, and steadiness — scoring both wrists independently on a 0–100 scale and tracking how they change over time.
The Problem
You track everything.
Not your wrists.
Steps, sleep, heart rate, calories — there's a number for all of it. But most people have zero visibility into how their wrists are actually moving. No baseline. No trend. No way to know if that stiffness is getting better or worse.
Jointy fixes that. Four short measurements, both wrists, one clear score. Run it today and you'll have a baseline. Run it again next week and you'll have a story.
No baseline to compare against
Without a starting measurement, you can't tell if your wrist function is improving, staying the same, or quietly declining.
Asymmetry goes undetected
Left and right wrists often perform measurably differently. Without scoring both, you'll never see the gap — or whether it's growing.
Changes happen too slowly to notice
Wrist stiffness and range-of-motion changes build gradually. Regular measurement makes the invisible visible.
Four measurements. Two wrists. One score.
How It Measures
4 key measurements.
10 seconds each.
Hold your iPhone in your hand. Follow the on-screen guide. That's it. Jointy's gyroscope and accelerometer capture motion at 60 samples per second — no wearable, no attachment, no setup.
Rotation
Forearm rotation range and smoothness — turning your palm up and down. Captured via gyroscope cumulative arc and jerk analysis.
Control
Wrist circle consistency and smoothness. Measures how evenly and steadily you can move through a full circular motion.
Flex
Flexion and extension arc. Jointy captures peak flexion (~60° baseline) and peak extension (~35° baseline) angles using the pitch sensor.
Stability
Hold-still steadiness. The accelerometer measures RMS tremor and sudden spikes over a 10-second hold. Less movement = higher score.
Getting Started
Three steps. Under two minutes.
No equipment, no calibration, no account. Download and start measuring immediately.
Hold your iPhone
Sit comfortably, arm at 90°, elbow tucked at your side. Hold the phone flat in your palm, screen up. Pinky and thumb for grip.
Complete 4 guided measurements
Each test is 10 seconds. On-screen animation shows you exactly what to do. Jointy reads your motion in real time.
Get your scores and track progress
Jointy shows your left score, right score, overall score, balance status, and subscore breakdown. Every session is logged. Come back tomorrow and see what changed.
Your Results
Know your baseline.
See what changes.
After each session, Jointy shows a complete picture — not just one number. You get left and right scores independently, a balance status, and a breakdown of all four measurements so you know exactly where to focus.
Progress Over Time
Not a one-time score.
A story that builds.
A single session gives you a snapshot. What makes Jointy worth opening every day is the trend — seeing whether your wrists are improving, holding steady, or telling you something needs attention.
Daily check-in
Run a full bilateral assessment in under 2 minutes. Every session is logged with full subscore and balance data.
Weekly report
After 7 days of check-ins, get a narrative weekly summary — which wrist improved, what your limiting dimension was, and what to focus on next week.
Where to focus
Jointy identifies your lowest subscore and recommends short guided wrist reset routines to target that specific area.
Asymmetry alerts
If your left/right gap widens across multiple sessions, Jointy flags it so you can investigate before it becomes a pattern.
Everything in the App
Built for people who take their wrist health seriously.
From your daily dashboard to your monthly data export, Jointy gives you a complete system.
Your complete wrist dashboard
See today's overall score, all four subscores, your left/right balance, daily streak, and where to focus — all at a glance.
Learn what your scores mean
Built-in guides explain every measurement, how scores are calculated, what asymmetry signals, and why each dimension matters for your wrists.
Export a full PDF report
Generate a detailed PDF of your wrist history — subscores, flex angles, control metrics, and stability readings — for your own records or to share.
Who It's For
Built for people who rely on their wrists every day.
Anyone who wants a structured, data-driven way to monitor wrist movement, stiffness, asymmetry, and progress over time.
Desk Workers
Hours of static wrist position build up over weeks. Jointy tracks the stiffness and range-of-motion changes that accumulate invisibly.
Gamers
Extended sessions put repetitive load on both wrists. Monitor rotation, control, and stability to catch changes before they become problems.
Musicians
Pianists, guitarists, and instrumentalists depend on precise, bilateral wrist function. Jointy gives a numeric picture of both wrists.
Gym & Fitness
Lifting, calisthenics, CrossFit — wrist loading changes function over time. Track your baseline and spot asymmetry early.
Tradespeople
High-demand hand work puts cumulative load on both wrists. Jointy helps you monitor that load between jobs and seasons.
Progress Trackers
For anyone who notices stiffness, asymmetry, or reduced range and wants numbers — not guesses — to understand what's happening.
Transparent by Design
Private. Honest. Safe to use.
Jointy is a measurement tool. We're clear about what it is, what it isn't, and exactly how it handles your data.
Your data stays on your device
All wrist motion data and scores are stored locally on your iPhone. Confirmed in Jointy's privacy manifest: NSPrivacyTracking: false. NSPrivacyCollectedDataTypes: empty. Nothing leaves your phone.
Not a diagnostic tool
Jointy measures wrist movement patterns and generates scores for self-tracking. It does not diagnose medical conditions, detect injuries, or replace clinical evaluation of any kind.
No account required
Download and start measuring immediately. No email, no sign-in, no account creation. No tracking across apps or websites.
Safety: Jointy measurements involve wrist movement. Stop immediately if any movement causes sharp, shooting, or worsening pain. Do not push past your comfortable range. Jointy is not a substitute for medical advice, diagnosis, or treatment. If you have wrist pain, numbness, tingling, a recent injury, or any medical concern, consult a qualified healthcare professional (physiotherapist, sports medicine doctor, or orthopaedic specialist) before using this app.
FAQ
Common questions
Straight answers about how Jointy works.
Get Started Free
Start measuring your wrist function today.
Two minutes. Both wrists. One clear score. Free to try with no account required.
Download on the App Store