Limb Tracker · GDMTcare.com
Patient sign in Clinician view
Arm swelling check

A swelling check in under a minute, using just your phone.

A camera scan you can do at home, between clinic visits. Point your phone at your forearm and hold still — you'll see your measurement in centimeters, compared to your baseline.

Start a scan

Free to try, no account needed. You'll see your measurement in under a minute. We keep only the numbers, on your phone — never an image.

Arms supported now Legs in beta · preliminary
Your scan result
Step 01
Point at your forearm
Sitting down, arm relaxed.
Step 02
Hold still, under a minute
No tapping, no typing.
Step 03
See your reading
In centimeters, vs your baseline.
Your privacy
No photo or video is ever taken or saved — we keep only the measurements, in centimeters.
Measurements, not images

The camera reads a few lengths in centimeters and uses only those numbers. No photo or video is ever taken or uploaded.

Stays on your device

The whole calculation runs on your own phone. Nothing about what the camera sees ever leaves it.

Numbers only, on your device

Your readings — just a few lengths in centimeters — are kept on this phone so you can see your trend. No image is ever stored or sent. Sign in to carry that trend across devices and share it with your care team.

What patients see over time Example
This isn't your data — it's an example of a patient who checks daily. One scan is a snapshot; the value is the trend across both arms, against their baseline, over several days.
Both forearms up 1.8 cm
Watch zonea small rise — worth keeping an eye on
"Watch" is the middle of the three zones below — not an emergency, but a nudge to scan again tomorrow. Measured against this patient's own baseline, over the last 6 days.
A slow, even climb across both arms — too small to see by eye, but real on the tape. One scan wouldn't show it; six days does.
Patient view Both forearms · last 6 days Trending up
Right forearmLeft forearmToday

Sign in to keep your trend. Every reading is saved (numbers only) — so a slow rise shows up as a line, days before you'd feel it.

Coming soon Combined early-warning

When fluid is building, your limb volume and your resting heart rate tend to rise together — days before you'd feel breathless. Limb Tracker will read both and flag it early.

Both forearms+1.8 cm · 6 days
Apple Watch resting HR+6 bpm · 6 days
Early congestionlikely — tell your team
What your result means
Steady

In your usual range and holding flat.

Keep your routine
Watch

A little more than usual, or a small rise across both arms.

Scan again tomorrow
Rising

A clear rise versus your baseline, or new breathlessness.

Call your care team
On-device · only the measurement is used, never the image
No app required
A check, not a diagnosis
Scan your limb
00 / OVERVIEW Clinical pilot · v1.0 limb.GDMTcare.com

Standardized limb
circumference tracking, at home, between visits.

Pitting-edema is judged by eye today, and observers often disagree. This tool measures five circumferences across your hand and forearm from a single phone-camera sweep, each compared to your baseline (set with your clinician) — so changes between visits are measured in centimeters, not estimated.

①Rotate slowly (15s) ②Auto-capture every 10° ③Compared to baseline in cm 20s scan 5 sites 20 measurements On-device
01 / SCANNER  Live scan

Allow camera access, pick a limb, rotate. Auto-stops at 360°. All measurement happens on-device.

Camera is off
The camera is paused. Tap below to turn it back on and frame your arm.
Point the camera at your arm · then tap Start scan.
3D Model
Wrist L: --Wrist R: --
Forearm L: --Forearm R: --
Ankle L: --Ankle R: --
Edema: 0 Step: Idle
02 / RESULTS  3D reconstruction

Drag to rotate. Scroll to move along the limb. Pinch or use the on-screen buttons to zoom in on any cross-section.

No scan yet — run one above

Your 3D results will appear here.

Finish a scan above to see your limb rebuilt as an interactive 3D model with 20 cross-section measurements.