Draw your way
Freehand for speed, polygon and spline for crisp curved borders, 2D discs and true 3D spheres to paint — or erase — across slices at once.
For iPad · Apple Pencil · iPadOS 26
Learn to contour. Measured against the experts.
Stop guessing whether your contours are good. RadContour turns any iPad into a complete radiotherapy training workspace — pull real DICOM studies straight from Files or your PACS, contour with Apple Pencil and thirteen precision tools, and get the same four QA metrics the pros use on every structure, in seconds.
Coming to the App Store — every plan starts with a 7-day free trial. For education, research and technical evaluation — not a medical device.
The app
A training workstation
that fits in your bag.
No department workstation, no waiting for a free seat. Structure list, linked axial / sagittal / coronal panes, a live 3D surface view and the full tool palette — everything runs natively on the iPad, wherever you study.
Structure list & templates
Live 3D surface view
Contouring tools
Linked MPR panes
Contour
Thirteen tools.
One Pencil.
Repetitions build the skill — so the drawing has to feel effortless. Apple Pencil hover previews the brush before it touches down, a pinch resizes it mid-stroke, and undo covers everything. Draw a structure, then overlay the reference and see exactly what you missed.
Tools that read the image
Smart brush paints only tissue within a Hounsfield tolerance of your first touch. Region grow floods a structure from one tap. Nudge sculpts a boundary in or out.
Clean up in one tap
Interpolate between slices, close holes, smooth without losing volume, keep the largest piece — post-processing that turns a rough draft into a defensible contour.
Measure
Four metrics,
not one opinion.
Overlap alone hides boundary errors. Load an expert set as read-only ground truth, and RadContour pairs structures by name, computes the standard QA set side by side, and flags any pair with no shared volume. No letter grade to hide behind — raw metrics, judged in context.
- Dice similarity coefficient
- Volumetric overlap between your contour and the reference. 0.000
- Hausdorff distance, max
- The single worst boundary deviation, in millimetres. 0.0
- Hausdorff distance, percentile
- The same picture, without the single outlier. 0.0
- Mean surface distance
- Average separation across the whole shared boundary. 0.0
Values shown: left eye, RadContour structure set vs expert ground truth on the head-and-neck case below.
The workflow
A whole case,
start to finish.
RadContour Pro follows the same arc you'd walk at a workstation — import, contour, derive, register, evaluate, export — without ever leaving the iPad. Every stage ships with every plan.
Import from anywhere
Files, AirDrop and iCloud Drive — or straight from the PACS: query & retrieve over DIMSE or DICOMweb, or let the PACS push studies to the iPad while you work.
Auto-contour the OARs
On-device TotalSegmentator models — whole-body organs plus task models for head & neck, liver segments, lung vessels and more. One-tap organ presets; every result reviewed by you.
Derive the rest
PTV = CTV + margin, uniform or directional. Boolean algebra, density thresholds with live preview, walls, and an automatic External that finds the body outline for you.
Register & fuse
Automatic rigid registration on a drawn region, landmark and ROI-based fits, five fusion displays from checkerboard to spy glass — then copy structures through a verified result.
Evaluate the plan
Dose wash or isodose lines, DVH, per-structure statistics and clinical goals — D95, Vdose, Dmax, homogeneity and Paddick conformity — graded pass, marginal or fail. Sum doses across courses.
Export like a workstation
Spec-compliant RTSTRUCT — plus registration, plan and dose — to a folder or straight back to a server, with one-tap anonymisation on the way out.
Registration & plan evaluation
Fusion: two series aligned by automatic or manual rigid registration, blended in complementary colours. DVH: dose–volume histograms for the same plan on two structure sets — ground truth solid, RadContour dotted. Goals: per-structure clinical goals evaluated against the dose grid. Patient identifiers redacted.
Privacy
Your data stays
on the iPad.
Studies you load are parsed, rendered, segmented and graded locally — even the AI models run on the iPad's own silicon. RadContour has no analytics backend and uploads nothing to us; the only network traffic is to the DICOM node you configure yourself.
- Patient DICOM lives in private app storage, invisible to other apps and the Files browser
- On-device parsing, rendering, grading and AI inference — nothing leaves unless you export
- One-tap anonymisation on export; app-switcher privacy shield over displayed imaging
- Peer allowlist on inbound DICOM transfers, and receiving only runs while the app is on screen
You remain responsible for de-identification.
Anonymisation cannot guarantee removal of identifiers burned into image pixels
or held in unrecognised private attributes. Verify output before any data
leaves an authorised environment.
RadContour Pro
Try everything free
for 7 days.
RadContour launches on the App Store as a single Pro subscription — every module, every update, on all your iPads. Start with a full week free; cancel anytime in your Apple ID settings and pay nothing.
Monthly
Price announced at launch
- 7-day free trial, full access
- The complete six-stage workflow
- Cancel anytime through Apple
Yearly
Discounted — announced at launch
- 7-day free trial, full access
- The complete six-stage workflow
- Lowest effective monthly rate
- Cancel anytime through Apple
Billing is handled entirely by Apple through the App Store. Waitlist members hear first when pricing goes live.
Questions
Asked and
answered.
Which iPads does RadContour run on?
Any iPad running iPadOS 26 or later. Apple Pencil is strongly recommended for contouring — the brush previews under Pencil hover before it touches down — but every tool also works with your finger.
Does it work offline?
Yes. Parsing, rendering, contouring, AI segmentation and assessment all run on the iPad itself — imported cases stay fully usable with no connection at all. You only need a network to talk to a DICOM server.
Where does patient data go?
Nowhere. Studies live in the app's private storage on your iPad, invisible to other apps. RadContour has no analytics backend and sends nothing to us; data only leaves the device when you explicitly export or transfer it. You remain responsible for having the appropriate authorisation for any patient data you import.
Is RadContour a medical device?
No. RadContour is a research, education and training tool. It is not a certified medical device and is not intended for diagnosis, treatment planning, treatment delivery or any patient-care decision. Exported structure sets are marked UNAPPROVED by design, and every automatic result must be reviewed by a qualified professional before any use.
Can it talk to our PACS?
Yes — classic DIMSE (C-ECHO, C-FIND, C-GET, C-STORE) and DICOMweb (QIDO, WADO, STOW). It needs a node configured together with your IT department and belongs on a hospital-managed network; a dedicated IT setup guide ships with the app.
What can it import and export?
DICOM CT and MR series, RT structure sets, RT plans, RT dose and spatial registrations come in. Out goes a spec-compliant RTSTRUCT — plus registration, plan and dose objects — to a folder or a DICOM server, with one-tap anonymisation on export.
How does the AI work — and where does it run?
On-device, always. TotalSegmentator models handle whole-organ segmentation and MedSAM-based models power box-prompted suggestions — all inference happens on the iPad's own silicon, nothing is uploaded. Every AI contour is a starting point and must be reviewed against the images before use.
When does it launch, and what will it cost?
RadContour arrives on the App Store as a Pro subscription — monthly or yearly, each starting with a 7-day free trial, billed and cancellable through Apple. Prices are announced at launch, and the waitlist hears first.
Be first in line
Leave your email and you'll hear the moment RadContour reaches the App Store — plus early access when the TestFlight beta opens. Your 7-day free trial will be waiting. Nothing else, ever, and you can leave the list at any time.