Comparison

JOA2023 vs Lumen

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

JOA2023

Features
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Welcome to the official mobile phone app for The 96th Annual Meeting of the Japanese Orthopaedic Association in Yokohama, JAPAN May 11 - May 14, 2023 Features include: - Search abstract by author's name, affiliation, keyword etc. - Create your itinerary with bookmarked sessions and your personal event - View the ongoing sessions onsite - View the venue map

About

Lumen

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Lumen opens the radiology zip your patient brought in. No upload, no cloud, no signup — just pixels, at native resolution, on every Apple device you own. Designed for healthcare professionals reviewing studies they already have authority to access. Lumen is positioned for education, case review, and second-read scenarios. It is NOT a medical device and is not intended for primary clinical diagnosis. WHAT YOU CAN OPEN • DICOM / IHE-PDI zip archives — the format most patient CDs ship as • ISO 9660 disk images directly, no manual mount or repackage needed • Folders of DICOM files • Open via Files.app, share sheet, or in-app picker • No file at hand? Five sample scans come with the app: real, de-identified CT, MRI and X-ray studies PERSISTENT LIBRARY • Every imported archive lives in your device's Lumen folder, visible in the Files app • Every scan shows a preview of its images, its modality and number of series • Re-open with one tap from the home screen; no re-importing • Delete an archive from its menu — along with all the videos exported from it VIEWING • Full native bit-depth display, with pinch zoom, drag pan, and double-tap toggle • Window/level by drag: vertical for brightness, horizontal for contrast — sensitivity scales with the active window so wide CT and narrow brain windows feel equally responsive • One-tap modality presets (CT: soft tissue, bone, lung, brain, abdomen, liver) • Per-instance metadata sheet with manufacturer, matrix, bit depth, transfer syntax, SOP class, and a built-in radiology acronym glossary VOLUMETRIC TOOLS • Automatic detection of stackable volumes from the slice geometry tags, with a 3D / 4D badge in the browser so you can see at a glance which series are reconstructable • Multi-planar reconstruction (MPR): axial, sagittal, and coronal reformats side by side, with crosshair-linked navigation — tap one plane to jump the other two • Slab projection: maximum-intensity (MIP), minimum-intensity (MinIP), or average over 3 to 50 slices — great for vessels, lungs, and noise reduction • True 3D volume rendering: a Metal-powered raycaster with four rendering modes — Surface (solid skin/bone shell with gradient lighting and per-volume tone presets), Anatomy (coloured tissue transfer function), Volume composite (grayscale translucent depth), and MIP • Tissue isolation presets per modality (bone, skin, soft tissue, lung, liver) — hide everything else from the volume with one tap, no per-slice masking • Two-finger pan, drag-rotate, pinch-zoom, auto-rotate cine, and an axis-aligned clipping plane (sagittal / coronal / axial) for cutting away half the volume to see inside • Save the current 3D view as a PNG snapshot at 2Ɨ the on-screen resolution, sharable via Photos, AirDrop, Files, or Mail DYNAMIC 4D ACQUISITIONS • Native support for dynamic contrast-enhanced series (e.g. dyn_eTHRIVE liver MR, perfusion MR, dynamic angio): every timepoint becomes its own 3D volume • Timepoint slider in MPR and 3D with cine playback — watch contrast wash through over time • All timepoints prefetched in the background and persisted to an on-device cache, so scrubbing across timepoints stays instant across launches SHARING • Export any series as an H.264 MP4 at 10, 15, or 30 fps • Saved next to its source archive in the Lumen folder of Files.app • Share via the standard share sheet, or copy to iCloud Drive • PNG snapshots of the 3D view share PRIVACY BY DEFAULT • Everything stays on this device • No analytics on file contents, no account, no tracking SDKs • Patient data leaves the device only when YOU choose to share an export • Lumen never connects to the internet: even the sample scans come with the app • A file that won't open? Lumen explains why and, if you want, emails us the technical details — never names, dates or images Lumen is intentionally positioned as an educational and second-read tool. It is not a regulated medical device in any jurisdiction. See the in-app disclaimer for the full statement.

Screenshots

JOA20232 screens
Lumen4 screens

Verdict

The call

The clearest difference is price: JOA2023 at Free against Lumen's $9.99. JOA2023 also leads on update cadence (every 2 days vs fortnightly) and iOS requirement (12.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

JOA2023 is free to download; Lumen costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

JOA2023 ships an update every 2 days, Lumen fortnightly. The most recent releases landed on October 19, 2026 and October 20, 2026 respectively.

Scorecard3 real differences Ā· 3 level
JOA2023 versus Lumen: the parameters behind the verdict, then further details
ParameterJOA2023Lumen
PriceFree — better$9.99
Update frequencyEvery 2 days — betterFortnightly
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, Mac, Vision Pro — better
Requires iOS12.0 — better17.0
Further details — not scored
Size35 MB166 MB
Age rating4+4+
DeveloperThe Japanese Orthopaedic AssociationMarco Tini

In-app purchases

None

JOA2023

No in-app purchases

None

Lumen

No in-app purchases

Questions

Is JOA2023 free?
JOA2023 is free to download, with no in-app purchases.
Is Lumen free?
Lumen costs $9.99, with no in-app purchases.
Do JOA2023 or Lumen have ads?
Neither JOA2023 nor Lumen shows ads.
Which is updated more often, JOA2023 or Lumen?
JOA2023 ships an update every 2 days, and Lumen fortnightly. Most recently, JOA2023 was updated on October 19, 2026 and Lumen on October 20, 2026.

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