# JOA2023 vs Lumen

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.

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

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

## The numbers

| Metric | JOA2023 | Lumen |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Fortnightly |
| Size | 35 MB | 166 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [The Japanese Orthopaedic Association](https://appshunter.io/developer/1462255873) | [Marco Tini](https://appshunter.io/developer/544232459) |

## What reviewers say

### JOA2023

[App page](https://appshunter.io/ios/app/joa2023/id6447340600)

**Features:** Vision Pro support

**In-app purchases:** none


### Lumen

[App page](https://appshunter.io/ios/app/lumen-dicom-viewer/id6776353922)

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*