# Medical KOS vs BondingOS

The clearest difference is in-app purchases: BondingOS at none against Medical KOS's 10. BondingOS also leads on iOS requirement (10.0 vs 12.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Medical KOS sells 9 one-off in-app purchases. BondingOS asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 13, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Medical KOS | BondingOS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 17 MB | 63 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [META Corporation Japan Ltd.](https://appshunter.io/developer/589751339) | [株式会社デンタルアロー](https://appshunter.io/developer/1440037216) |

## What reviewers say

### Medical KOS

[App page](https://appshunter.io/ios/app/medical-kos/id654909468)

Explore detailed 3D biological and medical content, including microscopic images and CT scans. Interact with models to adjust angles, size, and transparency for immersive learning. Supports viewing on mobile devices or external 3D displays.

**Highlights:** Stereoscopic 3D viewing, Interactive 3D model adjustment, External 3D display support, Content view history, 3D electron microscopy images, 3D CT scans and movies

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| META Biomedical CG Library 27 Human Brain Structure | $0.99 | one-time |
| META Biomedical CG Library 28 Evolution of the Vertebrate Brain | $0.99 | one-time |
| Kidney:Stereo SEM Atlas | $3.99 | one-time |
| dyed skull with annotation | $14.99 | one-time |
| Temporal bone fusion images... | $14.99 | one-time |
| Temporal bone dissection (EN) | $14.99 | one-time |
| Middle fossa layer dissection_ | $14.99 | one-time |
| Anterior petrosal approach | $19.99 | one-time |
| 上肢の関節の動的解剖　-筋骨格系を学ぶシリーズ３- | $24.99 | one-time |


### BondingOS

[App page](https://appshunter.io/ios/app/bondingos/id1440037217)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Medical KOS free?

Medical KOS is free to download, with in-app purchases available.

### Is BondingOS free?

BondingOS is free to download, with no in-app purchases.

### Do Medical KOS or BondingOS have ads?

Neither Medical KOS nor BondingOS shows ads.

### Which is updated more often, Medical KOS or BondingOS?

Medical KOS ships an update every 2 months, and BondingOS every 2 months. Most recently, Medical KOS was updated on November 13, 2026 and BondingOS on November 11, 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.*