# D vs CathDoc

The clearest difference is update cadence: CathDoc at every 3 weeks against D's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

D ships an update every 2 months, CathDoc every 3 weeks. The most recent releases landed on June 4, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | D | CathDoc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/d-visual/id6612027870/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 78 MB | 12 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [D-visual Medical Technology Co., Ltd](https://appshunter.io/developer/1761335012) | [Lumen Innovations, LLC](https://appshunter.io/developer/1489598636) |

## What reviewers say

### D

[App page](https://appshunter.io/ios/app/d-visual/id6612027870)

This platform revolutionizes AI-assisted surgery and remote diagnosis. It enhances surgical skills through demonstration and collaboration, ensuring precision with AI assistance and quality control. Access secure cloud storage for medical data anytime, anywhere.

**Highlights:** AI-assisted surgery, Remote diagnosis, Surgical demonstration, Real-time collaboration, Cloud storage, AI-powered quality control, Surgical summaries

**Features:** macOS Compatibility

**In-app purchases:** none


### CathDoc

[App page](https://appshunter.io/ios/app/cathdoc/id6757081293)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is CathDoc free?

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

### Do D or CathDoc have ads?

Neither D nor CathDoc shows ads.

### Which is updated more often, D or CathDoc?

D ships an update every 2 months, and CathDoc every 3 weeks. Most recently, D was updated on June 4, 2026 and CathDoc on September 18, 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.*