# D vs PrecisionOS

The clearest difference is update cadence: PrecisionOS at every 6 weeks against D's every 3 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 3 months, PrecisionOS every 6 weeks. The most recent releases landed on October 5, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | D | PrecisionOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/precisionos-train-for-the-or/id6670274807/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | — | Ad-supported |
| Size | 14 MB | 116 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [D-Briefe Inc](https://appshunter.io/developer/1557592801) | [PrecisionOS](https://appshunter.io/developer/1765571367) |

## What reviewers say

### D

[App page](https://appshunter.io/ios/app/d-brief/id1557592799)

**Features:** macOS Compatibility

**In-app purchases:** none


### PrecisionOS

[App page](https://appshunter.io/ios/app/precisionos-train-for-the-or/id6670274807)

This app provides surgical residents with just-in-time VR training modules directly linked to upcoming OR cases. It offers AI-guided preparation and personalized performance insights to accelerate learning and improve clinical skills.

**Highlights:** AI-guided case preparation, Personalized performance insights, Streamlined OR preparation, Advanced clinical realism, Extensive scenario library

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is PrecisionOS free?

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

### Do D or PrecisionOS have ads?

Neither D nor PrecisionOS shows ads.

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

D ships an update every 3 months, and PrecisionOS every 6 weeks. Most recently, D was updated on October 5, 2026 and PrecisionOS 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.*