# D vs OBsmart Ultra

The clearest difference is update cadence: OBsmart Ultra at every 3 weeks against D's every 6 weeks. 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 6 weeks, OBsmart Ultra every 3 weeks. The most recent releases landed on October 5, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | D | OBsmart Ultra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Size | 47 MB | 25 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Shenzhen DiscoveryOpt Technology Co., Ltd.](https://appshunter.io/developer/1822511782) | [晓婷 谭](https://appshunter.io/developer/1884030144) |

## What reviewers say

### D

[App page](https://appshunter.io/ios/app/d-vision/id6479838973)

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

**In-app purchases:** none


### OBsmart Ultra

[App page](https://appshunter.io/ios/app/obsmart-ultra/id6761351263)

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is OBsmart Ultra free?

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

### Do D or OBsmart Ultra have ads?

Neither D nor OBsmart Ultra shows ads.

### Which is updated more often, D or OBsmart Ultra?

D ships an update every 6 weeks, and OBsmart Ultra every 3 weeks. Most recently, D was updated on October 5, 2026 and OBsmart Ultra on October 25, 2026.

---

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