# Speed Number 123 vs Dynamic Visual Acuity

The clearest difference is ads: Speed Number 123 at none against Dynamic Visual Acuity's shown. Speed Number 123 also leads on update cadence (every 6 days vs every 39 months) and iOS requirement (11.0 vs 14.1). On price, 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.

Speed Number 123 ships an update every 6 days, Dynamic Visual Acuity every 39 months. The most recent releases landed on September 26, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Speed Number 123 | Dynamic Visual Acuity |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 6 days** | Every 39 months |
| Size | 58 MB | 6 MB |
| Requires iOS | **11.0** | 14.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hideyuki Aono](https://appshunter.io/developer/1458194648) | [Saki Inoue](https://appshunter.io/developer/1557109246) |

## What reviewers say

### Speed Number 123

[App page](https://appshunter.io/ios/app/speed-number-123/id1639357178)

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

**In-app purchases:** none


### Dynamic Visual Acuity

[App page](https://appshunter.io/ios/app/dynamic-visual-acuity/id6447795260)

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

**In-app purchases:** none


## Frequently asked questions

### Is Speed Number 123 free?

Speed Number 123 is free to download, with no in-app purchases.

### Is Dynamic Visual Acuity free?

Dynamic Visual Acuity is free to download, with no in-app purchases.

### Do Speed Number 123 or Dynamic Visual Acuity have ads?

Dynamic Visual Acuity shows ads; Speed Number 123 does not.

### Which is updated more often, Speed Number 123 or Dynamic Visual Acuity?

Speed Number 123 ships an update every 6 days, and Dynamic Visual Acuity every 39 months. Most recently, Speed Number 123 was updated on September 26, 2026 and Dynamic Visual Acuity on October 16, 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.*