# Douglas 3D Sizing vs Neural Study

The clearest difference is update cadence: Douglas 3D Sizing at every 2 months against Neural Study's every 26 months. Douglas 3D Sizing also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

Douglas 3D Sizing ships an update every 2 months, Neural Study every 26 months. Both last shipped on October 27, 2026.

## The numbers

| Metric | Douglas 3D Sizing | Neural Study |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 26 months |
| Size | 126 MB | 58 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [TechMed 3D](https://appshunter.io/developer/964196047) | [Cionic](https://appshunter.io/developer/1603292238) |

## What reviewers say

### Douglas 3D Sizing

[App page](https://appshunter.io/ios/app/douglas-3d-sizing/id1593445668)

**Features:** macOS Compatibility

**In-app purchases:** none


### Neural Study

[App page](https://appshunter.io/ios/app/neural-study/id6503488991)

**In-app purchases:** none


## Frequently asked questions

### Is Douglas 3D Sizing free?

Douglas 3D Sizing is free to download, with no in-app purchases.

### Is Neural Study free?

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

### Do Douglas 3D Sizing or Neural Study have ads?

Neither Douglas 3D Sizing nor Neural Study shows ads.

### Which is updated more often, Douglas 3D Sizing or Neural Study?

Douglas 3D Sizing ships an update every 2 months, and Neural Study every 26 months. Most recently, Douglas 3D Sizing was updated on October 27, 2026 and Neural Study on October 27, 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.*