# BioStep vs Douglas 3D Sizing

The clearest difference is update cadence: BioStep at fortnightly against Douglas 3D Sizing's every 2 months. Douglas 3D Sizing's advantage is iOS requirement (15.0 vs 17.6). 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.

BioStep ships an update fortnightly, Douglas 3D Sizing every 2 months. The most recent releases landed on September 7, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | BioStep | Douglas 3D Sizing |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/biostep/id1132497528/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Free | — |
| Size | 74 MB | 126 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [BioStep Inc](https://appshunter.io/developer/1132497527) | [TechMed 3D](https://appshunter.io/developer/964196047) |

## What reviewers say

### BioStep

[App page](https://appshunter.io/ios/app/biostep/id1132497528)

This app allows medical professionals to easily submit custom orthotic orders with detailed descriptions and images. It enables users to scan patient feet directly within the application.

**Highlights:** Submit custom orthotic orders, Detailed product descriptions, Image uploads for customization, Patient foot scanning, Secure professional access

**Features:** Vision Pro support

**In-app purchases:** none


### Douglas 3D Sizing

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BioStep free?

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

### Is Douglas 3D Sizing free?

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

### Do BioStep or Douglas 3D Sizing have ads?

Neither BioStep nor Douglas 3D Sizing shows ads.

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

BioStep ships an update fortnightly, and Douglas 3D Sizing every 2 months. Most recently, BioStep was updated on September 7, 2026 and Douglas 3D Sizing on September 15, 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.*