# ScanPDF vs Stairstep

The clearest difference is ads: Stairstep at none against ScanPDF's shown. On price, update cadence, 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.

ScanPDF ships an update every 5 weeks, Stairstep monthly. Both last shipped on October 31, 2026.

## The numbers

| Metric | ScanPDF | Stairstep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/stairstep/id6781493653/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Monthly** |
| Monetization | — | Free |
| Size | 6 MB | 23 MB |
| Requires iOS | 26.0 | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Shuto Nishiyama](https://appshunter.io/developer/1879174354) | [Twarge LLC](https://appshunter.io/developer/6781456673) |

## What reviewers say

### ScanPDF

[App page](https://appshunter.io/ios/app/scanpdf-document-scanner/id6759512455)

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

**In-app purchases:** none


### Stairstep

[App page](https://appshunter.io/ios/app/stairstep/id6781493653)

View and inspect 3D models in STEP file format. Explore models with intuitive orbit, pan, and zoom controls, aided by a reference grid and scale bar. Access detailed geometry information including vertices, triangles, and dimensions.

**Highlights:** 3D model viewing, Orbit, pan, and zoom controls, Reference grid, Scale bar for size tracking, Geometry inspector, Dimension reporting

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ScanPDF free?

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

### Is Stairstep free?

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

### Do ScanPDF or Stairstep have ads?

ScanPDF shows ads; Stairstep does not.

### Which is updated more often, ScanPDF or Stairstep?

ScanPDF ships an update every 5 weeks, and Stairstep monthly. Most recently, ScanPDF was updated on October 31, 2026 and Stairstep on October 31, 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.*