# STL Viewer vs CS PDF Editor

The clearest difference is ads: STL Viewer at none against CS PDF Editor's shown. CS PDF Editor's advantage is update cadence (every 3 weeks vs every 43 months). On price, in-app purchases, device support 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.

STL Viewer ships an update every 43 months, CS PDF Editor every 3 weeks. The most recent releases landed on October 8, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | STL Viewer | CS PDF Editor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (13 ratings)](https://appshunter.io/ios/app/cs-pdf-editor-scanner-app/id6471626000/reviews)** |
| Number of ratings | — | **13** |
| Positive reviews | — | 85.7% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 43 months | **Every 3 weeks** |
| Monetization | — | Ad-supported |
| Size | 4 MB | 82 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Felipe Marques de Barros](https://appshunter.io/developer/1459294806) | [MACROMATRIX (PRIVATE) LIMITED](https://appshunter.io/developer/1820476435) |

## What reviewers say

### STL Viewer

[App page](https://appshunter.io/ios/app/stl-viewer/id6445801487)

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

**In-app purchases:** none


### CS PDF Editor

[App page](https://appshunter.io/ios/app/cs-pdf-editor-scanner-app/id6471626000)

This app offers a comprehensive suite of tools for managing documents on iOS devices. It allows users to view, edit, and scan PDFs, convert Word documents to PDF, and add digital signatures. The app aims to enhance productivity and streamline document workflows for professionals and students.

**Highlights:** All Documents and PDF Viewer, Signature Pad, Word to PDF Conversion, PDF Editor and Annotator, Text Recognition Scan, Document Scanner

**In-app purchases:** none


## Frequently asked questions

### Is STL Viewer free?

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

### Is CS PDF Editor free?

CS PDF Editor is free to download, with no in-app purchases.

### Do STL Viewer or CS PDF Editor have ads?

CS PDF Editor shows ads; STL Viewer does not.

### Which is updated more often, STL Viewer or CS PDF Editor?

STL Viewer ships an update every 43 months, and CS PDF Editor every 3 weeks. Most recently, STL Viewer was updated on October 8, 2026 and CS PDF Editor on October 2, 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.*