# Rectangle Area Calculator vs STL Viewer

The clearest difference is price: Rectangle Area Calculator at Free against STL Viewer's $0.99. STL Viewer's advantage is ads (none vs shown) and chart position (#192 vs unranked). On update cadence, in-app purchases, device support and iOS requirement there is nothing between them.

Rectangle Area Calculator is free to download; STL Viewer costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Rectangle Area Calculator ships an update every 32 months, STL Viewer every 22 months. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Rectangle Area Calculator | STL Viewer |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 32 months | **Every 22 months** |
| Monetization | — | Free with in-app purchases |
| Best chart rank | — | **#192** |
| Size | 6 MB | 4 MB |
| Requires iOS | **16** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Josue Cuginguilua](https://appshunter.io/developer/1485279395) | [Felipe Marques de Barros](https://appshunter.io/developer/1459294806) |

## What reviewers say

### Rectangle Area Calculator

[App page](https://appshunter.io/ios/app/rectangle-area-calculator/id1546463138)

**Features:** macOS Compatibility

**In-app purchases:** none


### STL Viewer

[App page](https://appshunter.io/ios/app/stl-viewer-3d-print-and-mesh/id6445801487)

**Currently charting:** #192 Top Paid · Productivity (US App Store)

Visualize e inspecione modelos 3D STL em seu dispositivo. Oferece ferramentas avançadas para medição, análise de malha e geração de relatórios PDF. Ideal para engenharia, impressão 3D e revisão técnica.

**Highlights:** Multitouch rotation, pan, and zoom, Wireframe, X-Ray, and normal orientation modes, Precise point-to-point measurement, Interactive cutting plane, Mesh health diagnostics, Generate PDF technical reports

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

**In-app purchases:** none


## Frequently asked questions

### Is Rectangle Area Calculator free?

Rectangle Area Calculator is free to download, with no in-app purchases.

### Is STL Viewer free?

STL Viewer costs $0.99, with no in-app purchases.

### Do Rectangle Area Calculator or STL Viewer have ads?

Rectangle Area Calculator shows ads; STL Viewer does not.

### Which is updated more often, Rectangle Area Calculator or STL Viewer?

Rectangle Area Calculator ships an update every 32 months, and STL Viewer every 22 months. Most recently, Rectangle Area Calculator was updated on October 16, 2026 and STL Viewer on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*