# Fan Spec Performance vs STP Viewer

The clearest difference is price: STP Viewer at Free against Fan Spec Performance's $3.99. Fan Spec Performance's advantage is in-app purchases (none vs 3). On ads, device support and iOS requirement there is nothing between them.

STP Viewer is free to download; Fan Spec Performance costs $3.99 up front. STP Viewer sells 3 in-app purchases, starting at $1.99 per 7 days. Fan Spec Performance asks for nothing beyond the download.

## The numbers

| Metric | Fan Spec Performance | STP Viewer |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/stp-viewer-step-3d/id6770497525/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | — |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 44 MB |
| Requires iOS | 14.3 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [CODIGITAL SOLUTIONS](https://appshunter.io/developer/1829802387) |

## What reviewers say

### Fan Spec Performance

[App page](https://appshunter.io/ios/app/fan-spec-performance/id498089949)

**Features:** macOS Compatibility

**In-app purchases:** none


### STP Viewer

[App page](https://appshunter.io/ios/app/stp-viewer-step-3d/id6770497525)

This application allows users to open and view large, complex 3D CAD files on their mobile devices. It supports standard STEP and STP file formats, offering smooth navigation and offline accessibility for professionals and enthusiasts alike.

**Highlights:** Open STP and STEP files, Fluid 3D navigation (orbit, pan, zoom), Instant file loading from various sources, View complex assemblies, Offline accessibility, Battery and RAM efficient, Supports files from major CAD software

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Access | $1.99 | per 7 days |
| Pro Access | $4.99 | per month |
| Pro Access | $9.99 | per year |


## Frequently asked questions

### Is Fan Spec Performance free?

Fan Spec Performance costs $3.99, with no in-app purchases.

### Is STP Viewer free?

STP Viewer is free to download, with in-app purchases available.

### Do Fan Spec Performance or STP Viewer have ads?

Neither Fan Spec Performance nor STP Viewer shows ads.

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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.*