# STL File Viewer Pro vs SiteGrade

The clearest difference is ads: SiteGrade at none against STL File Viewer Pro's shown. STL File Viewer Pro's advantage is update cadence (fortnightly vs every 5 weeks) and chart position (#61 vs unranked). On price, in-app purchases and device support there is nothing between them.

Both are free to download. STL File Viewer Pro sells 3 in-app purchases, starting at $1.99 per 7 days and SiteGrade sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

STL File Viewer Pro ships an update fortnightly, SiteGrade every 5 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | STL File Viewer Pro | SiteGrade |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (81 ratings)](https://appshunter.io/ios/app/stl-file-viewer-pro/id6741022143/reviews)** | — |
| Number of ratings | **81** | — |
| Positive reviews | 10.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#61** | — |
| Size | 16 MB | 6 MB |
| Requires iOS | **16.6** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Andeesh Mehdi Syed](https://appshunter.io/developer/1676226599) | [JonesLabs LLC](https://appshunter.io/developer/6776067274) |

## What reviewers say

### STL File Viewer Pro

[App page](https://appshunter.io/ios/app/stl-file-viewer-pro/id6741022143)

**Currently charting:** #61 Top Grossing · Developer Tools, #207 Top Free · Developer Tools (US App Store)

Easily view, rotate, and inspect 3D STL files on your iPhone or iPad. Load models instantly from various sources for 3D printing, design review, or engineering inspection.

**Highlights:** Instant STL file loading, Full 360° rotation and zoom, Sharp detail rendering, Light and dark mode support, Lightweight and fast performance, Open files from Files, email, AirDrop

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Monthly | $3.99 | per month |
| Ad Free for 1 Year | $24.99 | per year |


### SiteGrade

[App page](https://appshunter.io/ios/app/sitegrade-security-check/id6790558285)

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SiteGrade Pro | $6.99 | one-time |


## Frequently asked questions

### Is STL File Viewer Pro free?

STL File Viewer Pro is free to download, with in-app purchases available.

### Is SiteGrade free?

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

### Do STL File Viewer Pro or SiteGrade have ads?

STL File Viewer Pro shows ads; SiteGrade does not.

### Which is updated more often, STL File Viewer Pro or SiteGrade?

STL File Viewer Pro ships an update fortnightly, and SiteGrade every 5 weeks. Most recently, STL File Viewer Pro was updated on October 24, 2026 and SiteGrade on October 25, 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.*