# Vibra Test vs STL Simple Viewer

The clearest difference is rating: STL Simple Viewer at 4.3 against Vibra Test's 3.5. STL Simple Viewer also leads on ratings volume (909 vs 2) and update cadence (every 5 months vs every 18 months). Vibra Test's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price, review sentiment and device support there is nothing between them.

Both are free to download. STL Simple Viewer sells 4 in-app purchases, starting at $0.99 per 7 days. Vibra Test asks for nothing beyond the download.

STL Simple Viewer holds the better App Store score, 4.3 against 3.5. That said, the two scores are not equally well evidenced: STL Simple Viewer has 909 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 25% of Vibra Test's written reviews are positive against 18% of STL Simple Viewer's, so the app with the better star average is not the one people write more warmly about.

Vibra Test ships an update every 18 months, STL Simple Viewer every 5 months. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Vibra Test | STL Simple Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/vibra-test/id458780469/reviews) | **[4.3 (909 ratings)](https://appshunter.io/ios/app/stl-simple-viewer/id1493598400/reviews)** |
| Number of ratings | 2 | **909** |
| Positive reviews | **25.0% of reviews** | 18.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 18 months | **Every 5 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 19 MB |
| Requires iOS | **7.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Motionics LLC](https://appshunter.io/developer/424498959) | [Victor Bovio](https://appshunter.io/developer/327627515) |

## What reviewers say

### Vibra Test

[App page](https://appshunter.io/ios/app/vibra-test/id458780469)

This tool helps assess the vibration severity of rotating machinery according to ISO 10816-03 standards. Users input machine power, foundation type, and vibration velocity to determine the operating condition, displayed in color-coded zones.

**Highlights:** Vibration severity testing, ISO 10816-03 compliance, Machine power selection, Foundation type selection, Color-coded operating zones, Metric/Imperial units, Result sharing via email

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

**In-app purchases:** none


### STL Simple Viewer

[App page](https://appshunter.io/ios/app/stl-simple-viewer/id1493598400)

Easily view and interact with 3D STL CAD models. Supports various file types and offers advanced rendering options for detailed analysis. Get model information and explore interiors with clipping planes.

**Highlights:** View ASCII and Binary STL files, Load STL from ZIP, Rotate, pan, and zoom, Orthogonal and Perspective modes, Model info (triangle count, bounding box), Rendering options (faces, edges, transparency), Clipping plane for interiors

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro version (1 week plan) | $0.99 | per 7 days |
| Pro version (1 month plan) | $1.99 | per month |
| Remove Ads | $2.99 | one-time |
| Export Pack | $3.99 | one-time |

**What reviewers like**

- 🚀 Simple and intuitive viewer
- 👍 Useful viewing options
- 💡 Supports multiple file formats

**What reviewers complain about**

- 🐛 Frequent crashes
- 🔋 High battery consumption
- 🚨 Excessive and intrusive ads
- 🔍 Limited functionality for larger files

**Reported bugs**

- App crashes when opening larger STL files
- Inability to open some file formats
- Ads continue to appear even after paying for ad removal

**Requested features**

- Add ability to save color/lighting settings
- Improve stability and reduce crashes
- Provide an ad-free paid version


## Frequently asked questions

### Is Vibra Test free?

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

### Is STL Simple Viewer free?

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

### Which has better reviews, Vibra Test or STL Simple Viewer?

STL Simple Viewer is rated higher. Vibra Test averages 3.5 out of 5 from 2 ratings, while STL Simple Viewer averages 4.3 from 909 ratings.

### Do Vibra Test or STL Simple Viewer have ads?

STL Simple Viewer shows ads; Vibra Test does not.

### Which is updated more often, Vibra Test or STL Simple Viewer?

Vibra Test ships an update every 18 months, and STL Simple Viewer every 5 months. Most recently, Vibra Test was updated on October 14, 2026 and STL Simple Viewer on October 16, 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.*