# Strobe Light Tachometer vs STL Simple Viewer

Strobe Light Tachometer and STL Simple Viewer both sit at 4.2 stars, but that hides the real split: 63% of Strobe Light Tachometer's written reviews are positive against 17% of STL Simple Viewer's. Strobe Light Tachometer also leads on in-app purchases (none vs 4) and ads (none vs shown). STL Simple Viewer's advantage is ratings volume (866 vs 277). On price, rating 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. Strobe Light Tachometer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.2 for Strobe Light Tachometer against 4.3 for STL Simple Viewer. Both are backed by a comparable volume of ratings — 277 and 866 respectively. Written reviews are what separate them: 63% of Strobe Light Tachometer's written reviews are positive against 17% of STL Simple Viewer's.

Strobe Light Tachometer ships an update every 7 months, STL Simple Viewer every 20 months. The most recent releases landed on September 22, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Strobe Light Tachometer | STL Simple Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (277 ratings)](https://appshunter.io/ios/app/strobe-light-tachometer/id978182913/reviews) | **[4.3 (866 ratings)](https://appshunter.io/ios/app/stl-simple-viewer/id1493598400/reviews)** |
| Number of ratings | 277 | **866** |
| Positive reviews | **63.2% of reviews** | 17.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 7 months** | Every 20 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 4 MB | 19 MB |
| Requires iOS | **7.0** | 17.0 |
| Devices | iPhone, 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

### Strobe Light Tachometer

[App page](https://appshunter.io/ios/app/strobe-light-tachometer/id978182913)

Transform your iPhone into a powerful strobe light and tachometer. Precisely control flashing speeds from 1Hz to 130Hz to measure the RPM of rotating objects by making them appear stationary. Ideal for precise speed measurements in dark environments.

**Highlights:** Adjustable strobe speed (1-130Hz / 60-7800RPM), Quick adjustment buttons (x2, ÷2), Fine-tuning buttons for precise speed, Manual RPM input, Display speed in Hz and RPM, Light/dark background option

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

**In-app purchases:** none

**What reviewers like**

- ✅ Accurate frequency and RPM measurements
- 👍 Simple and user-friendly interface
- 🎓 Excellent educational tool for teaching frequency concepts
- 💰 Free application
- ⚡ Quick and easy to use, even one-handed

**What reviewers complain about**

- 💡 LED flash brightness is too dim
- 🐛 Strobe light cuts out or blacks out intermittently
- 🐛 Inconsistent and erratic flashing patterns
- ⚠️ Hardware compatibility issues with older iPhone models
- 🐛 Strobe stops working after extended use

**Reported bugs**

- Strobe light cuts out every 2-3 seconds then resumes
- LED flashes erratically on certain iPhone models (iPhone 14, iPhone XS, iPhone SE)
- Strobe pulse is inconsistent and misses beats
- App crashes or stops working after 20-30 minutes
- Requires manual LED activation before starting strobe

**Requested features**

- Ability to adjust brightness while strobe is running
- Display accuracy specifications and hardware limitations
- Option to set frequency by Hz in addition to RPM
- Ability to specify number of fan blades for accurate RPM calculation
- 2x and 1/2x multiplier options


### 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 to OBJ, DAE, DXF, PLY | $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 Strobe Light Tachometer free?

Strobe Light Tachometer 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, Strobe Light Tachometer or STL Simple Viewer?

STL Simple Viewer is rated higher. Strobe Light Tachometer averages 4.2 out of 5 from 277 ratings, while STL Simple Viewer averages 4.3 from 866 ratings.

### Do Strobe Light Tachometer or STL Simple Viewer have ads?

STL Simple Viewer shows ads; Strobe Light Tachometer does not.

### Which is updated more often, Strobe Light Tachometer or STL Simple Viewer?

Strobe Light Tachometer ships an update every 7 months, and STL Simple Viewer every 20 months. Most recently, Strobe Light Tachometer was updated on September 22, 2026 and STL Simple Viewer on September 23, 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.*