# Audio spectrum analyzer EQ Rta vs STL Simple Viewer

The clearest difference is price: STL Simple Viewer at Free against Audio spectrum analyzer EQ Rta's $3.99. STL Simple Viewer also leads on ratings volume (923 vs 245). Audio spectrum analyzer EQ Rta's advantage is review sentiment (56% vs 18%) and in-app purchases (none vs 4). On device support there is nothing between them.

STL Simple Viewer is free to download; Audio spectrum analyzer EQ Rta costs $3.99 up front. STL Simple Viewer sells 4 in-app purchases, starting at $0.99 per 7 days. Audio spectrum analyzer EQ Rta asks for nothing beyond the download.

Audio spectrum analyzer EQ Rta holds the better App Store score, 4.5 against 4.3. Both are backed by a comparable volume of ratings — 245 and 923 respectively. Written reviews point the same way: 56% of Audio spectrum analyzer EQ Rta's written reviews are positive against 18% of STL Simple Viewer's.

Audio spectrum analyzer EQ Rta ships an update every 2 months, STL Simple Viewer every 5 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Audio spectrum analyzer EQ Rta | STL Simple Viewer |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.5 (245 ratings)](https://appshunter.io/ios/app/audio-spectrum-analyzer-eq-rta/id1122398778/reviews)** | [4.3 (923 ratings)](https://appshunter.io/ios/app/stl-simple-viewer/id1493598400/reviews) |
| Number of ratings | 245 | **923** |
| Positive reviews | **56.3% of reviews** | 18.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 18 MB | 19 MB |
| Requires iOS | **11.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Marina Polyanskaya](https://appshunter.io/developer/1519482916) | [Victor Bovio](https://appshunter.io/developer/327627515) |

## What reviewers say

### Audio spectrum analyzer EQ Rta

[App page](https://appshunter.io/ios/app/audio-spectrum-analyzer-eq-rta/id1122398778)

This app provides real-time audio analysis and visualization for sound frequency and decibel levels. It's designed for precise audio measurement, suitable for both hobbyists and professionals tuning rooms or speakers.

**Highlights:** Octave Band Real-Time Analyzer, FFT Plot, Smooth HD Graphics, Multispectral Harmonic Analyzer, Integrated Sound Level Meter, High FFT Size, Spectrogram Mode

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Well-designed interface
- 👍 Useful for musicians
- 👍 Good for casual use
- 👍 Accurate for basic analysis
- 👍 Replaces expensive equipment

**What reviewers complain about**

- 🐛 Does not work on newer iOS
- 🐛 Freezes frequently
- 🐛 Unresponsive graphs
- 🐛 No instructions
- 🐛 Help section shows errors

**Reported bugs**

- Does not work with iPad Pro M4 and iOS 18
- Freezes all the time on newer iOS versions
- Does not respond correctly on newer iOS
- Does not work on iPhone 11
- HELP in app doesn't work, showing ERROR

**Requested features**

- Fix for newer iOS versions
- Add instructions
- Fix help section
- Add refund option
- Add zoom function


### 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 Audio spectrum analyzer EQ Rta free?

Audio spectrum analyzer EQ Rta costs $3.99, 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, Audio spectrum analyzer EQ Rta or STL Simple Viewer?

Audio spectrum analyzer EQ Rta is rated higher. Audio spectrum analyzer EQ Rta averages 4.5 out of 5 from 245 ratings, while STL Simple Viewer averages 4.3 from 923 ratings.

### Do Audio spectrum analyzer EQ Rta or STL Simple Viewer have ads?

STL Simple Viewer shows ads; Audio spectrum analyzer EQ Rta does not.

### Which is updated more often, Audio spectrum analyzer EQ Rta or STL Simple Viewer?

Audio spectrum analyzer EQ Rta ships an update every 2 months, and STL Simple Viewer every 5 months. Most recently, Audio spectrum analyzer EQ Rta was updated on November 6, 2026 and STL Simple Viewer on November 7, 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.*