# STETSOM STX2436 vs Audio Spectrum Analyzer Pro

The clearest difference is review sentiment: Audio Spectrum Analyzer Pro at 57% against STETSOM STX2436's 13%. Audio Spectrum Analyzer Pro also leads on rating (4.4 vs 2.0) and ratings volume (239 vs 1). STETSOM STX2436's advantage is in-app purchases (none vs 2) and iOS requirement (9.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. Audio Spectrum Analyzer Pro sells 2 in-app purchases, starting at $19.99 per year. STETSOM STX2436 asks for nothing beyond the download.

Audio Spectrum Analyzer Pro holds the better App Store score, 4.4 against 2.0. That said, the two scores are not equally well evidenced: Audio Spectrum Analyzer Pro has 239 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 13% of STETSOM STX2436's written reviews are positive against 57% of Audio Spectrum Analyzer Pro's.

STETSOM STX2436 ships an update every 24 months, Audio Spectrum Analyzer Pro every 7 months. The most recent releases landed on October 26, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | STETSOM STX2436 | Audio Spectrum Analyzer Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/stetsom-stx2436/id1111288357/reviews) | **[4.4 (239 ratings)](https://appshunter.io/ios/app/audio-spectrum-analyzer-pro/id1152352806/reviews)** |
| Number of ratings | 1 | **239** |
| Positive reviews | 12.8% of reviews | **57.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 7 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 39 MB | 40 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [STETSOM ELETRÔNICA LTDA](https://appshunter.io/developer/1110480569) | [Vlad Polyanskiy](https://appshunter.io/developer/438646985) |

## What reviewers say

### STETSOM STX2436

[App page](https://appshunter.io/ios/app/stetsom-stx2436/id1111288357)

This application allows users to control the STETSOM STX2436 Audio Processor. It offers a demonstration mode to test its functionality even without the physical hardware.

**Highlights:** Control STETSOM STX2436 Audio Processor, Demonstration mode for testing, Activate demo mode via settings, Side menu access

**Features:** Vision Pro support

**In-app purchases:** none


### Audio Spectrum Analyzer Pro

[App page](https://appshunter.io/ios/app/audio-spectrum-analyzer-pro/id1152352806)

Analyze sound frequencies in real-time with this powerful tool. It offers detailed octave band analysis, FFT plots, and various measurement scales. Supports multiple microphones and noise analysis features for accurate audio insights.

**Highlights:** Octave Band Real Time Analyzer, FFT Plot (Fast Fourier Transform), Sound level meter (dB meter), Noise Rating and Noise Criterion support, Support for external microphones, Pre-calibrated mic profiles

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Mode | $19.99 | per year |
| Premium Pack | $29.99 | one-time |

**What reviewers like**

- 👍 Intuitive and easy-to-use interface
- 💰 Completely free with no ads
- 🎯 Accurate frequency and spectrum analysis
- 📊 Multiple visualization modes (FFT, spectrograph, bar display)
- 🔧 Professional-grade audio measurement tool

**What reviewers complain about**

- 💸 Aggressive subscription/paywall nags
- 🔄 Frequent iOS compatibility issues after updates
- 📉 Features moved behind paywall in recent updates
- 🐛 App crashes on startup (especially iOS 16/26)
- ⚠️ Misleading free trial that requires payment

**Reported bugs**

- App crashes on iOS 16 and iOS 26 launches
- FFT resolution not working after iOS updates
- Graph display freezes or becomes unresponsive
- Spectrograph mode too slow on newer iPhones
- Frequency alignment issues with dynamic display

**Requested features**

- Audio file upload capability
- White noise/test signal generator
- Microphone calibration file support
- Recording functionality with timestamp
- Multiple frequency cursors for comparison


## Frequently asked questions

### Is STETSOM STX2436 free?

STETSOM STX2436 is free to download, with no in-app purchases.

### Is Audio Spectrum Analyzer Pro free?

Audio Spectrum Analyzer Pro is free to download, with in-app purchases available.

### Which has better reviews, STETSOM STX2436 or Audio Spectrum Analyzer Pro?

Audio Spectrum Analyzer Pro is rated higher. STETSOM STX2436 averages 2.0 out of 5 from 1 ratings, while Audio Spectrum Analyzer Pro averages 4.4 from 239 ratings.

### Do STETSOM STX2436 or Audio Spectrum Analyzer Pro have ads?

Neither STETSOM STX2436 nor Audio Spectrum Analyzer Pro shows ads.

### Which is updated more often, STETSOM STX2436 or Audio Spectrum Analyzer Pro?

STETSOM STX2436 ships an update every 24 months, and Audio Spectrum Analyzer Pro every 7 months. Most recently, STETSOM STX2436 was updated on October 26, 2026 and Audio Spectrum Analyzer Pro on November 2, 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.*