# Audio Spectrum Analyzer Pro vs STETSOM STX DSP

The clearest difference is in-app purchases: STETSOM STX DSP at none against Audio Spectrum Analyzer Pro's 2. STETSOM STX DSP also leads on update cadence (every 8 days vs every 7 months) and rating (4.6 vs 4.4). Audio Spectrum Analyzer Pro's advantage is review sentiment (57% vs 39%) and iOS requirement (13.0 vs 15.0). On price, ratings volume, 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 STX DSP asks for nothing beyond the download.

STETSOM STX DSP holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 239 and 435 respectively. Written reviews complicate that: 57% of Audio Spectrum Analyzer Pro's written reviews are positive against 39% of STETSOM STX DSP's, so the app with the better star average is not the one people write more warmly about.

Audio Spectrum Analyzer Pro ships an update every 7 months, STETSOM STX DSP every 8 days. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Audio Spectrum Analyzer Pro | STETSOM STX DSP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (239 ratings)](https://appshunter.io/ios/app/audio-spectrum-analyzer-pro/id1152352806/reviews) | **[4.6 (435 ratings)](https://appshunter.io/ios/app/stetsom-stx-dsp/id1615834724/reviews)** |
| Number of ratings | 239 | **435** |
| Positive reviews | **57.4% of reviews** | 39.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 8 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 40 MB | 72 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Vlad Polyanskiy](https://appshunter.io/developer/438646985) | [STETSOM ELETRÔNICA LTDA](https://appshunter.io/developer/1110480569) |

## What reviewers say

### 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


### STETSOM STX DSP

[App page](https://appshunter.io/ios/app/stetsom-stx-dsp/id1615834724)

Control your Stetsom audio system directly from your smartphone. Adjust your automotive sound system in real-time and monitor technical information with this app. Explore features in demo mode if you don't own a compatible processor.

**Highlights:** Real-time audio system adjustment, Monitor technical information, Bluetooth communication, Control compatible digital processors, Demo mode for exploration

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Audio Spectrum Analyzer Pro free?

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

### Is STETSOM STX DSP free?

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

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

STETSOM STX DSP is rated higher. Audio Spectrum Analyzer Pro averages 4.4 out of 5 from 239 ratings, while STETSOM STX DSP averages 4.6 from 435 ratings.

### Do Audio Spectrum Analyzer Pro or STETSOM STX DSP have ads?

Neither Audio Spectrum Analyzer Pro nor STETSOM STX DSP shows ads.

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

Audio Spectrum Analyzer Pro ships an update every 7 months, and STETSOM STX DSP every 8 days. Most recently, Audio Spectrum Analyzer Pro was updated on November 6, 2026 and STETSOM STX DSP 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.*