# Audio Spectrum Analyzer Pro vs Feedback Trainer

The clearest difference is in-app purchases: Feedback Trainer at none against Audio Spectrum Analyzer Pro's 2. Feedback Trainer also leads on update cadence (every 2 weeks vs every 7 months). Audio Spectrum Analyzer Pro's advantage is ads (none vs shown) and iOS requirement (13.0 vs 16.6). On price 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. Feedback Trainer asks for nothing beyond the download.

Audio Spectrum Analyzer Pro ships an update every 7 months, Feedback Trainer every 2 weeks. The most recent releases landed on September 24, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Audio Spectrum Analyzer Pro | Feedback Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (238 ratings)](https://appshunter.io/ios/app/audio-spectrum-analyzer-pro/id1152352806/reviews)** | — |
| Number of ratings | **238** | — |
| Positive reviews | 57.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 40 MB | 4 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Vlad Polyanskiy](https://appshunter.io/developer/438646985) | [Shunsuke Takasu](https://appshunter.io/developer/6788974380) |

## 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


### Feedback Trainer

[App page](https://appshunter.io/ios/app/feedback-trainer/id6788974378)

**Features:** macOS Compatibility

**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 Feedback Trainer free?

Feedback Trainer is free to download, with no in-app purchases.

### Do Audio Spectrum Analyzer Pro or Feedback Trainer have ads?

Feedback Trainer shows ads; Audio Spectrum Analyzer Pro does not.

### Which is updated more often, Audio Spectrum Analyzer Pro or Feedback Trainer?

Audio Spectrum Analyzer Pro ships an update every 7 months, and Feedback Trainer every 2 weeks. Most recently, Audio Spectrum Analyzer Pro was updated on September 24, 2026 and Feedback Trainer on September 10, 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.*