# ModuleDesignTools vs Spectrum Analyzer+ Audio FFT

The clearest difference is ads: ModuleDesignTools at none against Spectrum Analyzer+ Audio FFT's shown. ModuleDesignTools also leads on device support (3 vs 1) and iOS requirement (12.0 vs 17.0). Spectrum Analyzer+ Audio FFT's advantage is update cadence (weekly vs monthly). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ModuleDesignTools ships an update monthly, Spectrum Analyzer+ Audio FFT weekly. The most recent releases landed on October 4, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | ModuleDesignTools | Spectrum Analyzer+ Audio FFT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.3 (3 ratings)](https://appshunter.io/ios/app/spectrum-analyzer-plus-audio-fft/id6760830858/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Weekly** |
| Monetization | — | Ad-supported |
| Size | 102 MB | 69 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [深圳炜煌打印机有限公司](https://appshunter.io/developer/1755521906) | [Kyu-Hee Jang](https://appshunter.io/developer/1587578867) |

## What reviewers say

### ModuleDesignTools

[App page](https://appshunter.io/ios/app/moduledesigntools/id6748936667)

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

**In-app purchases:** none


### Spectrum Analyzer+ Audio FFT

[App page](https://appshunter.io/ios/app/spectrum-analyzer-plus-audio-fft/id6760830858)

This utility transforms your device into a real-time audio frequency analyzer. It visualizes sound frequencies from 20 Hz to 20 kHz using the microphone, displaying amplitude and peak frequencies. It's designed for musicians, audio engineers, and sound enthusiasts.

**Highlights:** Real-time FFT audio spectrum visualization, Frequency range 20 Hz to 20 kHz, Peak frequency detection, Average dB level per band, Adjustable dB range, Dark theme

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

**In-app purchases:** none


## Frequently asked questions

### Is ModuleDesignTools free?

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

### Is Spectrum Analyzer+ Audio FFT free?

Spectrum Analyzer+ Audio FFT is free to download, with no in-app purchases.

### Do ModuleDesignTools or Spectrum Analyzer+ Audio FFT have ads?

Spectrum Analyzer+ Audio FFT shows ads; ModuleDesignTools does not.

### Which is updated more often, ModuleDesignTools or Spectrum Analyzer+ Audio FFT?

ModuleDesignTools ships an update monthly, and Spectrum Analyzer+ Audio FFT weekly. Most recently, ModuleDesignTools was updated on October 4, 2026 and Spectrum Analyzer+ Audio FFT on October 3, 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.*