# iFunctionGenerator vs Audio Spectrum Viewer

The clearest difference is update cadence: iFunctionGenerator at every 12 months against Audio Spectrum Viewer's every 72 months. iFunctionGenerator also leads on iOS requirement (6.0 vs 16.6). Audio Spectrum Viewer's advantage is review sentiment (67% vs 53%) and price ($0.99 vs $2.99). On rating, ratings volume, ads and in-app purchases there is nothing between them.

iFunctionGenerator costs $2.99 and Audio Spectrum Viewer $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.4 for iFunctionGenerator against 4.3 for Audio Spectrum Viewer. Both are backed by a comparable volume of ratings — 9 and 4 respectively. Written reviews are what separate them: 53% of iFunctionGenerator's written reviews are positive against 67% of Audio Spectrum Viewer's.

iFunctionGenerator ships an update every 12 months, Audio Spectrum Viewer every 72 months. The most recent releases landed on October 31, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | iFunctionGenerator | Audio Spectrum Viewer |
| --- | --- | --- |
| Price | $2.99 | **$0.99** |
| Rating | **[4.4 (9 ratings)](https://appshunter.io/ios/app/ifunctiongenerator/id304851755/reviews)** | [4.3 (4 ratings)](https://appshunter.io/ios/app/audio-spectrum-viewer/id1525023447/reviews) |
| Number of ratings | **9** | 4 |
| Positive reviews | 53.3% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 12 months** | Every 72 months |
| Monetization | Paid | Paid |
| Size | 1 MB | 2 MB |
| Requires iOS | **6.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [Steve Glenner](https://appshunter.io/developer/1518671062) |

## What reviewers say

### iFunctionGenerator

[App page](https://appshunter.io/ios/app/ifunctiongenerator/id304851755)

This utility transforms your iOS device into a versatile audio function generator. Create up to 20 independent generators producing various waveforms and noise types, with precise control over frequency, volume, and phase for each channel. Save and recall your settings for quick access.

**Highlights:** Multiple waveform generation (sine, triangle, sawtooth, square), Pink and white noise generation, Up to 20 independent generators, Independent left/right channel volume control, Adjustable frequency from 1 to 20,000 Hz, Phase control, Save and load generator settings

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

**In-app purchases:** none


### Audio Spectrum Viewer

[App page](https://appshunter.io/ios/app/audio-spectrum-viewer/id1525023447)

Visualize the frequency content of your live audio environment with a dynamic waterfall spectrogram. Analyze sound systems, create audio fingerprints of environmental sounds, and save spectrograms with custom captions. Capture audio in the background for simultaneous recording and photography.

**Highlights:** Live audio frequency visualization, Waterfall/spectrogram display, Speaker and sound system analysis, Environmental sound fingerprinting, User-selectable gain and sample rate, Save spectrograms with captions, Save audio clips for playback

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

**In-app purchases:** none


## Frequently asked questions

### Is iFunctionGenerator free?

iFunctionGenerator costs $2.99, with no in-app purchases.

### Is Audio Spectrum Viewer free?

Audio Spectrum Viewer costs $0.99, with no in-app purchases.

### Which has better reviews, iFunctionGenerator or Audio Spectrum Viewer?

iFunctionGenerator is rated higher. iFunctionGenerator averages 4.4 out of 5 from 9 ratings, while Audio Spectrum Viewer averages 4.3 from 4 ratings.

### Do iFunctionGenerator or Audio Spectrum Viewer have ads?

Neither iFunctionGenerator nor Audio Spectrum Viewer shows ads.

### Which is updated more often, iFunctionGenerator or Audio Spectrum Viewer?

iFunctionGenerator ships an update every 12 months, and Audio Spectrum Viewer every 72 months. Most recently, iFunctionGenerator was updated on October 31, 2026 and Audio Spectrum Viewer on October 30, 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.*