# Live Spectrogram vs Audio Function Generator

The clearest difference is price: Audio Function Generator at Free against Live Spectrogram's $1.99. Audio Function Generator also leads on update cadence (every 6 weeks vs every 31 months) and ratings volume (2.2K vs 6). Live Spectrogram's advantage is in-app purchases (none vs 1) and chart position (#172 vs unranked). On rating, ads and device support there is nothing between them.

Audio Function Generator is free to download; Live Spectrogram costs $1.99 up front. Audio Function Generator sells 1 one-off in-app purchase. Live Spectrogram asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Live Spectrogram against 4.7 for Audio Function Generator. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 63% of Live Spectrogram's written reviews are positive against 77% of Audio Function Generator's.

Live Spectrogram ships an update every 31 months, Audio Function Generator every 6 weeks. The most recent releases landed on September 4, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Live Spectrogram | Audio Function Generator |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.8 (6 ratings)](https://appshunter.io/ios/app/live-spectrogram/id630831185/reviews)** | [4.7 (2.2K ratings)](https://appshunter.io/ios/app/audio-function-generator/id768229610/reviews) |
| Number of ratings | 6 | **2.2K** |
| Positive reviews | 62.5% of reviews | **77.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 31 months | **Every 6 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#172** | — |
| Size | 15 MB | 14 MB |
| Requires iOS | **13.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Krueger Systems, Inc.](https://appshunter.io/developer/299293363) | [Thomas Gruber](https://appshunter.io/developer/342699861) |

## What reviewers say

### Live Spectrogram

[App page](https://appshunter.io/ios/app/live-spectrogram/id630831185)

**Currently charting:** #172 Top Paid · Utilities (US App Store)

Visualize sound frequencies in real-time with this tool. It displays audio intensity across time and frequency using color, helping you perfect singing, analyze animal calls, or locate household noises.

**Highlights:** Real-time audio visualization, Frequency analysis, Time-based spectrum display, Intensity shown by color, Singing voice perfection, Animal call analysis, Sound source identification

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

**In-app purchases:** none


### Audio Function Generator

[App page](https://appshunter.io/ios/app/audio-function-generator/id768229610)

Generate various audio test tones, including sine, square, triangle, and sawtooth waves. Explore frequency and volume sweeps, noise generation, and custom preset creation. Advanced features like extended frequency ranges and multi-tone playback are available with an upgrade.

**Highlights:** Generate sine, square, triangle, and sawtooth tones, Frequency and volume sweep generation, Noise generation (white, pink, violet, etc.), Custom preset creation and saving, Extended frequency range (PRO feature), Multi-tone playback (PRO feature)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to PRO | $9.99 | one-time |

**What reviewers like**

- 👍 Great app
- 🎶 Helps with Tinnitus
- 💯 Best app I've paid for
- 🔍 Highly recommended
- 🎨 Attention to detail

**What reviewers complain about**

- 🐛 Crashes
- 💰 Deceptive/Money hungry
- 🔒 Basic features paywalled
- 🔒 Limited without paying
- 🔒 Removed functionality to push paid version

**Reported bugs**

- Crashes on launch
- Volume slider issues
- Airplay not working
- Sound distortion when display is active

**Requested features**

- Add download/save feature for custom sounds
- Improve sweep function (continuous mode, better frequency control)
- Add more multi-frequency rows
- Implement 432Hz base frequency option
- Add phase control for noise generators


## Frequently asked questions

### Is Live Spectrogram free?

Live Spectrogram costs $1.99, with no in-app purchases.

### Is Audio Function Generator free?

Audio Function Generator is free to download, with in-app purchases available.

### Which has better reviews, Live Spectrogram or Audio Function Generator?

Live Spectrogram is rated higher. Live Spectrogram averages 4.8 out of 5 from 6 ratings, while Audio Function Generator averages 4.7 from 2.2K ratings.

### Do Live Spectrogram or Audio Function Generator have ads?

Neither Live Spectrogram nor Audio Function Generator shows ads.

### Which is updated more often, Live Spectrogram or Audio Function Generator?

Live Spectrogram ships an update every 31 months, and Audio Function Generator every 6 weeks. Most recently, Live Spectrogram was updated on September 4, 2026 and Audio Function Generator on September 24, 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.*