# Audio Function Generator vs Spectrum Compact Simulator

The clearest difference is rating: Audio Function Generator at 4.7 against Spectrum Compact Simulator's 1.0. Audio Function Generator also leads on ratings volume (2.2K vs 1). Spectrum Compact Simulator's advantage is in-app purchases (none vs 1) and iOS requirement (7.1 vs 15.5). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Audio Function Generator sells 1 one-off in-app purchase. Spectrum Compact Simulator asks for nothing beyond the download.

Audio Function Generator holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 1, so its average is the more settled of the two.

Audio Function Generator ships an update every 6 weeks, Spectrum Compact Simulator every 2 months. The most recent releases landed on October 5, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Audio Function Generator | Spectrum Compact Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (2.2K ratings)](https://appshunter.io/ios/app/audio-function-generator/id768229610/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/spectrum-compact-simulator/id910904261/reviews) |
| Number of ratings | **2.2K** | 1 |
| Positive reviews | 77.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 14 MB | 1 MB |
| Requires iOS | 15.5 | **7.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [SAF Tehnika AS](https://appshunter.io/developer/514563603) |

## What reviewers say

### 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


### Spectrum Compact Simulator

[App page](https://appshunter.io/ios/app/spectrum-compact-simulator/id910904261)

Explore the functionality of a handheld microwave spectrum analyzer through a realistic simulation. This application demonstrates how to perform antenna alignment, troubleshooting, and maintenance with ease and speed.

**Highlights:** Simulates handheld microwave spectrum analyzer, Demonstrates real microwave radio spectrum data, Facilitates antenna alignment, Aids in troubleshooting, Supports maintenance tasks

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Audio Function Generator free?

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

### Is Spectrum Compact Simulator free?

Spectrum Compact Simulator is free to download, with no in-app purchases.

### Which has better reviews, Audio Function Generator or Spectrum Compact Simulator?

Audio Function Generator is rated higher. Audio Function Generator averages 4.7 out of 5 from 2.2K ratings, while Spectrum Compact Simulator averages 1.0 from 1 ratings.

### Do Audio Function Generator or Spectrum Compact Simulator have ads?

Neither Audio Function Generator nor Spectrum Compact Simulator shows ads.

### Which is updated more often, Audio Function Generator or Spectrum Compact Simulator?

Audio Function Generator ships an update every 6 weeks, and Spectrum Compact Simulator every 2 months. Most recently, Audio Function Generator was updated on October 5, 2026 and Spectrum Compact Simulator on September 18, 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.*