# Audio Function Generator vs Energy Spark Tone Generator

The clearest difference is in-app purchases: Energy Spark Tone Generator at none against Audio Function Generator's 1. Energy Spark Tone Generator also leads on rating (5.0 vs 4.7). Audio Function Generator's advantage is ratings volume (2.2K vs 1) and device support. On price and iOS requirement there is nothing between them.

Both are free to download. Audio Function Generator sells 1 one-off in-app purchase. Energy Spark Tone Generator asks for nothing beyond the download.

Energy Spark Tone Generator holds the better App Store score, 5.0 against 4.7. 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.

## The numbers

| Metric | Audio Function Generator | Energy Spark Tone Generator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (2.2K ratings)](https://appshunter.io/ios/app/audio-function-generator/id768229610/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/energy-spark-tone-generator/id6450197369/reviews)** |
| Number of ratings | **2.2K** | 1 |
| Positive reviews | 77.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | Every 6 weeks | — |
| Monetization | Free with in-app purchases | **Free** |
| Size | 13 MB | 4 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | **iPhone, iPad** | — |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [Energy Spark Inc](https://appshunter.io/developer/1691781606) |

## 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 | $14.99 | 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


### Energy Spark Tone Generator

[App page](https://appshunter.io/ios/app/energy-spark-tone-generator/id6450197369)

This utility app generates single or multiple audio tones. It can be used with specific hardware to detect, ingest, and visualize sound frequencies.

**Highlights:** Single tone generation, Multiple tone generation, Compatibility with Energy Necklace™, Tone detection and visualization, Simple interface

**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 Energy Spark Tone Generator free?

Energy Spark Tone Generator is free to download, with no in-app purchases.

### Which has better reviews, Audio Function Generator or Energy Spark Tone Generator?

Energy Spark Tone Generator is rated higher. Audio Function Generator averages 4.7 out of 5 from 2.2K ratings, while Energy Spark Tone Generator averages 5.0 from 1 ratings.

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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.*