# Audio Function Generator vs TrueEntropy

The clearest difference is in-app purchases: TrueEntropy at none against Audio Function Generator's 1. TrueEntropy also leads on iOS requirement (12.0 vs 15.5). Audio Function Generator's advantage is update cadence (every 6 weeks vs every 41 months) and ratings volume (2.2K vs 11). On price, ads and device support there is nothing between them.

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

Audio Function Generator holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 77% of Audio Function Generator's written reviews are positive against 67% of TrueEntropy's.

Audio Function Generator ships an update every 6 weeks, TrueEntropy every 41 months. The most recent releases landed on October 10, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Audio Function Generator | TrueEntropy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (2.2K ratings)](https://appshunter.io/ios/app/audio-function-generator/id768229610/reviews)** | [4.5 (11 ratings)](https://appshunter.io/ios/app/trueentropy/id1299321174/reviews) |
| Number of ratings | **2.2K** | 11 |
| Positive reviews | **77.1% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 41 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 14 MB | 10 MB |
| Requires iOS | 15.5 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [Vault12, Inc.](https://appshunter.io/developer/1073276506) |

## 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


### TrueEntropy

[App page](https://appshunter.io/ios/app/trueentropy/id1299321174)

This app leverages your smartphone's camera to produce genuine random numbers by capturing thermal noise. It generates a high volume of entropy, suitable for cryptographic purposes, and can output data locally or remotely.

**Highlights:** Generate true random numbers from thermal noise, Utilizes smartphone camera sensor, High volume entropy generation, Output binary files locally, Send entropy via cryptographic relays, Continuous generation mode

**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 TrueEntropy free?

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

### Which has better reviews, Audio Function Generator or TrueEntropy?

Audio Function Generator is rated higher. Audio Function Generator averages 4.7 out of 5 from 2.2K ratings, while TrueEntropy averages 4.5 from 11 ratings.

### Do Audio Function Generator or TrueEntropy have ads?

Neither Audio Function Generator nor TrueEntropy shows ads.

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

Audio Function Generator ships an update every 6 weeks, and TrueEntropy every 41 months. Most recently, Audio Function Generator was updated on October 10, 2026 and TrueEntropy on September 23, 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.*