# Ultrasonic Repeller vs Audio Function Generator

The clearest difference is price: Audio Function Generator at Free against Ultrasonic Repeller's $0.59. Audio Function Generator also leads on rating (4.7 vs 3.6) and review sentiment (77% vs 44%). Ultrasonic Repeller's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

Audio Function Generator is free to download; Ultrasonic Repeller costs $0.59 up front. Audio Function Generator sells 1 one-off in-app purchase. Ultrasonic Repeller asks for nothing beyond the download.

Audio Function Generator holds the better App Store score, 4.7 against 3.6. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 51, so its average is the more settled of the two. Written reviews point the same way: 44% of Ultrasonic Repeller's written reviews are positive against 77% of Audio Function Generator's.

Ultrasonic Repeller ships an update every 2 months, Audio Function Generator every 6 weeks. The most recent releases landed on October 18, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Ultrasonic Repeller | Audio Function Generator |
| --- | --- | --- |
| Price | $0.59 | **Free** |
| Rating | [3.6 (51 ratings)](https://appshunter.io/ios/app/ultrasonic-repeller/id445318668/reviews) | **[4.7 (2.2K ratings)](https://appshunter.io/ios/app/audio-function-generator/id768229610/reviews)** |
| Number of ratings | 51 | **2.2K** |
| Positive reviews | 43.6% of reviews | **77.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 13 MB |
| Requires iOS | 16.1 | **16.0** |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandr Balyberdin](https://appshunter.io/developer/336185043) | [Thomas Gruber](https://appshunter.io/developer/342699861) |

## What reviewers say

### Ultrasonic Repeller

[App page](https://appshunter.io/ios/app/ultrasonic-repeller/id445318668)

This app uses ultrasound technology to create a protective barrier against insects, rodents, and aggressive dogs. It also offers features for personal space and experimental bat deterrence, with advanced controls and Apple Watch integration.

**Highlights:** Insect repellent, Rodent deterrent, Dog deterrent, Personal space protector, Apple Watch support, High-precision frequency generator, Background mode

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- ✅ Effective on mosquitoes and insects
- ✅ Works on rodents when volume is high
- ✅ Free app with no cost
- ✅ Simple and intuitive interface
- ✅ Multiple pest settings available

**What reviewers complain about**

- ❌ Inconsistent effectiveness across different pests
- ❌ Doesn't work on dogs or older animals
- ❌ Requires high volume to be effective
- ❌ Limited range of effectiveness
- ❌ Effectiveness diminishes over time as pests adapt

**Reported bugs**

- App crashes on startup (multiple iOS versions)
- Incompatible with iOS 8 and older versions
- App force closes when screen is locked
- Crashes on iPhone 6s and later models
- No sound output on iPad 1

**Requested features**

- Add cat repeller mode
- Add bat repeller mode
- Add ant repeller mode
- Add fly repeller mode
- Add snake repeller mode


### 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 Ultrasonic Repeller free?

Ultrasonic Repeller costs $0.59, 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, Ultrasonic Repeller or Audio Function Generator?

Audio Function Generator is rated higher. Ultrasonic Repeller averages 3.6 out of 5 from 51 ratings, while Audio Function Generator averages 4.7 from 2.2K ratings.

### Do Ultrasonic Repeller or Audio Function Generator have ads?

Neither Ultrasonic Repeller nor Audio Function Generator shows ads.

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

Ultrasonic Repeller ships an update every 2 months, and Audio Function Generator every 6 weeks. Most recently, Ultrasonic Repeller was updated on October 18, 2026 and Audio Function Generator on October 17, 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.*