# Audio Function Generator PRO vs Sonic | Water Eject

The clearest difference is price: Sonic | Water Eject at Free against Audio Function Generator PRO's $9.99. Sonic | Water Eject also leads on ratings volume (21K vs 269) and update cadence (every 2 weeks vs every 6 weeks). Audio Function Generator PRO's advantage is in-app purchases (none vs 9) and ads (none vs shown). On rating, review sentiment and device support there is nothing between them.

Sonic | Water Eject is free to download; Audio Function Generator PRO costs $9.99 up front. Sonic | Water Eject sells 9 in-app purchases, starting at $1.99 per 7 days. Audio Function Generator PRO asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Audio Function Generator PRO against 4.7 for Sonic | Water Eject. That said, the two scores are not equally well evidenced: Sonic | Water Eject has 21K ratings behind it against 269, so its average is the more settled of the two. Written reviews are what separate them: 88% of Audio Function Generator PRO's written reviews are positive against 81% of Sonic | Water Eject's.

Audio Function Generator PRO ships an update every 6 weeks, Sonic | Water Eject every 2 weeks. The most recent releases landed on September 21, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Audio Function Generator PRO | Sonic | Water Eject |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.8 (269 ratings)](https://appshunter.io/ios/app/audio-function-generator-pro/id895074703/reviews)** | [4.7 (21K ratings)](https://appshunter.io/ios/app/sonic-water-eject/id986999895/reviews) |
| Number of ratings | 269 | **21K** |
| Positive reviews | **87.9% of reviews** | 81.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | **Free** | Freemium |
| Best chart rank | — | **#183** |
| Size | 13 MB | 50 MB |
| Requires iOS | **15.5** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [VonBruno LLC](https://appshunter.io/developer/346742389) |

## What reviewers say

### Audio Function Generator PRO

[App page](https://appshunter.io/ios/app/audio-function-generator-pro/id895074703)

Generate various audio test tones, including sine, square, and sawtooth waves. Explore frequency and volume sweeps, custom presets, and different types of noise. Advanced settings allow for fine-tuning signal parameters and creating complex multi-tone sequences.

**Highlights:** Generate sine, square, triangular, and sawtooth tones, Frequency and volume sweep generation, Customizable presets and configurations, Multiple noise types (White, Pink, Violet, etc.), Advanced signal parameter control, Multi-tone and dual function generation

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

**In-app purchases:** none

**What reviewers like**

- ✨ Superb craftsmanship and work
- 🚀 Excellent performance on older devices
- 💡 History feature is a great addition
- 👍 Versatile and powerful app
- 🎶 Great for binaural beats and sound creation

**What reviewers complain about**

- 📉 Linear sweep is useless
- ❓ Missing PWM functionality
- ❓ Missing Terzrauschen (third-octave noise)
- 🐛 Volume button issues
- 🐛 GUI is bad

**Reported bugs**

- Volume button issues (jumps up and down, displays wrong level)
- Update crashes on iPad Air2 when changing screens
- App opens AppStore repeatedly after purchase
- Buttons don't respond, settings don't keep
- Frequencies stick, program is useless

**Requested features**

- Logarithmic sweeps and frequency slider scale
- PWM functionality
- Terzrauschen (third-octave noise)
- Ping-pong sweeps in Multitone windows
- Sweeping of noise/adding noise in Multitone sweep with sweeping bandpass filter


### Sonic | Water Eject

[App page](https://appshunter.io/ios/app/sonic-water-eject/id986999895)

**Currently charting:** #183 Top Free · Music (US App Store)

This app generates precise sine wave tones to help remove water and debris from your device's speakers. Easily adjust frequencies by swiping on the screen, and enjoy features like Apple Watch control and background operation. Premium subscribers gain access to advanced waveforms, unlimited sessions, and an ad-free experience.

**Highlights:** Clears moisture from device speakers, Generates tones from 0 Hz to 25 kHz, Control via Apple Watch, Background operation, Broadcast to Bluetooth/Airplay speakers, Unique waveforms (Premium)

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Monthly | $2.99 | per month |
| Weekly | $2.99 | per 7 days |
| Annual | $9.99 | per year |
| Annual | $29.99 | per year |
| Sonic Clean | $0.99 | one-time |
| Sonic Presets | $2.99 | one-time |
| Sonic Waveforms | $2.99 | one-time |
| Lifetime | $24.99 | one-time |

**What reviewers like**

- 🚀 Works great for water ejection
- 🔧 Effectively removes water from speakers
- 👍 Saved phones from water damage
- 💡 Useful for tuning instruments and sound healing

**What reviewers complain about**

- 🔒 Premium features now behind paywall
- 💰 Subscription model too expensive
- 🔇 Ads interfere with usability
- 🐛 Frequency controls not user-friendly

**Reported bugs**

- Frequency controls fixed at 530Hz in some versions
- Close button not responsive in some cases

**Requested features**

- Add volume control to play in background
- Provide manual frequency input option
- Implement binaural beat feature


## Frequently asked questions

### Is Audio Function Generator PRO free?

Audio Function Generator PRO costs $9.99, with no in-app purchases.

### Is Sonic | Water Eject free?

Sonic | Water Eject is free to download, with in-app purchases available.

### Which has better reviews, Audio Function Generator PRO or Sonic | Water Eject?

Audio Function Generator PRO is rated higher. Audio Function Generator PRO averages 4.8 out of 5 from 269 ratings, while Sonic | Water Eject averages 4.7 from 21K ratings.

### Do Audio Function Generator PRO or Sonic | Water Eject have ads?

Sonic | Water Eject shows ads; Audio Function Generator PRO does not.

### Which is updated more often, Audio Function Generator PRO or Sonic | Water Eject?

Audio Function Generator PRO ships an update every 6 weeks, and Sonic | Water Eject every 2 weeks. Most recently, Audio Function Generator PRO was updated on September 21, 2026 and Sonic | Water Eject 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.*