# Audio Function Generator vs PhaseChecker

The clearest difference is review sentiment: Audio Function Generator at 77% against PhaseChecker's 16%. Audio Function Generator also leads on price (Free vs $0.99) and rating (4.7 vs 2.0). PhaseChecker's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Audio Function Generator is free to download; PhaseChecker costs $0.99 up front. Audio Function Generator sells 1 one-off in-app purchase. PhaseChecker asks for nothing beyond the download.

Audio Function Generator holds the better App Store score, 4.7 against 2.0. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 3, 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 16% of PhaseChecker's.

Audio Function Generator ships an update every 6 weeks, PhaseChecker every 43 months. The most recent releases landed on September 24, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Audio Function Generator | PhaseChecker |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.7 (2.2K ratings)](https://appshunter.io/ios/app/audio-function-generator/id768229610/reviews)** | [2.0 (3 ratings)](https://appshunter.io/ios/app/phasechecker/id1160400348/reviews) |
| Number of ratings | **2.2K** | 3 |
| Positive reviews | **77.1% of reviews** | 15.8% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 43 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 14 MB | 1 MB |
| Requires iOS | 15.5 | **14.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [Rick Peacock](https://appshunter.io/developer/286052385) |

## 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


### PhaseChecker

[App page](https://appshunter.io/ios/app/phasechecker/id1160400348)

This utility app tests your sound system to ensure speakers are correctly wired and in-phase. It offers manual and automatic modes, with advanced waveform analysis for precise setup. Proper phasing is crucial for optimal bass response and stereo imaging.

**Highlights:** Speaker phase and polarity testing, Manual and automatic test modes, Microphone-based analysis, Waveform view for advanced users, In-app help and guidance, Audio output connection

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

**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 PhaseChecker free?

PhaseChecker costs $0.99, with no in-app purchases.

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

Audio Function Generator is rated higher. Audio Function Generator averages 4.7 out of 5 from 2.2K ratings, while PhaseChecker averages 2.0 from 3 ratings.

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

Neither Audio Function Generator nor PhaseChecker shows ads.

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

Audio Function Generator ships an update every 6 weeks, and PhaseChecker every 43 months. Most recently, Audio Function Generator was updated on September 24, 2026 and PhaseChecker on September 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.*