# Audio Function Generator PRO vs HZP (Hertz Player)

The clearest difference is price: HZP (Hertz Player) at Free against Audio Function Generator PRO's $9.99. HZP (Hertz Player) also leads on update cadence (fortnightly vs every 6 weeks). Audio Function Generator PRO's advantage is rating (4.8 vs 3.9) and in-app purchases (none vs 6). On ratings volume, ads, device support and iOS requirement there is nothing between them.

HZP (Hertz Player) is free to download; Audio Function Generator PRO costs $9.99 up front. HZP (Hertz Player) sells 6 in-app purchases, starting at $2.99 per month. Audio Function Generator PRO asks for nothing beyond the download.

Audio Function Generator PRO holds the better App Store score, 4.8 against 3.9. Both are backed by a comparable volume of ratings — 269 and 111 respectively. Written reviews point the same way: 88% of Audio Function Generator PRO's written reviews are positive against 59% of HZP (Hertz Player)'s.

Audio Function Generator PRO ships an update every 6 weeks, HZP (Hertz Player) fortnightly. The most recent releases landed on October 13, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Audio Function Generator PRO | HZP (Hertz Player) |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.8 (269 ratings)](https://appshunter.io/ios/app/audio-function-generator-pro/id895074703/reviews)** | [3.9 (111 ratings)](https://appshunter.io/ios/app/hzp-hertz-player/id1671066429/reviews) |
| Number of ratings | **269** | 111 |
| Positive reviews | **87.9% of reviews** | 59.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | **#168** | — |
| Size | 13 MB | 95 MB |
| Requires iOS | **15.5** | 16.6 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Apple TV** |
| Age rating | 4+ | 12+ |
| Developer | [Thomas Gruber](https://appshunter.io/developer/342699861) | [SYQEL INC](https://appshunter.io/developer/1671066431) |

## What reviewers say

### Audio Function Generator PRO

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

**Currently charting:** #168 Top Paid · Music (US App Store)

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


### HZP (Hertz Player)

[App page](https://appshunter.io/ios/app/hzp-hertz-player/id1671066429)

Transform your existing music library by retuning any song to specific Solfeggio Frequencies or 432 Hz. Experience real-time audio transformation without downloads or complex setup, and explore a built-in library of healing soundscapes and visualizations.

**Highlights:** Retune songs to Solfeggio Frequencies or 432 Hz, Real-time audio frequency transformation, Built-in music library with meditations and nature sounds, SYQEL Audio Responsive Visualizer, Favorites playlist and bulk add to playlists, Sleep timer

**Features:** Family Sharing, Siri integration

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HZP Core - Monthly | $2.99 | per month |
| HZP Re:tune - Monthly | $9.99 | per month |
| HZP Amplify - Monthly | $19.99 | per month |
| HZP Core - Yearly | $29.99 | per year |
| HZP Re:tune - Yearly | $99.99 | per year |
| HZP Amplify - Yearly | $199.99 | per year |

**What reviewers like**

- 💡 Innovative frequency tuning
- 🎶 Great music experience
- ✨ Sleek design and UI
- 🧘‍♀️ Improves well-being
- 🎧 High-quality audio output

**What reviewers complain about**

- 💸 Deceptive subscription traps
- 💰 Price increases
- 🚫 Can't change frequency without pay
- ⚠️ Developer unresponsiveness
- 📉 Limited song access

**Reported bugs**

- App doesn't work
- Gets stuck in 'select music' section
- Continue button unresponsive
- Doesn't work at all after registration
- App is buggy

**Requested features**

- Add back Apple Music support
- Fix one song at a time playback with Apple Music
- Offline listening capability
- Improve UI and user-friendliness
- Add playlist saving


## Frequently asked questions

### Is Audio Function Generator PRO free?

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

### Is HZP (Hertz Player) free?

HZP (Hertz Player) is free to download, with in-app purchases available.

### Which has better reviews, Audio Function Generator PRO or HZP (Hertz Player)?

Audio Function Generator PRO is rated higher. Audio Function Generator PRO averages 4.8 out of 5 from 269 ratings, while HZP (Hertz Player) averages 3.9 from 111 ratings.

### Do Audio Function Generator PRO or HZP (Hertz Player) have ads?

Neither Audio Function Generator PRO nor HZP (Hertz Player) shows ads.

### Which is updated more often, Audio Function Generator PRO or HZP (Hertz Player)?

Audio Function Generator PRO ships an update every 6 weeks, and HZP (Hertz Player) fortnightly. Most recently, Audio Function Generator PRO was updated on October 13, 2026 and HZP (Hertz Player) on October 15, 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.*