Comparison

Audio Function Generator PRO vs HZP (Hertz Player)

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Audio Function Generator PRO

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
Currently charting
Read full description

This is the highly recommended and praised Function Generator App - an amazingly great and powerful tone generator. Enriched with a vast amount of features yet it is extremely intuitive and designed for simplicity. Get to know this great App now! It is very well maintained and has received considerable upgrades over the past years. So, … what can you do with this App? • PLAY TEST TONES Sine, Rectangular, Triangular and Sawtooth. • PLAY FREQUENCY SWEEP TEST TONES in both directions (minimum to maximum frequency and maximum to minimum frequency). • PLAY VOLUME SWEEPS (from minimum to maximum volume). • Try the SWEEP REPEAT / WOBBLE function. • Try the MUSIC TONES PLAYBACK. • Experiment with the huge FINE TUNE SELECTON, PRESETS SELECTION! • Or create your own CUSTOM PRESETS! • And SAVE an endless amount of CONFIGURATIONS (Frequency, Sweep, Noise) for later quick access and direct playback function. • Even play back different kinds of NOISE – White, Pink, Violet, Grey, Brown, Blue is also supported. The Function Generator is AMAZINGLY INTUITIVE and SIMPLE! AND THESE ARE THE ADVANCED SETTINGS/FEATURES: => Extending The Frequency Range (1Hz - 21kHz) => Extending The Sweep Times (0.1s - 600s) => Changing Min/Max Slider Frequency Ranges => Changing Max Sweep Time Slider Range => Changing Signal Amplitude => Enabling Of The Sweep Repeat / Wobble Function => Frequency Slider Setting to Linear or Logarithmic => Left/Right Channel Individual Selection => Permanently Saving Custom Presets => Saving Of Endless Number Of Audio Configurations => Phase Out Setting (custom phase shift of the generated signal) => BPM (Beats per Minute) Feature => Dual Function Generator => MultiTone Generator (playback of up to eight individual tones) => Background Theme Selection (Light/Dark) Check out the new Tutorial page: www.ee-toolkit.com/audio-function-generator

About

HZP (Hertz Player)

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
Read full description

Re-tune the music you already love to 432 Hz and the Solfeggio frequencies — in real time, in one tap. Trusted by over 25,000 sound, energy & frequency enthusiasts worldwide. You already choose the quality of the food you eat, the water you drink, and the air you breathe. Now you can choose the quality of the audio frequencies your mind, body & soul absorb every day. Imagine your entire music collection re-tuned to any Solfeggio Frequency or the "magical earth tone," 432 Hz — at the click of a button. HZP infuses the music you already listen to with the sound and feel of the 432 Hz and Solfeggio world, instantly. + Save thousands of hours converting music files + Save hundreds of dollars re-buying tracks + Enjoy unlimited real-time frequency re-tuning + No duplicate files or hard-drive clutter + Works on your iPhone, Mac, CarPlay & Apple TV + No technical skills required — zero learning curve Re-tune any song to any Solfeggio Frequency and 432 Hz with no downloading, sorting, or converting. Just press play. — WHAT LISTENERS LOVE IT FOR — + Winding down and relaxing + Setting the mood for meditation & yoga + Getting in the zone for focus & creativity + Creating a calm, unwinding atmosphere at home + Supporting a personal sound & energy practice + Raising your vibration + Elevating everyday listening — CONNECT TO YOUR APPLE MUSIC ACCOUNT — + Automatically import all of the music you own + Enjoy Apple Music playlists — FREE AUDIUS MUSIC CATALOG INCLUDED — + Pure-tone Solfeggio frequencies + Hours of guided meditations + Hour-long DJ sets for workouts & parties + Relaxation, study & focus music + White noise, ASMR & background sound + Nature sounds: rain, waterfalls, birdsong, crackling fire & more — AUDIO-RESPONSIVE MUSIC VISUALIZER — Pick your music, set your frequency, and watch it come to life. + Experience your music in a whole new audio-visual way + Mesmerizes kids and adults alike + A hit with friends — fills the room with delight + "Turns any song into an animated music video!" — MADE FOR THE WAY YOU LISTEN — + Favorites: tap the heart to save any song and find it again fast + Bulk playlists: build lists from entire folders and artists in seconds + Sleep timer: set a countdown and let the music stop on its own + Sort by duration: instantly find long, uninterrupted tracks and DJ sets for hikes, workouts, meditation and more + Share: send friends and fans a track in the exact frequency you love — visualizer included "HZP is a revolution in music technology!" Download HZP and start hearing your music at 432 Hz and the Solfeggio frequencies today. HZP is a music player for entertainment and relaxation. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any condition. Frequency and sound-healing experiences are subjective and vary from person to person. Terms of service: https://hzp.co/terms/ Privacy policy: https://hzp.co/privacy/

Screenshots

Audio Function Generator PRO4 screens
HZP (Hertz Player)4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 4 level
Audio Function Generator PRO versus HZP (Hertz Player): the parameters behind the verdict, then further details
ParameterAudio Function Generator PROHZP (Hertz Player)
Price$9.99Free — better
Rating4.8 (269 ratings) — better3.9 (111 ratings)
Positive reviews87.9% of reviews — better59.0% of reviews
Number of ratings269 — better111
Update frequencyEvery 6 weeksFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank#144 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac, Apple TV — better
Requires iOS15.5 — better16.6
Further details — not scored
Size13 MB95 MB
Age rating4+12+
DeveloperThomas GruberSYQEL INC

Customer experience

Audio Function Generator PRO

All ratings269 ratings
Positive94.8%
Neutral2.6%
Negative2.6%
Written reviews58 reviews
Positive87.9%
Neutral5.2%
Negative6.9%

HZP (Hertz Player)

All ratings111 ratings
Positive68.5%
Neutral10.8%
Negative20.7%
Written reviews39 reviews
Positive59.0%
Neutral15.4%
Negative25.6%

User reviews

Audio Function Generator PRO

From 269 App Store ratings

What we love

  • ✨ 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

Room to improve

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

HZP (Hertz Player)

From 111 App Store ratings

What we love

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

Room to improve

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

Bugs and requests

Audio Function Generator PRO

Reported bugs

6 issues
  • 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
Show 1 more
  • App stops too much

Requested features

19 requests
  • 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
Show 14 more
  • Audio plugin (AU, AAX, VST)
  • Responsiveness for MacBook use
  • Simultaneous recording of generated signals
  • Panning function for tones and sweeps
  • Ability to save Multitone configurations
  • Phase shift functionality
  • Higher frequency range (up to 24kHz)
  • Dual mode sweep function
  • Taper function
  • Extended time for sweeps (6-8 hours)
  • Ability to stay at selected frequency for several minutes
  • Spectrum analyzer
  • Separate control for left and right channels
  • 8-hour program for sleep entrainment

HZP (Hertz Player)

Reported bugs

14 issues
  • App doesn't work
  • Gets stuck in 'select music' section
  • Continue button unresponsive
  • Doesn't work at all after registration
  • App is buggy
Show 9 more
  • Crashes
  • Doesn't play music
  • Unable to retrieve songs from library
  • Freezes
  • Consistently crashing
  • Not playing many songs
  • App crashes immediately when choosing a song
  • App crashes when trying to play a song
  • Updates are finicky

Requested features

6 requests
  • 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
Show 1 more
  • Add play all/shuffle from playlist functionality

In-app purchases

None

Audio Function Generator PRO

No in-app purchases

6 purchases

HZP (Hertz Player)

Subscriptions6
  • HZP Core - Monthly$2.991 Month
  • HZP Re:tune - Monthly$9.991 Month
  • HZP Amplify - Monthly$19.991 Month
Show 3 more
  • HZP Core - Yearly$29.991 Year
  • HZP Re:tune - Yearly$99.991 Year
  • HZP Amplify - Yearly$199.991 Year

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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