Comparison

Audio Function Generator PRO vs Tone Generator EM

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

Tone Generator EM

Generate sounds across a wide frequency range to test hearing, tune instruments, or experiment with audio. Easily select frequencies with a slider, adjust volume, and play tones.

Highlights
  • Generate sounds from 1Hz to 22kHz
  • Test hearing and audio equipment
  • Tune musical instruments
  • Intuitive frequency slider
  • Adjust volume
  • Note list with corresponding frequencies
Features
Read full description

Tone Generator is a free frequency sound generator app that allows you to generate sounds in different frequencies from the lowest to the highest ranges, from 1Hz to 22kHz. Using this free frequency generator app, you can test your hearing, test audio equipment, tune different instruments, perform audio experiments, and much more. Download Tone Generator for free on your device, utilize the slider to choose the specific frequency, adjust the volume, and hit the Play button. Tone Generator main features: • Clean and neat design with a fresh and intuitive interface • Advanced yet easy-to-use frequency generator app • Change frequency slider range from the lowest to the highest • Pick up a note from the note list with corresponding frequency • Adjust audio frequency and device’s volume So, if you are a musician and are looking for a free frequency sound generator to tune musical instruments and test audio equipment, you’ve come to the right place. This free tone generator app has got you covered when it comes to testing your hearing. Stay tuned and let us know about any bugs, questions, feature requests, or any other suggestions.

Screenshots

Audio Function Generator PRO4 screens
Tone Generator EM4 screens

Verdict

The call

The clearest difference is review sentiment: Audio Function Generator PRO at 88% against Tone Generator EM's 0%. Audio Function Generator PRO also leads on in-app purchases (none vs 1) and ads (none vs shown). Tone Generator EM's advantage is price (Free vs $9.99) and iOS requirement (13.0 vs 15.5). On update cadence and device support 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

Tone Generator EM is free to download; Audio Function Generator PRO costs $9.99 up front. Tone Generator EM sells 1 one-off in-app purchase. 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 4.4. That said, the two scores are not equally well evidenced: Audio Function Generator PRO has 269 ratings behind it against 36, so its average is the more settled of the two. Written reviews point the same way: 88% of Audio Function Generator PRO's written reviews are positive against 0% of Tone Generator EM's.

UpkeepUpdate frequency

Audio Function Generator PRO ships an update every 6 weeks, Tone Generator EM every 2 months. The most recent releases landed on September 25, 2026 and August 25, 2026 respectively.

Scorecard9 real differences · 2 level
Audio Function Generator PRO versus Tone Generator EM: the parameters behind the verdict, then further details
ParameterAudio Function Generator PROTone Generator EM
Price$9.99Free — better
Rating4.8 (269 ratings) — better4.4 (36 ratings)
Positive reviews87.9% of reviews — better0.0% of reviews
Number of ratings269 — better36
Update frequencyEvery 6 weeks — betterEvery 2 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank#196 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.513.0 — better
Further details — not scored
Size13 MB6 MB
Age rating4+4+
DeveloperThomas GrubermyrApps

Customer experience

Audio Function Generator PRO

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

Tone Generator EM

All ratings36 ratings
Positive86.1%
Neutral2.8%
Negative11.1%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

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

Tone Generator EM

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Audio Function Generator PRO

No in-app purchases

1 purchases

Tone Generator EM

One-time1
  • Premium Lifetime Upgrade$3.99

Questions

Is Audio Function Generator PRO free?
Audio Function Generator PRO costs $9.99, with no in-app purchases.
Is Tone Generator EM free?
Tone Generator EM is free to download, with in-app purchases available.
Which has better reviews, Audio Function Generator PRO or Tone Generator EM?
Audio Function Generator PRO is rated higher. Audio Function Generator PRO averages 4.8 out of 5 from 269 ratings, while Tone Generator EM averages 4.4 from 36 ratings.
Do Audio Function Generator PRO or Tone Generator EM have ads?
Tone Generator EM shows ads; Audio Function Generator PRO does not.
Which is updated more often, Audio Function Generator PRO or Tone Generator EM?
Audio Function Generator PRO ships an update every 6 weeks, and Tone Generator EM every 2 months. Most recently, Audio Function Generator PRO was updated on September 25, 2026 and Tone Generator EM on August 25, 2026.

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