Comparison

Audio Function Generator vs TrueEntropy

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

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
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 to use! AND THESE ARE THE ADVANCED SETTINGS/FEATURES (upgrade to PRO required): => 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 tutorial page: www.ee-toolkit.com/audio-function-generator

About

TrueEntropy

This app leverages your smartphone's camera to produce genuine random numbers by capturing thermal noise. It generates a high volume of entropy, suitable for cryptographic purposes, and can output data locally or remotely.

Highlights
  • Generate true random numbers from thermal noise
  • Utilizes smartphone camera sensor
  • High volume entropy generation
  • Output binary files locally
  • Send entropy via cryptographic relays
  • Continuous generation mode
Features
Read full description

TrueEntropy uses your phone's camera to generate true random numbers derived from thermal noise. The camera in your smartphone is so advanced that it can detect even the smallest variations produced by fundamental particle physics. We capture thermal variations in every pixel of your phone's camera to create a powerful, high volume entropy random number generator. No need to move your phone - even if your phone is resting on a desktop, it is able to pick up a sufficient quantity of thermal variations to generate random numbers at a rate of 18Mb per minute. - Generate binary files for local use via AirDrop - Send entropy to a destination machine via cryptographic relays - Continuous generation mode to constantly reseed target machines

Screenshots

Audio Function Generator4 screens
TrueEntropy3 screens

Verdict

The call

The clearest difference is in-app purchases: TrueEntropy at none against Audio Function Generator's 1. TrueEntropy also leads on iOS requirement (12.0 vs 15.5). Audio Function Generator's advantage is update cadence (every 6 weeks vs every 41 months) and ratings volume (2.2K vs 11). On price, ads 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

Both are free to download. Audio Function Generator sells 1 one-off in-app purchase. TrueEntropy asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Audio Function Generator holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 11, 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 67% of TrueEntropy's.

UpkeepUpdate frequency

Audio Function Generator ships an update every 6 weeks, TrueEntropy every 41 months. The most recent releases landed on October 10, 2026 and September 23, 2026 respectively.

Scorecard7 real differences · 3 level
Audio Function Generator versus TrueEntropy: the parameters behind the verdict, then further details
ParameterAudio Function GeneratorTrueEntropy
PriceFreeFree
Rating4.7 (2.2K ratings) — better4.5 (11 ratings)
Positive reviews77.1% of reviews — better66.7% of reviews
Number of ratings2.2K — better11
Update frequencyEvery 6 weeks — betterEvery 41 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.512.0 — better
Further details — not scored
Size14 MB10 MB
Age rating4+4+
DeveloperThomas GruberVault12, Inc.

Customer experience

Audio Function Generator

All ratings2,191 ratings
Positive91.8%
Neutral3.1%
Negative5.1%
Written reviews271 reviews
Positive77.1%
Neutral6.3%
Negative16.6%

TrueEntropy

All ratings11 ratings
Positive90.9%
Neutral9.1%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral33.3%
Negative0.0%

Bugs and requests

Audio Function Generator

Reported bugs

4 issues
  • Crashes on launch
  • Volume slider issues
  • Airplay not working
  • Sound distortion when display is active

Requested features

6 requests
  • 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
Show 1 more
  • Improve accessibility (VoiceOver support)

TrueEntropy

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Audio Function Generator

One-time1
  • Upgrade to PRO$9.99
None

TrueEntropy

No in-app purchases

Questions

Is Audio Function Generator free?
Audio Function Generator is free to download, with in-app purchases available.
Is TrueEntropy free?
TrueEntropy is free to download, with no in-app purchases.
Which has better reviews, Audio Function Generator or TrueEntropy?
Audio Function Generator is rated higher. Audio Function Generator averages 4.7 out of 5 from 2.2K ratings, while TrueEntropy averages 4.5 from 11 ratings.
Do Audio Function Generator or TrueEntropy have ads?
Neither Audio Function Generator nor TrueEntropy shows ads.
Which is updated more often, Audio Function Generator or TrueEntropy?
Audio Function Generator ships an update every 6 weeks, and TrueEntropy every 41 months. Most recently, Audio Function Generator was updated on October 10, 2026 and TrueEntropy on September 23, 2026.

Other comparisons