Comparison

Audio Spectrum Analyzer vs Audio Function Generator

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

Head to head
About

Audio Spectrum Analyzer

Transform your iOS device into a powerful audio spectrum analyzer. Visualize frequencies up to 20 kHz with customizable display options including frequency span, FFT size, and logarithmic views. Enhance analysis with filtering, peak hold, and adjustable decay rates.

Highlights
  • Frequency analysis up to 20 kHz
  • Adjustable frequency span and FFT size
  • Logarithmic frequency display
  • Graph fill mode toggle
  • Up to five frequency markers
  • Spectrum filtering and averaging
  • Peak hold with adjustable decay rate
Features
Read full description

Spectrum Pad turns your iPad, iPhone, or iPod Touch into an audio spectrum analyzer. Frequencies up to 20 kHz can be displayed. You can control the displayed frequency span, as well as the FFT size, from 1024 to 262144 bins. A logarithmic display of the entire 10 Hz to 20 kHz frequency range is available, and the graph fill mode can be turned on and off, as well as the display of up to five frequency markers. Filtering (averaging) can be applied to the spectrum, to smooth out variations. You can turn on the Peak Hold to make it easier to see transient events, as well as adjust the decay rate. Swiping with two fingers lets you adjust the brightness of the spectrum or the graticule grid overlay. Tapping three times with two fingers will save a screenshot to your Photos. One of several user selectable window functions can be used: Rectangular Hanning Hamming Tukey Cosine Lanczos Blackman

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

Screenshots

Audio Spectrum Analyzer4 screens
Audio Function Generator4 screens

Verdict

The call

The clearest difference is price: Audio Function Generator at Free against Audio Spectrum Analyzer's $3.99. Audio Function Generator also leads on rating (4.7 vs 3.9) and update cadence (every 6 weeks vs every 7 months). Audio Spectrum Analyzer's advantage is in-app purchases (none vs 1) and iOS requirement (6.0 vs 15.5). On 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

Audio Function Generator is free to download; Audio Spectrum Analyzer costs $3.99 up front. Audio Function Generator sells 1 one-off in-app purchase. Audio Spectrum Analyzer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Audio Function Generator holds the better App Store score, 4.7 against 3.9. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 52, so its average is the more settled of the two. Written reviews point the same way: 54% of Audio Spectrum Analyzer's written reviews are positive against 77% of Audio Function Generator's.

UpkeepUpdate frequency

Audio Spectrum Analyzer ships an update every 7 months, Audio Function Generator every 6 weeks. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.

Scorecard8 real differences · 2 level
Audio Spectrum Analyzer versus Audio Function Generator: the parameters behind the verdict, then further details
ParameterAudio Spectrum AnalyzerAudio Function Generator
Price$3.99Free — better
Rating3.9 (52 ratings)4.7 (2.2K ratings) — better
Positive reviews54.4% of reviews77.1% of reviews — better
Number of ratings522.2K — better
Update frequencyEvery 7 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS6.0 — better15.5
Further details — not scored
Size1 MB14 MB
Age rating4+4+
DeveloperBlack Cat SystemsThomas Gruber

Customer experience

Audio Spectrum Analyzer

All ratings52 ratings
Positive69.2%
Neutral9.6%
Negative21.2%
Written reviews68 reviews
Positive54.4%
Neutral10.3%
Negative35.3%

Audio Function Generator

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

User reviews

Audio Spectrum Analyzer

From 52 App Store ratings

What we love

  • 👍 Handy for recording studio
  • 👍 Excellent for analyzing noise
  • 👍 Intuitive and simple
  • 👍 Great for tuning
  • 👍 Accurate on iPad mini

Room to improve

  • 👎 Does not work with newer iPhones
  • 👎 Not updated in years
  • 👎 Stopped working quickly
  • 👎 Sold with false pretenses
  • 👎 Extremely slow on iPhone 7

Audio Function Generator

From 2.2K App Store ratings

What we love

  • 👍 Great app
  • 🎶 Helps with Tinnitus
  • 💯 Best app I've paid for
  • 🔍 Highly recommended
  • 🎨 Attention to detail

Room to improve

  • 🐛 Crashes
  • 💰 Deceptive/Money hungry
  • 🔒 Basic features paywalled
  • 🔒 Limited without paying
  • 🔒 Removed functionality to push paid version

Bugs and requests

Audio Spectrum Analyzer

Reported bugs

14 issues
  • No way to exit on iPhones without Home button
  • Doesn't work with iPhone XR
  • Stopped working after about 3 minutes
  • Zooming sometimes doesn't work
  • Resuming app makes it not display frequency data
Show 9 more
  • Cannot pinch to zoom in frequency domain
  • Peak hold feature is unnecessary/freezes
  • Graph disappears
  • Screen update is slow
  • White screen only on iPad 1
  • Vertical volume scale incorrect
  • Laggy controls
  • Cannot see entered text
  • Fatal, doesn't work, jerky

Requested features

19 requests
  • Running average of spectrums
  • Ability to exit on iPhones without Home button
  • Ability to reset peak hold with a tap
  • Go to 40 kHz
  • Expand instructions for filtering window
Show 14 more
  • Zoom on Y axis (amplitude)
  • Freeze spectrum and save/email
  • Isolate portions of the spectrum
  • Apple Watch port
  • More detailed grid
  • Linear vertical axis
  • More control over FFT parameters
  • Waterfall display
  • Sliding cursor/zoom window
  • Manually place markers
  • Pause, peak hold, save functions
  • Waterfall view
  • Configurable averaging
  • More functions

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)

In-app purchases

None

Audio Spectrum Analyzer

No in-app purchases

1 purchases

Audio Function Generator

One-time1
  • Upgrade to PRO$9.99

Questions

Is Audio Spectrum Analyzer free?
Audio Spectrum Analyzer costs $3.99, with no in-app purchases.
Is Audio Function Generator free?
Audio Function Generator is free to download, with in-app purchases available.
Which has better reviews, Audio Spectrum Analyzer or Audio Function Generator?
Audio Function Generator is rated higher. Audio Spectrum Analyzer averages 3.9 out of 5 from 52 ratings, while Audio Function Generator averages 4.7 from 2.2K ratings.
Do Audio Spectrum Analyzer or Audio Function Generator have ads?
Neither Audio Spectrum Analyzer nor Audio Function Generator shows ads.
Which is updated more often, Audio Spectrum Analyzer or Audio Function Generator?
Audio Spectrum Analyzer ships an update every 7 months, and Audio Function Generator every 6 weeks. Most recently, Audio Spectrum Analyzer was updated on September 30, 2026 and Audio Function Generator on September 29, 2026.

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