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.
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.
- 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
Read full descriptionHide 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
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.
- 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)
Read full descriptionHide 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
Verdict
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
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.
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.
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.
| Parameter | Audio Spectrum Analyzer | Audio Function Generator |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 3.9 (52 ratings) | 4.7 (2.2K ratings) — better |
| Positive reviews | 54.4% of reviews | 77.1% of reviews — better |
| Number of ratings | 52 | 2.2K — better |
| Update frequency | Every 7 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 6.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 1 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Black Cat Systems | Thomas Gruber |
Customer experience
Audio Spectrum Analyzer
Audio Function Generator
User reviews
Audio Spectrum Analyzer
From 52 App Store ratingsWhat 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 ratingsWhat 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 moreShow fewer
- 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 moreShow fewer
- 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 moreShow fewer
- Improve accessibility (VoiceOver support)
In-app purchases
Audio Spectrum Analyzer
No in-app purchases
Audio Function Generator
- Upgrade to PRO$9.99
Questions
Is Audio Spectrum Analyzer free?
Is Audio Function Generator free?
Which has better reviews, Audio Spectrum Analyzer or Audio Function Generator?
Do Audio Spectrum Analyzer or Audio Function Generator have ads?
Which is updated more often, Audio Spectrum Analyzer or Audio Function Generator?
Other comparisons















