Live Spectrogram vs Audio Function Generator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Live Spectrogram
Visualize sound frequencies in real-time with this tool. It displays audio intensity across time and frequency using color, helping you perfect singing, analyze animal calls, or locate household noises.
- Real-time audio visualization
- Frequency analysis
- Time-based spectrum display
- Intensity shown by color
- Singing voice perfection
- Animal call analysis
- Sound source identification
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Visualize audio with this handy tool. It displays the frequencies of sound around you over time. The horizontal axis is time, the vertical is frequency, and the intensity of frequencies is shown using pretty shades of red. Use it to: Perfect your singing voice Analyze the call of animals Identify and locate annoying sounds around your house Learn about the world of frequency analysis I hope you enjoy this handy little tool!
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)
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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 Live Spectrogram's $1.99. Audio Function Generator also leads on update cadence (every 6 weeks vs every 31 months) and ratings volume (2.2K vs 6). Live Spectrogram's advantage is in-app purchases (none vs 1) and chart position (#172 vs unranked). On rating, 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; Live Spectrogram costs $1.99 up front. Audio Function Generator sells 1 one-off in-app purchase. Live Spectrogram asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.8 for Live Spectrogram against 4.7 for Audio Function Generator. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 63% of Live Spectrogram's written reviews are positive against 77% of Audio Function Generator's.
Live Spectrogram ships an update every 31 months, Audio Function Generator every 6 weeks. The most recent releases landed on September 4, 2026 and September 24, 2026 respectively.
| Parameter | Live Spectrogram | Audio Function Generator |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.8 (6 ratings) — better | 4.7 (2.2K ratings) |
| Positive reviews | 62.5% of reviews | 77.1% of reviews — better |
| Number of ratings | 6 | 2.2K — better |
| Update frequency | Every 31 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Best chart rank | #172 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 15 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Krueger Systems, Inc. | Thomas Gruber |
Customer experience
Live Spectrogram
Audio Function Generator
Bugs and requests
Live Spectrogram
Not enough reviews yet to summarise bugs or 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
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- Improve accessibility (VoiceOver support)
In-app purchases
Live Spectrogram
No in-app purchases
Audio Function Generator
- Upgrade to PRO$9.99
Questions
Is Live Spectrogram free?
Is Audio Function Generator free?
Which has better reviews, Live Spectrogram or Audio Function Generator?
Do Live Spectrogram or Audio Function Generator have ads?
Which is updated more often, Live Spectrogram or Audio Function Generator?
Other comparisons
