Audio Analyzer vs Undulator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Audio Analyzer
This app provides real-time visual analysis of acoustic signals. It offers detailed insights into sound through spectrum, spectrogram, oscilloscope, and RTA displays, useful for musicians, engineers, and researchers.
- Real-time spectrum analyzer
- Spectrogram analysis (color/B&W)
- Oscilloscope with full FFT window
- Octave RTA analyzer (various bands)
- SPL Meter (dBFS)
- Recording trigger
- Zoom and pan charts
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Audio Analyzer is a real-time spectrum, spectrogram, oscilloscope and octave RTA analyzer. It gives you a visual representation of an acoustic signal. It can be used to analyze the sounds of musical instruments, to identify spoken words phonetically, to measure the frequency response of audio equipment, or to picture the calls of different animals. You can also check “The Singer’s Formant”, the most important measure for every opera singer. Features - Spectrogram analyzer (color, black and white) - Spectrum analyzer - Oscilloscope (full FFT window size) - Octave RTA analyzer: bands - full, 1/3, 1/6, 1/12 (RMS values) - SPL Meter (dBFS) - Recording trigger (triggered by frequencies in the specified frequency band) - Fast real-time response - Sampling rates: 44.1kHz, 48kHz, 96kHz* - Fast Fourier Transform (FFT) - Window sizes: 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536 - Variable frequency resolution of the spectrogram - Variable between FFT computations time interval (time resolution) - Max/min Octave RTA values - Zoom and pan all charts - Measure values in all charts - Play back analysis (just tap on the spectrogram and play) - PIP (picture-in-picture), allows the simultaneous analysis on the spectrogram chart and Second chart: Octave RTA, Spectrum or Oscilloscope - Audio input can be supplied via the built-in microphone, and an external microphone* (via the earphone jack, via the USB camera adapter, or through the iPhone/iPad dock connector – Core Audio compliant devices). External devices are shown in the application only when connected (e.g. external mic connected via the earphone jack) - Sharing charts and audio recordings (through mail, social networks, clipboard) - Exporting to the iOS Document Browser (supports iCloud): audio recordings (wav) and image charts (png) - Importing audio files from another application or from the iOS Document Browser (supports iCloud) - Many formats supported for audio file import - Automatic conversion from other sampling rates for imported files - Frequency scale: linear and logarithmic - Amplitude scale: linear and logarithmic SPL/RMS (dBFS) - SPL meter weighting: dBZ - linear Make sure you use the latest iOS update. *For 96kHz analysis use an external microphone with such capabilities through a USB camera adapter or through the iPhone/iPad dock connector (internal mic or external mic connected via the earphone jack can only be used for 44.1kHz or 48kHz analysis) You can also import files recorded on an external device.
Undulator
This app offers a classic modulated tremolo effect inspired by a renowned hardware processor. It allows musicians to add rhythmic movement, ethereal feedback, and detuned echoes to various instruments and samples, creating evolving soundscapes and dynamic textures.
- Modulated tremolo effect
- Ethereal feedback and detuned echoes
- AM/FM modulation
- Tempo sync
- Real-time ribbon control
- Multiple modulation waveforms
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Undulator is Eventide’s classic modulated tremolo effect from the iconic H3000 effects processor. This unique, rhythmic effect combines ethereal feedback and detuned echos, run through an AM / FM modulated tremolo. Whether used for manipulating samples or adding movement to strings, pads, guitars, and keys, Undulator is a muse for creative musicians. Add Undulator into your plug-ins collection for the most playable tremolo-style effect on your DAW or iOS device. Undulator excels at evolving pads, sync’d chops, and time-lapsing dreamy soundscapes. Combined with a multi-tap delay and powerful tremolo, Undulator’s controls give any sound sustain and shape. This is perfect for transforming ordinary synths, keys, guitars, and even vocals into evolving pads, tempo synced production elements, or ethereal and fluctuant delays. Simply put, Undulator can make shorter sounds into longer layered effects, and give sustaining sounds shape and rhythmic character. Use the Ribbon to morph tremolo patterns into vacillating and varying rhythmic territories. This can be effective for calling attention to synth pads and creating a state of flux or rarity which is otherwise arduous to achieve. - Turn up the MIX to increase the dry/effect ratio. - Utilize multiple modulation waveform shapes and sources to alter the rhythmic feel. - Subtly finesse detuning of delays by using SPREAD. - Add FEEDBACK to accentuate delays or create infinite loops. - The Secondary LFO determines how fast the depth and speed modulation “wiggle” their targets. - Lock the tremolo to tempo using SYNC. - RETRIG at the top of the waveform for a more predictable effect. - RIBBON lets you ‘play’ the effect in real-time and provides dynamic and fluid control to morph back and forth between the settings of your choice. - SLOW/FAST button toggles on a “Slow LFO” mode. Holding it down to “BRAKE” temporarily slows down the LFOs at a constant rate until released. - Update the tremolo speed in real time using the TAP button. - Available as an AUv3 plug-in and Standalone App.
Screenshots
Verdict
Audio Analyzer and Undulator both sit at 4.4 stars, but that hides the real split: 86% of Undulator's written reviews are positive against 61% of Audio Analyzer's. Undulator also leads on update cadence (every 2 months vs every 6 months) and price ($7.99 vs $9.99). Audio Analyzer's advantage is ratings volume (40 vs 12). On rating, ads, in-app purchases and monetization model 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 Analyzer costs $9.99 and Undulator $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.4 for Audio Analyzer against 4.3 for Undulator. Both are backed by a comparable volume of ratings — 40 and 12 respectively. Written reviews are what separate them: 61% of Audio Analyzer's written reviews are positive against 86% of Undulator's.
Audio Analyzer ships an update every 6 months, Undulator every 2 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.
| Parameter | Audio Analyzer | Undulator |
|---|---|---|
| Price | $9.99 | $7.99 — better |
| Rating | 4.4 (40 ratings) — better | 4.3 (12 ratings) |
| Positive reviews | 60.9% of reviews | 85.7% of reviews — better |
| Number of ratings | 40 — better | 12 |
| Update frequency | Every 6 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.4 | 11.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | DEXUS Pawel Krzywdzinski | Eventide |
Customer experience
Audio Analyzer
Undulator
In-app purchases
Audio Analyzer
No in-app purchases
Undulator
No in-app purchases
Questions
Is Audio Analyzer free?
Is Undulator free?
Which has better reviews, Audio Analyzer or Undulator?
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