Phase Modulator vs Laryngeal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Phase Modulator
This app generates complex audio textures and tones by manipulating the phase of a carrier oscillator with a modulating signal. It offers two distinct modes: internal oscillator-to-oscillator modulation or using your audio input as the modulation source. Explore a wide range of sonic possibilities from shimmering harmonics to dense, inharmonic spectra.
- Phase modulation synthesis
- Internal carrier and modulator oscillators
- Audio input as modulation source
- Adjustable carrier and modulator frequencies
- Modulation index control
- Selectable oscillator waveforms
- Amplitude tracking of input audio
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PHASE MODULATOR Phase modulation perturbs the running phase of a carrier oscillator with a modulating signal. Sweeping the phase back and forth generates a series of sidebands above and below the carrier, spaced by the modulator frequency, whose number and strength grow with the Index. This is the same technique behind classic FM synthesis: small index values add a little harmonic shimmer; large values produce dense, clangorous, often inharmonic spectra. The carrier you hear is always an internal oscillator. What changes between modes is where its phase modulation comes from. ------ CONTROLS: CAR FREQ Frequency of the carrier oscillator, 20 Hz to 20 kHz. This is the audible tone in both modes. CAR AMP Level of the carrier oscillator before the Output gain. MOD FREQ Frequency of the internal modulator oscillator, 20 Hz to 20 kHz. Active in Osc + Osc only. The carrier-to-modulator frequency ratio sets the harmonic character: integer ratios give harmonic, pitched tones; non-integer ratios give bells and metallic, inharmonic results. In Input + Osc the modulator comes from your audio instead, so this control is inactive. MOD AMP Level of the modulation source before it reaches the phase. Together with Index it sets how far the carrier phase is pushed; think of it as a trim ahead of the Index multiplier. INDEX Modulation index, 0 to 10. The headline control: peak phase deviation in radians equals Index times the modulation signal. At 0 the carrier passes clean; raising it brings in progressively more sidebands and brightness. OUTPUT Makeup gain after the effect, -24 dB to +36 dB. No limiter follows this stage, so watch your meters when boosting. WAVEFORM Carrier oscillator shape: Sine, Saw, Triangle, or Square. Sine is the classic FM voice. The richer shapes already contain harmonics, so phase modulating them produces denser spectra and reacts more aggressively to Index. MOD WAVE Modulator oscillator shape (Osc + Osc mode only): Sine, Saw, Triangle, or Square. Changes the harmonic character of the modulation itself. In Input + Osc mode the modulation comes from your audio, so this picker is inactive. FOLLOW Input + Osc only. With Follow On (the default) the carrier tracks the amplitude of your incoming audio: it speaks only while signal is present and falls silent when the input does, so the plugin behaves like an effect rather than a constant tone. With Follow Off the carrier runs continuously at its set level regardless of input, which suits drones and sustained textures. In Osc + Osc there is no input to follow, so this control is inactive. ----- MODES: OSC + OSC Both carrier and modulator are internal oscillators, set by Car Freq and Mod Freq. Classic two-operator FM with no input required, good for bells, electric pianos, and metallic drones. INPUT + OSC Your track's audio becomes the modulation source, perturbing the phase of the internal carrier oscillator. Note that what you hear is the carrier shaped by your audio, not the audio itself passed through; the input controls the timbre rather than being processed in place. Mod Freq does not apply in this mode. This is the default mode. ------ A NOTE ON ALIASING Phase modulation can scatter energy well above Nyquist, so the effect runs internally at four times the host sample rate and filters on the way back down. At extreme Index settings with the saw or square carrier some residual aliasing can remain; lower the Index or the carrier frequency if you hear gritty, detuned overtones.
Laryngeal
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Laryngeal is a musical instrument modeled on your own vocal tract. Touch the square, and you're playing with resonance itself — the same physics that turns your throat, tongue, and mouth into an acoustic filter every time you speak. The fundamental stays fixed; your finger moves two filters that shape the vowel, the way your mouth normally would. Trace the surface and you're improvising with an instrument built to be played, not just heard. Look away, and it starts playing back at you — a second, slightly detuned voice echoes what you did seconds ago. Leave it alone entirely, and it never quite goes silent: it drifts, breathes, and occasionally sounds on its own. Underneath the sound is a small piece of linguistics. The five reference points on the pad aren't arbitrary — they mark /i, e, a, o, u/, the single most common five-vowel pattern across the world's languages. The name borrows from Laryngeal Theory: the idea that a class of sounds long vanished from Proto-Indo-European still lingers today as the color of a vowel. Tap "how it works" to read the rest, whenever you're curious. — One drone, two parallel formant filters, fixed fundamental — A shadow voice that replays your own recent movement, delayed and detuned — Generative drift — never left in complete silence — Minimal, monochrome interface: play first, read later — Free. No ads, no in-app purchases, no account. Headphones recommended.
Screenshots
Verdict
The clearest difference is price: Laryngeal at Free against Phase Modulator's $1.99. On ads, in-app purchases, device support and iOS requirement 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
Laryngeal is free to download; Phase Modulator costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Phase Modulator | Laryngeal |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Callback Audio, LLC | Keisuke Oki |
In-app purchases
Phase Modulator
No in-app purchases
Laryngeal
No in-app purchases





