MetaSkew vs Phase Modulator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MetaSkew
This audio effect processor offers granular delay and pitch-shifting for creating width, motion, and unique textures. Shape delay times, pitch intervals, grain size, and stereo spread with built-in LFO modulation and extensive preset categories. It's ideal for producers, musicians, and sound designers seeking controlled sonic damage and experimental soundscapes.
- Granular delay and pitch-shifting
- Adjustable grain size, smoothing, and gain
- Stereo spread and asymmetry control
- Built-in LFO modulation with multiple shapes
- Extensive preset categories for production jobs
- MIDI Learn for hardware control
- Standalone app and AUv3 plugin support
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MetaSkew is a granular delay and pitch-shift effect built for producers, musicians, and sound designers who want one processor for width, motion, ambience, and controlled damage. What you can shape: - Delay time from tight doubling to long phrase memory - Pitch from deep drops to shimmer intervals - Grain size, smoothing, and gain for soft clouds or chopped repeats - Feedback, pan, mix, and output for clean blend control - Latch for frozen textures and phrase-end captures - Spread and Skew for stereo width, asymmetry, and unstable character The signature Skew control is the fastest way to move from polished enhancement into unstable texture. Keep it low for subtle smear, or push it with Spread, Feedback, and LFO movement for broken motion. Modulation is built in. Three LFOs can run free or sync to musical divisions, with Sine, Triangle, Sample & Hold, and Saw shapes. Route movement to Delay, Pitch, Grain, Smoothing, Feedback, Mix, Pan, Spread, or Skew, then push subtle drift or obvious rhythmic motion. Presets are designed around real production jobs, not random patches. Browse Utility, Width, Pitch, Atmosphere, Motion, Rhythmic, Freeze, Destruction, and Signature categories. Save your own snapshots, recall them later, and keep user presets synced through iCloud when available. For hands-on control, MIDI Learn lets you map parameters to hardware. Default assignments cover the core effect, and MIDI CC broadcast can reflect parameter movement in connected setups. Use MetaSkew for: - Vocal throws and shimmer trails - Wide synth doubles and guitar halos - Drum stutters, glitch fills, and tempo-locked motion - Frozen pads and transition beds - Experimental resynthesis, smear, and warped ambience MetaSkew includes a standalone app and effect plugin for host apps that support AUv3 plug-ins.
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.
Screenshots
Verdict
The clearest difference is price: Phase Modulator at $1.99 against MetaSkew's $14.99. MetaSkew's advantage is device support (4 vs 2). On rating, ratings volume, ads and in-app purchases 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
MetaSkew costs $14.99 and Phase Modulator $1.99 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 — 5.0 for MetaSkew against 5.0 for Phase Modulator. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
| Parameter | MetaSkew | Phase Modulator |
|---|---|---|
| Price | $14.99 | $1.99 — better |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 5 weeks | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, Mac, Vision Pro — better | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 13 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Christian Thompson | Callback Audio, LLC |
Customer experience
MetaSkew
Phase Modulator
In-app purchases
MetaSkew
No in-app purchases
Phase Modulator
No in-app purchases









