Phase Monkey — Poly Synth 4+

Digital synthesis made fun

Sketch Audio, LLC

    • 5.0 • 1 Rating
    • $7.99


Phase Monkey is a polyphonic synthesizer inspired by the classic phase distortion synthesizers of the mid-1980s. However, instead of being a direct copy, Phase Monkey presents a fresh take on the classic sound engine, including the rare eight-stage envelopes. The result is a surprisingly versatile digital instrument that can produce anything from warm pads to shimmering leads to snarling basses.

Whatever you do, don’t have fun with it!

- Focused, fun, and characterful synth engine
- Touch-first design, almost the entire screen is part of a control
- Runs standalone or as AUv3 plug-in (in compatible host)
- Universal purchase on Apple platforms: runs on iPhone, iPad, and Mac
- Presets synced across your devices via iCloud
- Hook up a MIDI controller to play with a keyboard (optional)

- Eight classic phase distortion waveforms
- Dedicated modulation oscillator for ring or noise modulation
- Three rare eight-stage envelopes
- Complex modulation of pitch and timbre possible via envelopes
- LFO with five waveforms for classic modulation sounds
- Master controls: portamento, random voice pan, onboard chorus, gain
- Key behavior modes: poly, monophonic retrig, monophonic legato
- Additional MIDI modulation sources: mod wheel, pitch bend, velocity, aftertouch (channel), key follow
- Includes 40 highly usable factory presets to get you started making music

Known compatible DAWS:
- Ableton Live (11.2+)
- Logic Pro
- Reaper

Check out our YouTube:
Read the manuals:

What’s New

Version 1.0.2

New in version 1.0.2:
- Add a document picker to the preset manager for importing presets directly from Phase Monkey.
- Enable opening presets from the Files app.
- Add a latch mode to the in-app keyboard.
- Fix a bug where the app would crash when pressing extreme keys on the in-app keyboard.

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

mrdogheadSHoGoAT ,


The envelopes surprised me, because the interface doesn't immediately suggest the eight-parted nature of their function. In fact, this is something I wish the dev would rework. Fully visualizing the envelopes (perhaps tracking the timing visually, as the signal progresses), which are a key feature of the synthesizer, as it turns out, would call user attention to their use while making the synth easier to patch.

All that said, this Monkey sounds really good, with appropriate bite (all monkeys, as we know, bite - in fact, I have an appalling song with that name from some years ago). It is priced right, so everyone should go ahead and get in phase.

Developer Response ,

Thanks for the review! Glad you're liking Phase Monkey.

Yes, the envelope interface is something we have received feedback on and may be able to rework in the future. :)

Fear 2 Stop ,

Amazing … or should I say… “BANANAS”

There aren’t a lot of Phase Distortions synths on IOS…. as of 2023 we only have Shockwave and the vintage yet still excellent Phase84. The newest one, known as Phase Monkey, may be the best of the three.

The sound is excellent, no getting around it. If you’re a preset surfer, there aren’t a lot of built-in presets … but the ones there sound great. Now if you’re a sound designer like me, however, you’re gonna have a lot of fun with this little monkey. Creating patches is a breeze, and this fella is deep, yet set up in a way where it’s deceptively simple to use.

Ooga Booga yourself to the ape store I mean AppStore and grab this synth posthaste… you’ll be glad you did

Developer Response ,

Thanks for the kind words!

Eriptron ,

Just what the doctor ordered.

8-stage envelopes! :-o It’s still not completely sunk in yet…the power that is. My breakfast got cold ‘cause of this. Breakfast’ is my most important meal, being thin. It got cold!

Lol, Phase Monkey is ‘serious fun’. I have every serious gran/synth app and this is both something fresh in concept, UI, and especially, in sound and sound tapestries.

I mean 8-stages up to 10 seconds each or for milliseconds Between the detuned dual oscillators, some of the ‘standing wave’ kind of effect between the LFO and the Envelopes, then add polyphony snd you can make some pretty interesting and complex sound textures/tapestries.

Phase Monkey is real easy to use, physically with my sausage fingertips on my iPhone 12! I can not overemphasize that point for those who care. After figuring out a lot, it was off to the manual where I discovered the 8-Stages of sound.

I dare you to try and NOT make an interesting sound with Phase Monkey!

Developer Response ,

Hey Eriptron, thanks for the kind words and for taking the time to leave a review! Enjoy :)

App Privacy

The developer, Sketch Audio, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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