ButterSynth

ButterSynth

by Arto Vaarala

61 ratings
57 reviews
#194 in paid Music
📊 Productivity
🎵 Music
$19.99

Lowest price: $5.99 2 years ago (-234%)


Price history


Details

  • Released
  • Updated
  • April 28, 2023
  • December 8, 2023
ButterSynth screenshot #1 for iPhone
ButterSynth screenshot #2 for iPhone
ButterSynth screenshot #3 for iPhone
ButterSynth screenshot #4 for iPhone
ButterSynth screenshot #5 for iPhone
ButterSynth screenshot #6 for iPhone
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About

This powerful synthesizer app offers a hybrid approach, combining wavetable, FM, and sample-based synthesis. Create unique sounds with a vast sonic range, advanced modulation, and a built-in effects rack. It caters to both experienced sound designers and beginners with extensive presets.

Hybrid 6-oscillator synthesis (wavetable, FM, sample)
Built-in wavetable editor
FM engine with 4 operators
Sample and Granulator engines
32-slot modulation matrix
Internal FX rack with 16 modules
Extensive preset library
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What users say

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What's New in ButterSynth

1.04

December 8, 2023

- Fixed: Note panning issue which occurred at the beginning of the note

Charts

Top Paid

📉 194-23

Music

This app dropped -23 positions in Music chart.

Last updated on July 20, 2026.

User reviews

Updated review years later.

Originally I said that the synth wasn’t great on small screens, but after years of playing around in the iOS music app scene, I’ve come back to this synth as an absolute classic. I’ve gone deep on what’s available here, with two wavetables, with a wavetables generator tool that you can use to tweak harmonics, FM modulation, a wide arrange of filters…. Honestly, amazing. This synth should get much more attention. Whilst it is fiddly to edit on a phone screen, at least it is available on phones and plays presents developed on larger screens (when needed) perfectly. It’s honestly a brilliant balance of functionality and usability and I understand why compromises had to be made to keep it as functional as it is smaller screens. Honestly one of the best, if not the best synths in the iOS/iPadOS toolkit. Really excellent work.
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App crashing

With regular use, I’ve had it crash with AUM. Great app. When it’s not crashing.

Most complete Pro SoftSynth

Awesome and Functional...mpe popup possible on top of the auv3 As an addition?

Serum for iPad

This is one rude synth and I’m lovin it bada ba ba baah no joke this is dutty just how I like em

Amazing, but disappears in Cubasis randomly

Amazing Synth. Great for DnB. Unfortunately one major issue for Cubasis users is that it randomly disappears from time to time leaving entire parts of your track missing. This makes it impossible to work with.

Developer apps

User experience

🐞

Reported Bugs

39 issues

App crashing with AUM

Bug

Disappears in Cubasis randomly

Bug

Crashes all the time inside Logic

Bug

Changing a patch spikes CPU to 99%

Bug

Crashes on every patch change

Bug

No audio when rendering or freezing track

Bug

Keyboard doesn't load on iPhone

Bug

iOS18 broke ButterSynth (audio recording issues)

Bug

Failed to load as Auv3

Bug

Crashes as soon as a preset is selected

Bug

Some patches hanging/sounding without input

Bug

CPU spikes to 100% on preset switching

Bug

Audio crackles on preset switching

Bug

Sample module has consistent buzz

Bug

LFOs are extremely simple (no phase offset)

Bug

Square wave LFO is not square (has slew)

Bug

Step sequencer always has glide/slew

Bug

Cannot save custom presets

Bug

No undo function in wave table editor

Bug

AUv3 plugin resets when ButterSynth crashes

Bug

Does not show up as auv3 in Cubasis, AUM, or Audio Evolution

Bug

Crashes regularly even on newest iPad

Bug

Preset changes every time play is pressed

Bug

Not resizing appropriately on smaller screens

Bug

Crashes with unison function in AUM

Bug

White noise on crash with unison

Bug

Sound continues after song stops in GarageBand

Bug

Preset changes on stop, rewind, or play in GarageBand

Bug

Keeps crashing in GarageBand (AUv3)

Bug

Patches in standalone sound different as AUv3

Bug

Crashes when hitting play with arpeggiator/sequencer on iPhone

Bug

No keyboard appears in iPhone standalone mode

Bug

Audio Unit Extension quit error on export

Bug

Lots of crashes in standalone and hosted in AUM

Bug

MIDI not working

Bug

Automation still doesn’t work in Logic Pro

Bug

Random LFO is great for recording sequences

Bug

Preset browser closes each time a new preset is selected

Bug

Works as AUv3 after starting in standalone mode

Bug

Requested Features

20 requests

MPE popup possible on top of the auv3

Feature

Button to hide built-in keyboard

Feature

Buffer size option

Feature

Additional MIDI mappings (e.g., arpeggiator toggle)

Feature

Sustain pedal support

Feature

Longer LFO speed for evolving soundscapes

Feature

Alternative skins/color themes

Feature

Pinable preset browser

Feature

Virtual keyboard to remain active while browser is pinned

Feature

Make app take up whole screen (no black borders)

Feature

Master detune

Feature

Parameter lock

Feature

More presets

Feature

Fix square wave LFO to be truly square

Feature

Fix step sequencer glide/slew for discrete steps

Feature

Undo function in wave table editor

Feature

Filter key follow button

Feature

Adjust envelope curves (especially release)

Feature

Easier way to adjust modulation matrix amount

Feature

Phase distortion inclusion

Feature

FAQ

What kind of synthesis does ButterSynth offer?

ButterSynth is a hybrid synthesizer that combines multiple synthesis engines. It features wavetable synthesis, FM synthesis, and sample-based synthesis, allowing for a vast sonic range and unique sound design possibilities.

Can I create my own wavetables in ButterSynth?

Yes, ButterSynth includes a built-in wavetable editor. This allows you to tweak, morph, and hand-draw your own custom wavetables, with each wavetable supporting up to 256 frames for deep customization.

What are the advanced features for experienced users?

Experienced users will appreciate the thoughtfully designed interface, incredibly powerful 32-slot modulation matrix, fully-featured internal FX rack with 16 modules, and extensive control sources like MSEG envelopes and LFOs. The ability to mix and match synthesis engines also offers limitless scope for sound design.

Is ButterSynth suitable for beginners?

Yes, ButterSynth includes a library of hundreds of ready-to-use presets designed to spark creativity for less experienced synth programmers. This allows users to start making music right away without needing to learn complex synthesis techniques from scratch.

How are presets and samples managed?

All presets, wavetables, samples, and other settings are stored in the Files app. This makes bulk import/export, backup, and community sharing quick and easy, facilitating collaboration and organization.