Comparison

KORG iWAVESTATION vs ButterSynth

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

KORG iWAVESTATION

This app recreates a legendary 1990s synthesizer, offering time-varying timbre creation and advanced vector synthesis. Experience its unique sound-shaping potential with a renewed graphic interface and touch-based operation for iOS devices.

Highlights
  • Faithful reproduction of original WAVESTATION sound
  • Graphical wave sequence view with touch control
  • 1,500 sounds, 700+ waveforms, 55 effects
  • Powerful random sequence engine
  • AUv3 support for Logic Pro and GarageBand
  • Integration with KORG Gadget DAW
Features
Read full description

Creating sounds with time-varying timbre, on your mobile device. KORG iWAVESTATION - A wave sequence synthesizer for iOS. The WAVESTATION synthesizer went on sale in 1990. This instrument featured an advanced vector synthesis system which created new sounds by combining and connecting multiple waveforms; it provided a mix/morphing function that let you use a joystick to change the balance of four oscillators, and a distinctive wave sequence function that allowed you to place waveforms in a desired sequence to create sequence patterns. To this day, it continues to be considered a legendary and still-unique instrument. Now in 2016, the WAVESTATION has been reborn as "KORG iWAVESTATION," an app for iPad/iPhone. In addition to completely reproducing the programs, it also features a renewed design that lets everyone experience the stupendous sound-shaping potential of the WAVESTATION. It features touch-based operation that's distinctive of iOS, in conjunction with a new graphic interface that allows you to visualize and edit the time-varying timbral changes that are distinctive of the WAVESTATION. [ Features ] - A faithful reproduction of the original WAVESTATION sound: In addition to providing the sounds from all PCM memories of the WAVESTATION, the new iWAVESTATION also reproduces in software every detail of the parameters, based on an analysis of the original hardware circuit diagram. - A new wave sequence view that can be graphically controlled: The iWAVESTATION, we advance another step with a graphical user interface that takes advantage of the touch operations that are a characteristic of iOS. Even more than ever, we've updated the screen design with an emphasis on creating sequences. - 1,500 sounds, more than 700 waveforms, 55 effects, and a powerful random sequence engine: This new instrument includes a stupendous number of presets and waveforms, covering all models of the series. iWAVESTATION also provides a new random sequence function which will give you different perspectives to inspire new sounds. - Use with KORG Gadget and AUv3 for song production: iWAVESTATION can be used in conjunction with the "KORG Gadget" music production DAW app that has won numerous awards around the world. If both apps are installed, it can be used as the "Milpitas" gadget inside the KORG Gadget app. And also supports AUv3, so it can also be used as a sound module for Logic Pro and GarageBand. With a convenient and richly varied set of sounds, iWAVESTATION can be the foundation for either of these music production environments. More info at korg.com

About

ButterSynth

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.

Highlights
  • 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
Features
Read full description

ButterSynth is a hybrid 6-oscillator wavetable/FM/sample-based AUV3 and standalone synthesizer with a vast sonic range, from gentle pads to screaming leads and basslines. Mix any combination of wavetable, FM, sample and other synthesis engines for one truly massive sound. For the more advanced users, you'll love using ButterSynth's thoughtfully designed interface, incredibly powerful modulation matrix, fully-featured internal FX rack, factory waveform and sample libraries, and almost limitless scope for fun, experimentation and sound design. For less experienced synth programmers, ButterSynth includes a library of hundreds of ready-to-use presets, sparking your creativity to start making music right away. Headline features include - Mix and match any combination of 6 synthesis engines to either emulate your favourite synths of yester-year or build a synth ready for the future. - Dual-wavetable engines also feature 9 phase modes, wave folding, and deep unison controls modelled on vintage hardware synths. - Built-in wavetable editor gives you the ability to tweak, morph, and hand-draw your own custom wavetables, with each wavetable supporting up to 256 frames. - FM engine offers 4 operators with a selection of 12 modulation paths. Each operator can be loaded with any waveform from the factory or user library, and can also self-modulate via the feedback dial. - Sample and Granulator engines both let you load samples (either imported or from the factory library) and control precisely how they are chopped, triggered and layered. Both also feature the same powerful unison modes available in the WT engine. - Highly configurable 32-slot modulation matrix featuring precise mix/max ranges, self-modulation (via the amount target), plus configurable response curves and layer modes. Simply long-tap any parameter to set it as a Mod destination! - Full suite of versatile control sources which includes: 4x MSEG-style looping curve envelopes, 4x LFOs, 4x step sequencers, X/Y pad with motion recording, 8x Macro dials and a powerful arpeggiator inspired by Kirnu Interactive’s Cream. - The EFX rack lets you build your own insert effects chain using any combination of the 16 built-in FX modules. Modules available at launch include delay, reverb, distortion, chorus, OTT compression etc. Note - FX parameters can also be targeted by the mod matrix, unlocking the possibility to program ‘per voice’ modulated effects. - All presets, wavetables, samples and other settings are stored in the Files app, making bulk import/export, backup and community sharing quick and easy. - All of this is housed in an irresistibly designed 4-tab UI that makes synth programming quick and fun.

Screenshots

KORG iWAVESTATION4 screens
ButterSynth4 screens

Verdict

The call

The clearest difference is price: ButterSynth at $19.99 against KORG iWAVESTATION's $29.99. ButterSynth also leads on in-app purchases (none vs 1) and update cadence (every 2 months vs every 5 months). KORG iWAVESTATION's advantage is review sentiment (69% vs 59%). On rating, ratings volume, ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

KORG iWAVESTATION costs $29.99 and ButterSynth $19.99 up front. KORG iWAVESTATION sells 1 one-off in-app purchase. ButterSynth asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

KORG iWAVESTATION holds the better App Store score, 4.2 against 4.0. Both are backed by a comparable volume of ratings — 135 and 63 respectively. Written reviews point the same way: 69% of KORG iWAVESTATION's written reviews are positive against 59% of ButterSynth's.

UpkeepUpdate frequency

KORG iWAVESTATION ships an update every 5 months, ButterSynth every 2 months. The most recent releases landed on November 4, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level
KORG iWAVESTATION versus ButterSynth: the parameters behind the verdict, then further details
ParameterKORG iWAVESTATIONButterSynth
Price$29.99$19.99 — better
Rating4.2 (135 ratings) — better4.0 (63 ratings)
Positive reviews69.0% of reviews — better59.2% of reviews
Number of ratings135 — better63
Update frequencyEvery 5 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better14.0
Further details — not scored
Size96 MB468 MB
Age rating4+4+
DeveloperKORG INC.Arto Vaarala

Customer experience

KORG iWAVESTATION

All ratings132 ratings
Positive78.8%
Neutral8.3%
Negative12.9%
Written reviews203 reviews
Positive69.0%
Neutral17.2%
Negative13.8%

ButterSynth

All ratings63 ratings
Positive73.0%
Neutral7.9%
Negative19.0%
Written reviews71 reviews
Positive59.2%
Neutral11.3%
Negative29.6%

User reviews

KORG iWAVESTATION

From 135 App Store ratings

What we love

  • 🎹 Classic synth sounds
  • 👍 Improved interface over hardware
  • 🎨 Excellent sound design capabilities
  • 🎉 Randomize feature for inspiration
  • 🔌 Gadget integration

Room to improve

  • 🔍 Lack of preset search/organization
  • 🔊 Weak filter capabilities
  • 🔌 No MIDI channel selection
  • 🔌 Limited MIDI control options

ButterSynth

From 63 App Store ratings

What we love

  • ✨ Deep sound design capabilities
  • 🎛️ Versatile modulation matrix
  • 🔊 Great sound quality
  • 💡 Innovative wavetable generator
  • 🌟 Serum-like experience

Room to improve

  • 📱 Fiddly on small screens
  • 🐛 Crashes frequently
  • 🐛 Disappears in Cubasis
  • 🐛 Spikes CPU usage
  • 🐛 Crashes on patch change

Bugs and requests

KORG iWAVESTATION

Reported bugs

2 issues
  • Crashes when saving user presets
  • Compatibility issues with newer iOS versions

Requested features

4 requests
  • Add AUv3 support
  • Improve preset management and browsing
  • Enhance MIDI functionality (channel selection, more CCs)
  • Expand filter options (high-pass, band-pass)

ButterSynth

Reported bugs

39 issues
  • App crashing with AUM
  • Disappears in Cubasis randomly
  • Crashes all the time inside Logic
  • Changing a patch spikes CPU to 99%
  • Crashes on every patch change
Show 34 more
  • No audio when rendering or freezing track
  • Keyboard doesn't load on iPhone
  • iOS18 broke ButterSynth (audio recording issues)
  • Failed to load as Auv3
  • Crashes as soon as a preset is selected
  • Some patches hanging/sounding without input
  • CPU spikes to 100% on preset switching
  • Audio crackles on preset switching
  • Sample module has consistent buzz
  • LFOs are extremely simple (no phase offset)
  • Square wave LFO is not square (has slew)
  • Step sequencer always has glide/slew
  • Cannot save custom presets
  • No undo function in wave table editor
  • AUv3 plugin resets when ButterSynth crashes
  • Does not show up as auv3 in Cubasis, AUM, or Audio Evolution
  • Crashes regularly even on newest iPad
  • Preset changes every time play is pressed
  • Not resizing appropriately on smaller screens
  • Crashes with unison function in AUM
  • White noise on crash with unison
  • Sound continues after song stops in GarageBand
  • Preset changes on stop, rewind, or play in GarageBand
  • Keeps crashing in GarageBand (AUv3)
  • Patches in standalone sound different as AUv3
  • Crashes when hitting play with arpeggiator/sequencer on iPhone
  • No keyboard appears in iPhone standalone mode
  • Audio Unit Extension quit error on export
  • Lots of crashes in standalone and hosted in AUM
  • MIDI not working
  • Automation still doesn’t work in Logic Pro
  • Random LFO is great for recording sequences
  • Preset browser closes each time a new preset is selected
  • Works as AUv3 after starting in standalone mode

Requested features

20 requests
  • MPE popup possible on top of the auv3
  • Button to hide built-in keyboard
  • Buffer size option
  • Additional MIDI mappings (e.g., arpeggiator toggle)
  • Sustain pedal support
Show 15 more
  • Longer LFO speed for evolving soundscapes
  • Alternative skins/color themes
  • Pinable preset browser
  • Virtual keyboard to remain active while browser is pinned
  • Make app take up whole screen (no black borders)
  • Master detune
  • Parameter lock
  • More presets
  • Fix square wave LFO to be truly square
  • Fix step sequencer glide/slew for discrete steps
  • Undo function in wave table editor
  • Filter key follow button
  • Adjust envelope curves (especially release)
  • Easier way to adjust modulation matrix amount
  • Phase distortion inclusion

In-app purchases

1 purchases

KORG iWAVESTATION

One-time1
  • Expansion Card Pack$4.99
None

ButterSynth

No in-app purchases

Questions

Is KORG iWAVESTATION free?
KORG iWAVESTATION costs $29.99, and also offers in-app purchases.
Is ButterSynth free?
ButterSynth costs $19.99, with no in-app purchases.
Which has better reviews, KORG iWAVESTATION or ButterSynth?
KORG iWAVESTATION is rated higher. KORG iWAVESTATION averages 4.2 out of 5 from 135 ratings, while ButterSynth averages 4.0 from 63 ratings.
Do KORG iWAVESTATION or ButterSynth have ads?
Neither KORG iWAVESTATION nor ButterSynth shows ads.
Which is updated more often, KORG iWAVESTATION or ButterSynth?
KORG iWAVESTATION ships an update every 5 months, and ButterSynth every 2 months. Most recently, KORG iWAVESTATION was updated on November 4, 2026 and ButterSynth on November 3, 2026.

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