ButterSynth vs Stand Partner
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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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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.
Stand Partner
This music app analyzes your instrumental or vocal performances, displaying pitch, timing, and accuracy note by note. It also functions as a digital music stand for reading, marking up, and playing sheet music.
- Note-by-note performance analysis
- Digital music stand
- Chromatic tuner
- Recording and review
- Score annotation and transposition
- Metronome with subdivisions
- Library for takes and scores
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Record a take on any instrument, or sing one, and the app draws it out note by note: the pitch of each one, how far it sat from centre, and where the pulse pushed or dragged. And the Score tab is a music stand: put your part on it and read it full screen, mark it up, and play from it. WHAT IS IN IT • Tuner: a fast, steady chromatic tuner for any instrument or voice, with the A adjustable from 400 to 450 Hz. • Record: a count-in, a take, and a review of every note in it. Takes are kept the moment they finish. • Score: photograph your part, or import a PDF or MusicXML, and read it full screen. Turn pages with a tap, a swipe or a pedal, half a page at a time if you like, or let them turn by themselves; lock the page for a performance. Annotate with a pencil or a finger — nibs, widths, colours, lasso, undo — and transpose an engraved part to any key. Record a take without leaving the page. • Coach: what has improved since the last take, and what has not. • Metronome: subdivisions, accents, tempo ramps. • Library: every take and every score, in folders and setlists. FOR EVERY INSTRUMENT Strings, winds, brass, voice, piano: if it plays a pitch, Stand Partner can hear it. Choose your instrument once and the tuner, the ranges and the review fit it. NOTHING LEAVES YOUR DEVICE There is no account, no server, and no analytics. Recordings, photographs of your music and everything the app works out from them are stored on this device only. After the app has loaded it makes no network requests at all. The app is open source, so that claim can be checked.
Screenshots
Verdict
The clearest difference is price: Stand Partner at Free against ButterSynth's $19.99. Stand Partner also leads on rating (5.0 vs 4.0) and update cadence (every 3 weeks vs every 2 months). ButterSynth's advantage is ratings volume (63 vs 2). 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
Stand Partner is free to download; ButterSynth costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Stand Partner holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: ButterSynth has 63 ratings behind it against 2, so its average is the more settled of the two.
ButterSynth ships an update every 2 months, Stand Partner every 3 weeks. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.
| Parameter | ButterSynth | Stand Partner |
|---|---|---|
| Price | $19.99 | Free — better |
| Rating | 4.0 (63 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 59.2% of reviews | — |
| Number of ratings | 63 — better | 2 |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 468 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Arto Vaarala | Ian Karoly |
Customer experience
ButterSynth
Stand Partner
Bugs and requests
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 moreShow fewer
- 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 moreShow fewer
- 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
Stand Partner
Not enough reviews yet to summarise bugs or requests.
In-app purchases
ButterSynth
No in-app purchases
Stand Partner
No in-app purchases
Questions
Is ButterSynth free?
Is Stand Partner free?
Which has better reviews, ButterSynth or Stand Partner?
Do ButterSynth or Stand Partner have ads?
Which is updated more often, ButterSynth or Stand Partner?
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