Robot Butter vs VAPolyMk5
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Robot Butter
This audio effect app creates dynamic soundscapes by blending animated modulation, adaptive reverb, and digital textures. It offers a fast, playable interface with direct control over key parameters and tempo-synced movement for evolving sound design.
- AUv3 audio effect for iPhone, iPad, and macOS
- Animated modulation engine
- Adaptive reverb stage
- Tempo-synced LFO matrix
- Digital texture effects
- Built-in user manual
- Factory and user presets
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Robot Butter is a creative AUv3 audio effect for compatible hosts on iOS & iPadOS. It blends animated modulation, adaptive reverb, tempo-aware movement, and digital texture into one fast, playable interface. At the core is the Robot engine, where Actuator, Viscosity, and Controller create the main motion and character of the signal. That signal then feeds Butter, an adaptive reverb stage designed to intelligently stay musical while responding to the effective movement of the Robot section. The result can move from focused width and pulse to washed ambience, strange motion, and unstable experimental color. The Chipset section extends the sound with a built-in assignable LFO matrix and a post-reverb System Bus reduction stage. Run the LFO freely in Hz or lock it to musical divisions for host-synced movement, then route it to key Robot or Butter controls for evolving motion. Add System Bus for subtle grain or push it harder for sharper, crushed digital edge. Robot Butter is designed to stay immediate. The interface gives you direct control over modulation, blend, depth, reverb shape, output mix, and motion timing without pushing you into a complicated modulation environment. A built-in user manual inside the standalone app includes overview pages, parameter explanations, quick-start guidance, glossary entries, MIDI notes, and troubleshooting help, with scrollable section pills that keep longer labels readable. Factory presets and user presets make it easy to jump from polished mix enhancement to stylized movement and aggressive sound design. Features: - Robot modulation engine with Actuator, Viscosity, Controller, and gain staging - Butter adaptive reverb with Churn, Emulsion, and Culture controls - Built-in LFO matrix with free or tempo-synced timing - Assignable LFO destinations across Robot and Butter parameters - System Bus sample-rate reduction stage for animated digital texture - Imaging modes including Mono, Wide, Ping, and Drift when stereo processing is available - Factory presets covering vocals, guitars, bass, keys, synths, drums, utility, and experimental categories - User preset save, recall, and delete support - Comprehensive built-in in-app user manual with quick-start, glossary, and troubleshooting sections - MIDI Learn, Host Learn support, and default CC mappings for hands-on control - Optional MIDI CC broadcast for compatible host-routing workflows - Host tempo sync with straight, dotted, and triplet divisions Use Robot Butter for vocal movement, guitar widening, synth pulse, drum bus animation, ambient wash design, or aggressive lo-fi modulation chains. It is built to move quickly from musical enhancement to animated destruction while keeping the workflow focused and playable.
VAPolyMk5
This is a powerful bitimbral polyphonic synthesizer with a re-designed step sequencer. It offers advanced oscillator features, a cascaded OTA low-pass filter, and extensive modulation capabilities. Operate it as a standalone app or an AudioUnit Extension.
- Bitimbral polyphonic synthesis
- Re-designed step sequencer
- Hard sync and through zero FM oscillators
- Cascaded OTA low-pass filter
- AudioUnit Extension (AUv3) support
- Ableton Link and MIDI 2.0 support
- Built-in effects suite
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VAPolyMk5 is bitimbral polyphonic synthesizer. Main feature of Mk5 is re-designed step sequencer which contains one note sequencer and three modulation sequencers. Oscillator feature hard sync and through zero FM. Low pass Filter is modeled on cascaded OTA -24dB per octave low pass filter circuit. Each synthesizer consists of three oscillators, resonant low pass and high pass filter, amplifier, three envelope generators, two LFO and key tracking. Two synthesizers can be configured as layer or split. Mk5 also features global LFO, output morphing, classic ring modulator and easy target assignment for mod wheel and aftertouch. VAPolyMk5 operates as a stand alone or as an AudioUnit Extension (AUv3) for iPhone, iPad and Mac. Stand Alone supports Ableton Link, MIDI and audio file export. Built-in Effects include delay, chorus, flanger, reverb, eq and compressor. Project files can be saved in iCloud Drive, so that the project can be accessed from iPhone, iPad or Mac. Main Features Bi-timbral Polyphonic Synthesizer Oscillators feature hard sync and through zero FM. Low pass Filter is modeled on cascaded OTA -24dB per octave low pass filter circuit. Re-designed step sequencer Re-designed offset control Improved output morphing. Improved classic ring modulator. Improved key tracking Easy target assignment for mod wheel and aftertouch Maximum 8 voice polyphony. it depends on performance of the device it is running. Built-in effects and piano roll sequencer. Audio Export. Linear PCM format (AIFF, WAV and CAF) and compressed format (AAC) Support Audio Unit Extension (AUv3). Support MIDI 2.0. Support Foot Pedal and Per Note Control. Support Ableton Link, Bluetooth MIDI, MIDI In / Out. Works on iPhone, iPad and Mac. Support iCloud Drive to share project files between the platforms. General Improvements Support MIDI Foot Pedal (CC#11, CC#64) Support MIDI2.0 Per Note Control Messages MIDI CC Settings are saved. It will be recovered when the app launched in the next time. UI Color can be selected from black, navy, gray or blown. Adjustable text size for title of controls Factory Preset 208 Synth CH Preset 256 Effect Preset 40 Default & Macro 8 System Requirements iOS 17.0 or later macOS 14.0 or later Devices with Apple Silicon are recommended. A13 Fusion or above is highly recommended. AudioUnit Extension (AUv3) requires host application which support AudioUnit Extension. AudioUnit Extension is supported by Apple Logic and Apple Garage Band on iOS and macOS. For any other DAW, it depends on the application and some of them don’t support AudioUnit Extension. Sound may be distorted if CPU of the device doesn't have enough power. If it happens reduce number of voices or enable Low Power Mode in setting panel. App launches in Low Power Mode in the first time on device with iOS earlier than iOS 18.0 as mono-timbral.
Screenshots
Verdict
The clearest difference is price: VAPolyMk5 at $3.99 against Robot Butter's $14.99. VAPolyMk5 also leads on update cadence (weekly vs monthly). On review sentiment, ads, in-app purchases and monetization model 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
Robot Butter costs $14.99 and VAPolyMk5 $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Robot Butter ships an update monthly, VAPolyMk5 weekly. The most recent releases landed on November 1, 2026 and October 26, 2026 respectively.
| Parameter | Robot Butter | VAPolyMk5 |
|---|---|---|
| Price | $14.99 | $3.99 — better |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 2 — better | — |
| Update frequency | Monthly | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, Mac, Vision Pro — better | iPhone, iPad, Mac |
| Requires iOS | 17.0 | 16.6 — better |
| Further details — not scored | ||
| Size | 7 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | Christian Thompson | Ryo Togawa |
Customer experience
Robot Butter
VAPolyMk5
In-app purchases
Robot Butter
No in-app purchases
VAPolyMk5
No in-app purchases







