# Robot Butter vs VAPolyMk5

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.

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.

## The numbers

| Metric | Robot Butter | VAPolyMk5 |
| --- | --- | --- |
| Price | $14.99 | **$3.99** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/robot-butter/id6759990682/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Paid | Paid |
| Size | 7 MB | 21 MB |
| Requires iOS | 17.0 | **16.6** |
| Devices | **iPhone, iPad, Mac, Vision Pro** | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Christian Thompson](https://appshunter.io/developer/1511795684) | [Ryo Togawa](https://appshunter.io/developer/1474193056) |

## What reviewers say

### Robot Butter

[App page](https://appshunter.io/ios/app/robot-butter/id6759990682)

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.

**Highlights:** 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

**In-app purchases:** none


### VAPolyMk5

[App page](https://appshunter.io/ios/app/vapolymk5/id6761029576)

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.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Robot Butter free?

Robot Butter costs $14.99, with no in-app purchases.

### Is VAPolyMk5 free?

VAPolyMk5 costs $3.99, with no in-app purchases.

### Do Robot Butter or VAPolyMk5 have ads?

Neither Robot Butter nor VAPolyMk5 shows ads.

### Which is updated more often, Robot Butter or VAPolyMk5?

Robot Butter ships an update monthly, and VAPolyMk5 weekly. Most recently, Robot Butter was updated on November 1, 2026 and VAPolyMk5 on October 26, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*