# WretchUp vs Robot Butter

The clearest difference is price: WretchUp at $4.99 against Robot Butter's $14.99. WretchUp also leads on ratings volume (9 vs 2) and iOS requirement (11.0 vs 17.0). Robot Butter's advantage is rating (5.0 vs 3.1) and review sentiment (100% vs 91%). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

WretchUp costs $4.99 and Robot Butter $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Robot Butter holds the better App Store score, 5.0 against 3.1. Both are backed by a comparable volume of ratings — 9 and 2 respectively. Written reviews point the same way: 91% of WretchUp's written reviews are positive against 100% of Robot Butter's.

WretchUp ships an update every 3 weeks, Robot Butter monthly. The most recent releases landed on October 3, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | WretchUp | Robot Butter |
| --- | --- | --- |
| Price | **$4.99** | $14.99 |
| Rating | [3.1 (9 ratings)](https://appshunter.io/ios/app/wretchup/id928543264/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/robot-butter/id6759990682/reviews)** |
| Number of ratings | **9** | 2 |
| Positive reviews | 90.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Paid | Paid |
| Size | 15 MB | 7 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [MoMinstruments GbR](https://appshunter.io/developer/953815356) | [Christian Thompson](https://appshunter.io/developer/1511795684) |

## What reviewers say

### WretchUp

[App page](https://appshunter.io/ios/app/wretchup/id928543264)

This app offers a unique audio manipulation experience, allowing users to create sonic mayhem with pitch-shifted delays, filters, and sampling. It's designed for live performance and studio use, enabling musicians and sound enthusiasts to generate wild noises and unique effects.

**Highlights:** Pitch-shifted delay with feedback and filter, Live performance-oriented controls, Gesture-based play, Record vocals and instruments, Sample and manipulate loops, Inter-App-Audio and Audiobus support

**Features:** Vision Pro support

**In-app purchases:** none


### 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


## Frequently asked questions

### Is WretchUp free?

WretchUp costs $4.99, with no in-app purchases.

### Is Robot Butter free?

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

### Which has better reviews, WretchUp or Robot Butter?

Robot Butter is rated higher. WretchUp averages 3.1 out of 5 from 9 ratings, while Robot Butter averages 5.0 from 2 ratings.

### Do WretchUp or Robot Butter have ads?

Neither WretchUp nor Robot Butter shows ads.

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

WretchUp ships an update every 3 weeks, and Robot Butter monthly. Most recently, WretchUp was updated on October 3, 2026 and Robot Butter on October 17, 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.*