# Robot Butter vs Melthaven

The clearest difference is price: Melthaven at $2.99 against Robot Butter's $14.99. Robot Butter's advantage is in-app purchases (none vs 1) and device support (4 vs 2). On rating, ratings volume, update cadence and ads there is nothing between them.

Robot Butter costs $14.99 and Melthaven $2.99 up front. Melthaven sells 1 one-off in-app purchase. Robot Butter asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Robot Butter against 5.0 for Melthaven. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

Robot Butter ships an update monthly, Melthaven every 6 weeks. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Robot Butter | Melthaven |
| --- | --- | --- |
| Price | $14.99 | **$2.99** |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/robot-butter/id6759990682/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/melthaven/id6761633340/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 6 weeks |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 7 MB | 23 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Mac, Vision Pro** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Christian Thompson](https://appshunter.io/developer/1511795684) | [quantovox](https://appshunter.io/developer/484686124) |

## 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


### Melthaven

[App page](https://appshunter.io/ios/app/melthaven/id6761633340)

This app provides a note-triggered phase shifter for guitarists, bassists, and synthesizers. It offers organic, rhythmic movement that syncs to your playing, with analog-modeled filters for diverse sonic textures. Enhance loops or create experimental sounds with its input-dependent modulation.

**Highlights:** Note-triggered phase shifting, Analog-modeled OTA filters, Responds to guitar and bass transients, Enhances pre-recorded loops, Input-dependent synth modulation, Low-latency engine

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Melthaven Pro | $4.99 | one-time |


## Frequently asked questions

### Is Robot Butter free?

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

### Is Melthaven free?

Melthaven costs $2.99, and also offers in-app purchases.

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

Robot Butter and Melthaven are both rated 5.0 out of 5 on the App Store, from 2 and 4 ratings respectively.

### Do Robot Butter or Melthaven have ads?

Neither Robot Butter nor Melthaven shows ads.

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

Robot Butter ships an update monthly, and Melthaven every 6 weeks. Most recently, Robot Butter was updated on November 1, 2026 and Melthaven on October 31, 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.*