# Robot Butter vs Raven Synth

The clearest difference is price: Raven Synth at $6.99 against Robot Butter's $14.99. Raven Synth also leads on update cadence (every 4 days vs monthly). Robot Butter's advantage is device support (4 vs 2). On rating, review sentiment, ratings volume and ads there is nothing between them.

Robot Butter costs $14.99 and Raven Synth $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Robot Butter against 5.0 for Raven Synth. Both are backed by a comparable volume of ratings — 2 and 5 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Robot Butter ships an update monthly, Raven Synth every 4 days. The most recent releases landed on October 17, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Robot Butter | Raven Synth |
| --- | --- | --- |
| Price | $14.99 | **$6.99** |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/robot-butter/id6759990682/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/raven-synth/id6761521717/reviews) |
| Number of ratings | 2 | **5** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Monetization | Paid | Paid |
| Size | 7 MB | 10 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) | [Steffen Mølgaard Larsen](https://appshunter.io/developer/1860980002) |

## 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


### Raven Synth

[App page](https://appshunter.io/ios/app/raven-synth/id6761521717)

This powerful wavetable synthesizer allows musicians to draw custom waveforms and morph between them. Sculpt evolving textures with a deep effects chain and performance-ready interface for sound design and live playing.

**Highlights:** Dual drawable oscillators with wavetable morphing, Utility oscillator with sub, ring mod, FM, noise, and harmonics, Classic ladder filter with 12/24dB slope, Dual ADSR envelopes for filter and amp, Dual LFOs with drawable waveforms and modulation slots, Full effects chain including delay, reverb, chorus, and distortion, AUv3 instrument and MIDI support

**Features:** macOS Compatibility, 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 Raven Synth free?

Raven Synth costs $6.99, with no in-app purchases.

### Which has better reviews, Robot Butter or Raven Synth?

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

### Do Robot Butter or Raven Synth have ads?

Neither Robot Butter nor Raven Synth shows ads.

### Which is updated more often, Robot Butter or Raven Synth?

Robot Butter ships an update monthly, and Raven Synth every 4 days. Most recently, Robot Butter was updated on October 17, 2026 and Raven Synth on October 28, 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.*