# Poseidon Synth vs RJM Pedal Editor

The clearest difference is price: RJM Pedal Editor at Free against Poseidon Synth's $7.99. Poseidon Synth's advantage is update cadence (every 4 months vs every 43 months) and iOS requirement (12.0 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

RJM Pedal Editor is free to download; Poseidon Synth costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Poseidon Synth ships an update every 4 months, RJM Pedal Editor every 43 months. The most recent releases landed on November 2, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Poseidon Synth | RJM Pedal Editor |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[4.0 (33 ratings)](https://appshunter.io/ios/app/poseidon-synth/id1045058006/reviews)** | — |
| Number of ratings | **33** | — |
| Positive reviews | 58.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 43 months |
| Monetization | Paid | — |
| Size | 328 MB | 28 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Harry Gohs](https://appshunter.io/developer/382428644) | [RJM Music Technology, Inc.](https://appshunter.io/developer/1579790717) |

## What reviewers say

### Poseidon Synth

[App page](https://appshunter.io/ios/app/poseidon-synth/id1045058006)

Explore vast sonic landscapes with this advanced synthesizer. It combines analog synthesis with spectral modeling for unique sound design, offering powerful filters, spatialization, and a vast library of presets and sound models.

**Highlights:** Spectral model oscillator, F-Domain Filter with variable slope, Spatializer for stereo movement, Extensive sound browser, Arpeggiator with programmable sequences, Built-in effects suite

**In-app purchases:** none


### RJM Pedal Editor

[App page](https://appshunter.io/ios/app/rjm-pedal-editor/id1612327117)

**In-app purchases:** none


## Frequently asked questions

### Is Poseidon Synth free?

Poseidon Synth costs $7.99, with no in-app purchases.

### Is RJM Pedal Editor free?

RJM Pedal Editor is free to download, with no in-app purchases.

### Do Poseidon Synth or RJM Pedal Editor have ads?

Neither Poseidon Synth nor RJM Pedal Editor shows ads.

### Which is updated more often, Poseidon Synth or RJM Pedal Editor?

Poseidon Synth ships an update every 4 months, and RJM Pedal Editor every 43 months. Most recently, Poseidon Synth was updated on November 2, 2026 and RJM Pedal Editor on November 12, 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.*