# Poseidon Synth vs OPL AUv3 FM Synth

The clearest difference is rating: OPL AUv3 FM Synth at 4.4 against Poseidon Synth's 4.0. OPL AUv3 FM Synth also leads on review sentiment (73% vs 59%) and device support (3 vs 1). Poseidon Synth's advantage is price ($7.99 vs $9.99) and iOS requirement (12.0 vs 15.0). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Poseidon Synth costs $7.99 and OPL AUv3 FM Synth $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OPL AUv3 FM Synth holds the better App Store score, 4.4 against 4.0. Both are backed by a comparable volume of ratings — 33 and 24 respectively. Written reviews point the same way: 59% of Poseidon Synth's written reviews are positive against 73% of OPL AUv3 FM Synth's.

Poseidon Synth ships an update every 4 months, OPL AUv3 FM Synth every 3 months. The most recent releases landed on August 4, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Poseidon Synth | OPL AUv3 FM Synth |
| --- | --- | --- |
| Price | **$7.99** | $9.99 |
| Rating | [4.0 (33 ratings)](https://appshunter.io/ios/app/poseidon-synth/id1045058006/reviews) | **[4.4 (24 ratings)](https://appshunter.io/ios/app/opl-auv3-fm-synth/id1516617949/reviews)** |
| Number of ratings | **33** | 24 |
| Positive reviews | 58.8% of reviews | **72.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Size | 328 MB | 35 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Harry Gohs](https://appshunter.io/developer/382428644) | [DiscoDSP LLC](https://appshunter.io/developer/1465262828) |

## 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


### OPL AUv3 FM Synth

[App page](https://appshunter.io/ios/app/opl-auv3-fm-synth/id1516617949)

Emulates the iconic Yamaha OPL2 chip for classic game soundtracks and electronic music. Offers FM and additive synthesis with over 2000 presets and 16x oversampling for clear audio. Requires a MIDI keyboard for standalone use.

**Highlights:** OPL2 chip emulation, FM and additive synthesis, Distinctive percussion mode, 16x oversampling, Over 2000 presets, Standalone MIDI keyboard support

**In-app purchases:** none


## Frequently asked questions

### Is Poseidon Synth free?

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

### Is OPL AUv3 FM Synth free?

OPL AUv3 FM Synth costs $9.99, with no in-app purchases.

### Which has better reviews, Poseidon Synth or OPL AUv3 FM Synth?

OPL AUv3 FM Synth is rated higher. Poseidon Synth averages 4.0 out of 5 from 33 ratings, while OPL AUv3 FM Synth averages 4.4 from 24 ratings.

### Do Poseidon Synth or OPL AUv3 FM Synth have ads?

Neither Poseidon Synth nor OPL AUv3 FM Synth shows ads.

### Which is updated more often, Poseidon Synth or OPL AUv3 FM Synth?

Poseidon Synth ships an update every 4 months, and OPL AUv3 FM Synth every 3 months. Most recently, Poseidon Synth was updated on August 4, 2026 and OPL AUv3 FM Synth on September 20, 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.*