# amoenus externus vs PX1 FM Synth

The clearest difference is price: amoenus externus at $2.99 against PX1 FM Synth's $7.99. amoenus externus also leads on iOS requirement (12.0 vs 17.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

amoenus externus costs $2.99 and PX1 FM Synth $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

amoenus externus ships an update fortnightly, PX1 FM Synth every 2 weeks. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | amoenus externus | PX1 FM Synth |
| --- | --- | --- |
| Price | **$2.99** | $7.99 |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/px1-fm-synth/id6785258298/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | — | Paid |
| Size | 8 MB | 121 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Erich Meier](https://appshunter.io/developer/1772450878) | [Peter Sjogren](https://appshunter.io/developer/1268263124) |

## What reviewers say

### amoenus externus

[App page](https://appshunter.io/ios/app/amoenus-externus/id6736566930)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### PX1 FM Synth

[App page](https://appshunter.io/ios/app/px1-fm-synth/id6785258298)

Create rich, wide stereo sounds with a dual-engine FM synthesizer. Explore classic 1980s digital synth tones, from electric pianos to metallic bells, with extensive operator and envelope controls. It functions as a standalone app or an AUv3 plugin for music production.

**Highlights:** Dual independent 6-operator FM engines, 32 classic FM algorithms, Per-operator envelopes and pan, Five macro knobs for sound shaping, Built-in reverb, AUv3 plugin support, Random patch generator

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is amoenus externus free?

amoenus externus costs $2.99, with no in-app purchases.

### Is PX1 FM Synth free?

PX1 FM Synth costs $7.99, with no in-app purchases.

### Do amoenus externus or PX1 FM Synth have ads?

Neither amoenus externus nor PX1 FM Synth shows ads.

### Which is updated more often, amoenus externus or PX1 FM Synth?

amoenus externus ships an update fortnightly, and PX1 FM Synth every 2 weeks. Most recently, amoenus externus was updated on October 30, 2026 and PX1 FM Synth on November 5, 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.*