# PX1 FM Synth vs AD

The clearest difference is rating: PX1 FM Synth at 5.0 against AD's 4.7. AD's advantage is ratings volume (14 vs 2) and price ($6.99 vs $7.99). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

PX1 FM Synth costs $7.99 and AD $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PX1 FM Synth holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: AD has 14 ratings behind it against 2, so its average is the more settled of the two.

PX1 FM Synth ships an update every 2 weeks, AD every 3 weeks. Both last shipped on October 25, 2026.

## The numbers

| Metric | PX1 FM Synth | AD |
| --- | --- | --- |
| Price | $7.99 | **$6.99** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/px1-fm-synth/id6785258298/reviews)** | [4.7 (14 ratings)](https://appshunter.io/ios/app/ad-202/id6795327427/reviews) |
| Number of ratings | 2 | **14** |
| Positive reviews | — | 85.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Paid | Paid |
| Size | 121 MB | 74 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Peter Sjogren](https://appshunter.io/developer/1268263124) | [Audio Damage, Inc.](https://appshunter.io/developer/1248448317) |

## What reviewers say

### 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


### AD

[App page](https://appshunter.io/ios/app/ad-202/id6795327427)

This app emulates a classic 1983 micro synthesizer with modern enhancements like MPE and eight-voice polyphony. It offers a rich sound engine with multiple oscillators, filters, and a comprehensive drive section for unique sonic textures. Enjoy extensive modulation options and a built-in keyboard for immediate creativity.

**Highlights:** Eight-voice polyphony, MPE support, Classic four-pole lowpass filter, Comprehensive drive section, AUv3 and standalone operation, Preset manager with favorites, Built-in chicklet keyboard

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PX1 FM Synth free?

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

### Is AD free?

AD costs $6.99, with no in-app purchases.

### Which has better reviews, PX1 FM Synth or AD?

PX1 FM Synth is rated higher. PX1 FM Synth averages 5.0 out of 5 from 2 ratings, while AD averages 4.7 from 14 ratings.

### Do PX1 FM Synth or AD have ads?

Neither PX1 FM Synth nor AD shows ads.

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

PX1 FM Synth ships an update every 2 weeks, and AD every 3 weeks. Most recently, PX1 FM Synth was updated on October 25, 2026 and AD on October 25, 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.*