# AudioKit Synth One Synthesizer vs 4

The clearest difference is price: AudioKit Synth One Synthesizer at Free against 4's $1.99. AudioKit Synth One Synthesizer also leads on iOS requirement (13.0 vs 26.2). On ads, in-app purchases and device support there is nothing between them.

AudioKit Synth One Synthesizer is free to download; 4 costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | AudioKit Synth One Synthesizer | 4 |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.9 (27K ratings)](https://appshunter.io/ios/app/audiokit-synth-one-synthesizer/id1371050497/reviews)** | — |
| Number of ratings | **27K** | — |
| Positive reviews | 94.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | — |
| Monetization | Free | — |
| Size | 34 MB | 11 MB |
| Requires iOS | **13.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AudioKit Pro](https://appshunter.io/developer/1307785645) | [eiki yonemoto](https://appshunter.io/developer/1814352569) |

## What reviewers say

### AudioKit Synth One Synthesizer

[App page](https://appshunter.io/ios/app/audiokit-synth-one-synthesizer/id1371050497)

This is a free, open-source professional synthesizer app for iOS devices. It offers over 300 presets, MIDI support, a sequencer, and vintage-inspired filters. Learn music production basics and create your own sounds.

**Highlights:** Over 300+ Presets, MIDI Support, Vintage-Style Sequencer, Analog Filters, Expressive Arpeggiators, Open-Source

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 😎 Easy to use
- 🔥 Clean patches
- 👍 Awesome synth
- 🎸 Works great with GarageBand
- 🤩 Absolutely stunning

**What reviewers complain about**

- 🤔 No AU support yet
- 🤔 Crashes with Audiobus 3
- 🤔 Poor palette of sounds
- 🤔 Mod wheel issues
- 🤔 Occasional crashes

**Reported bugs**

- Login screen freezes
- Incompatible with older devices
- Keyboard issues on iPhone
- Crashes with Audiobus 3
- Mod wheel issues

**Requested features**

- Add AU support
- Add just intonation feature
- Add dotted-8th-note delay option
- Add more sound packs
- Add drum machine/sequencing capabilities


### 4

[App page](https://appshunter.io/ios/app/4-pad-sampler/id6760901053)

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

**In-app purchases:** none


## Frequently asked questions

### Is AudioKit Synth One Synthesizer free?

AudioKit Synth One Synthesizer is free to download, with no in-app purchases.

### Is 4 free?

4 costs $1.99, with no in-app purchases.

### Do AudioKit Synth One Synthesizer or 4 have ads?

Neither AudioKit Synth One Synthesizer nor 4 shows ads.

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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.*