# WindSynth 16 vs ThereminAir

The clearest difference is price: WindSynth 16 at Free against ThereminAir's $3.99. ThereminAir's advantage is ads (none vs shown) and update cadence (every 11 days vs every 6 weeks). On in-app purchases and device support there is nothing between them.

WindSynth 16 is free to download; ThereminAir costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

WindSynth 16 ships an update every 6 weeks, ThereminAir every 11 days. The most recent releases landed on October 25, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | WindSynth 16 | ThereminAir |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/thereminair-theremin-synth/id6772935515/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 11 days** |
| Monetization | — | Free |
| Size | 35 MB | 2 MB |
| Requires iOS | 26.4 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Kouki Yoshimoto](https://appshunter.io/developer/1884780659) | [Tom Pardee](https://appshunter.io/developer/1882976406) |

## What reviewers say

### WindSynth 16

[App page](https://appshunter.io/ios/app/windsynth-16/id6766004505)

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

**In-app purchases:** none


### ThereminAir

[App page](https://appshunter.io/ios/app/thereminair-theremin-synth/id6772935515)

This app transforms your Apple Watch into a unique theremin instrument. Play music through arm gestures, controlling pitch and volume without touching any buttons. Explore different modes and scales to create a variety of sounds.

**Highlights:** Gesture-based pitch and volume control, Pure mode for continuous glide, Scale modes for staying in tune, Adjustable pitch ranges and vibrato depths, Live readout of frequency and note name, Complication for instant play

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is WindSynth 16 free?

WindSynth 16 is free to download, with no in-app purchases.

### Is ThereminAir free?

ThereminAir costs $3.99, with no in-app purchases.

### Do WindSynth 16 or ThereminAir have ads?

WindSynth 16 shows ads; ThereminAir does not.

### Which is updated more often, WindSynth 16 or ThereminAir?

WindSynth 16 ships an update every 6 weeks, and ThereminAir every 11 days. Most recently, WindSynth 16 was updated on October 25, 2026 and ThereminAir on October 11, 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.*