# Simple Cello vs ThereminAir

The clearest difference is price: Simple Cello at Free against ThereminAir's $3.99. Simple Cello also leads on iOS requirement (13.0 vs 17.0). ThereminAir's advantage is in-app purchases (none vs 1) and ads (none vs shown). On rating, ratings volume, update cadence and device support there is nothing between them.

Simple Cello is free to download; ThereminAir costs $3.99 up front. Simple Cello sells 1 one-off in-app purchase. ThereminAir asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Simple Cello against 5.0 for ThereminAir. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Simple Cello ships an update every 3 weeks, ThereminAir every 11 days. The most recent releases landed on October 28, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Simple Cello | ThereminAir |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/simple-cello/id6756935256/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/thereminair-theremin-synth/id6772935515/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 11 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 154 MB | 2 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Mustafa Demir](https://appshunter.io/developer/1204716531) | [Tom Pardee](https://appshunter.io/developer/1882976406) |

## What reviewers say

### Simple Cello

[App page](https://appshunter.io/ios/app/simple-cello/id6756935256)

Explore the expressive sound of the cello on your iPhone and iPad. This app offers various cello sound sets, practice songs with MIDI playback, rhythmic accompaniments, and a recording library for musical exploration.

**Highlights:** Multiple cello sound sets, MIDI playback with visual guide, Built-in practice songs, Rhythm and groove accompaniment, Recording and playback library, Adjustable playback speed

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get Premium | $4.99 | one-time |


### 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 Simple Cello free?

Simple Cello is free to download, with in-app purchases available.

### Is ThereminAir free?

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

### Which has better reviews, Simple Cello or ThereminAir?

Simple Cello and ThereminAir are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Simple Cello or ThereminAir have ads?

Simple Cello shows ads; ThereminAir does not.

### Which is updated more often, Simple Cello or ThereminAir?

Simple Cello ships an update every 3 weeks, and ThereminAir every 11 days. Most recently, Simple Cello was updated on October 28, 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.*