# SpaceTheremin vs Synthesizer Sim

The clearest difference is rating: SpaceTheremin at 4.8 against Synthesizer Sim's 4.2. SpaceTheremin also leads on in-app purchases (none vs 1) and ads (none vs shown). Synthesizer Sim's advantage is ratings volume (13 vs 4). On price, update cadence and device support there is nothing between them.

Both are free to download. Synthesizer Sim sells 1 one-off in-app purchase. SpaceTheremin asks for nothing beyond the download.

SpaceTheremin holds the better App Store score, 4.8 against 4.2. Both are backed by a comparable volume of ratings — 4 and 13 respectively.

SpaceTheremin ships an update every 2 months, Synthesizer Sim every 3 months. The most recent releases landed on September 18, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | SpaceTheremin | Synthesizer Sim |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/spacetheremin/id884417701/reviews)** | [4.2 (13 ratings)](https://appshunter.io/ios/app/synthesizer-sim/id6740828486/reviews) |
| Number of ratings | 4 | **13** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 6 MB | 53 MB |
| Requires iOS | **6.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [YUKIO ONOZUKA](https://appshunter.io/developer/876684692) | [Alper Kahriman](https://appshunter.io/developer/1054578352) |

## What reviewers say

### SpaceTheremin

[App page](https://appshunter.io/ios/app/spacetheremin/id884417701)

Create unique soundscapes by touching and moving your screen to control pitch and cosmic delay effects. Explore various wave shapes and warp options to craft your sonic experience. This app offers a free version with limited multi-touch and a pro version for an ad-free, expanded experience.

**Highlights:** Touch and move screen for pitch control, Cosmic delay sounds, Multi-touch support (2 free, more in pro), Adjustable delay time and feedback, Multiple wave shapes (Sine, Saw, Square, Triangle, Noise), Warp and Softness controls

**In-app purchases:** none


### Synthesizer Sim

[App page](https://appshunter.io/ios/app/synthesizer-sim/id6740828486)

This app transforms your device into a versatile music creation studio, offering a responsive synth keyboard and advanced sound design tools. Explore a wide range of sounds, record your performances, and share your music instantly. It supports MIDI input and includes rhythm tools for practice and live performance.

**Highlights:** Responsive synth keyboard, Advanced sound design engine, Built-in effects and modulation, MIDI keyboard support, Rhythm accompaniment and metronome, Performance recording and sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get Premium | $9.99 | one-time |


## Frequently asked questions

### Is SpaceTheremin free?

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

### Is Synthesizer Sim free?

Synthesizer Sim is free to download, with in-app purchases available.

### Which has better reviews, SpaceTheremin or Synthesizer Sim?

SpaceTheremin is rated higher. SpaceTheremin averages 4.8 out of 5 from 4 ratings, while Synthesizer Sim averages 4.2 from 13 ratings.

### Do SpaceTheremin or Synthesizer Sim have ads?

Synthesizer Sim shows ads; SpaceTheremin does not.

### Which is updated more often, SpaceTheremin or Synthesizer Sim?

SpaceTheremin ships an update every 2 months, and Synthesizer Sim every 3 months. Most recently, SpaceTheremin was updated on September 18, 2026 and Synthesizer Sim on October 8, 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.*