# Qithesizer vs RX

The clearest difference is in-app purchases: Qithesizer at none against RX's 1. RX's advantage is price ($9.99 vs $12.99). On update cadence, ads, device support and iOS requirement there is nothing between them.

Qithesizer costs $12.99 and RX $9.99 up front. RX sells 1 one-off in-app purchase. Qithesizer asks for nothing beyond the download.

Qithesizer ships an update fortnightly, RX weekly. The most recent releases landed on October 30, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Qithesizer | RX |
| --- | --- | --- |
| Price | $12.99 | **$9.99** |
| Rating | **[4.1 (11 ratings)](https://appshunter.io/ios/app/qithesizer/id6444722040/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 76.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Paid | — |
| Size | 29 MB | 25 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Robkoo Information & Technologies Co., Ltd.](https://appshunter.io/developer/987892941) | [sung ju KIM](https://appshunter.io/developer/6781333993) |

## What reviewers say

### Qithesizer

[App page](https://appshunter.io/ios/app/qithesizer/id6444722040)

This advanced music synthesizer combines virtual analog, wavetable, and physical modeling sound engines. It offers extensive modulation capabilities, a built-in sequencer, and on-screen keyboard for creating complex sounds.

**Highlights:** Multiple sound engines (virtual analog, wavetable, physical modeling), Extensive modulation sources and destinations, Full MIDI mapping, 16-step sequencer with pattern editor, Waveform and dynamic visualizations, On-screen keyboard

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

**In-app purchases:** none


### RX

[App page](https://appshunter.io/ios/app/rx-79/id6821795679)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SJ PACK | $5.99 | one-time |


## Frequently asked questions

### Is Qithesizer free?

Qithesizer costs $12.99, with no in-app purchases.

### Is RX free?

RX costs $9.99, and also offers in-app purchases.

### Do Qithesizer or RX have ads?

Neither Qithesizer nor RX shows ads.

### Which is updated more often, Qithesizer or RX?

Qithesizer ships an update fortnightly, and RX weekly. Most recently, Qithesizer was updated on October 30, 2026 and RX on October 29, 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.*