# SpringSound vs RK

The clearest difference is price: RK at Free against SpringSound's $2.99. RK also leads on iOS requirement (13.2 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

RK is free to download; SpringSound costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | SpringSound | RK |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.2 (19 ratings)](https://appshunter.io/ios/app/springsound/id866583243/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 70.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | — |
| Monetization | Paid | — |
| Size | 30 MB | 1 MB |
| Requires iOS | 15.6 | **13.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Christophe Duquesne](https://appshunter.io/developer/647714834) | [Gerrit Dijkstra](https://appshunter.io/developer/437476213) |

## What reviewers say

### SpringSound

[App page](https://appshunter.io/ios/app/springsound/id866583243)

This app is a physical-modeling audio synthesizer that simulates sound through the interaction of springs, masses, and activators. It offers detailed control over various physical parameters and comes with a large library of presets. It can be used as a sound generator or effect, and supports MIDI and expressive controllers.

**Highlights:** Physical modeling sound synthesis, Detailed control of physical parameters, Large set of sound presets, Audio-In effect capability, MIDI and MPE support, iOS Continuum Remote integration

**Features:** macOS Compatibility

**In-app purchases:** none


### RK

[App page](https://appshunter.io/ios/app/rk-601/id6449847140)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SpringSound free?

SpringSound costs $2.99, with no in-app purchases.

### Is RK free?

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

### Do SpringSound or RK have ads?

Neither SpringSound nor RK 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.*