# RK vs RingsFX

The clearest difference is price: RK at Free against RingsFX's $14.99. RingsFX's advantage is review sentiment (100% vs 67%) and update cadence (fortnightly vs every 5 months). On rating, ads, in-app purchases and device support there is nothing between them.

RK is free to download; RingsFX costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for RK against 4.9 for RingsFX. Both are backed by a comparable volume of ratings — 9 and 27 respectively. Written reviews are what separate them: 67% of RK's written reviews are positive against 100% of RingsFX's.

RK ships an update every 5 months, RingsFX fortnightly. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | RK | RingsFX |
| --- | --- | --- |
| Price | **Free** | $14.99 |
| Rating | **[5.0 (9 ratings)](https://appshunter.io/ios/app/rk-006/id1516602717/reviews)** | [4.9 (27 ratings)](https://appshunter.io/ios/app/ringsfx/id6478013769/reviews) |
| Number of ratings | 9 | **27** |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Fortnightly** |
| Monetization | **Free** | Paid |
| Size | 3 MB | 23 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gerrit Dijkstra](https://appshunter.io/developer/437476213) | [4Pockets.com](https://appshunter.io/developer/370131860) |

## What reviewers say

### RK

[App page](https://appshunter.io/ios/app/rk-006/id1516602717)

Manage your RK006 Master Hub with this app. Design and save configurations, set up presets for event filtering, clock processing, and output modes. Connect your iOS device to MIDI, CV/Gate, and control it from your DAW.

**Highlights:** RK006 Master Hub management, MIDI, CV/Gate control, Preset design and saving, Event filtering, Clock processing, Output mode configuration

**Features:** macOS Compatibility

**In-app purchases:** none


### RingsFX

[App page](https://appshunter.io/ios/app/ringsfx/id6478013769)

This music app emulates a renowned physical modeling synthesizer, offering diverse synthesis techniques and polyphonic capabilities. It allows for real-time parameter manipulation and can process external audio, creating unique sonic textures and rhythms.

**Highlights:** Physical modeling synthesis emulation, Multiple polyphony modes (Mono, Duo, Quad, True Polyphonic), Supports MIDI MPE and velocity sensitivity, External audio excitation, Mod Matrix for real-time parameter control, 7 unique synthesis modes, 6 mod-able and 6 global effects

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

**In-app purchases:** none


## Frequently asked questions

### Is RK free?

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

### Is RingsFX free?

RingsFX costs $14.99, with no in-app purchases.

### Which has better reviews, RK or RingsFX?

RK is rated higher. RK averages 5.0 out of 5 from 9 ratings, while RingsFX averages 4.9 from 27 ratings.

### Do RK or RingsFX have ads?

Neither RK nor RingsFX shows ads.

### Which is updated more often, RK or RingsFX?

RK ships an update every 5 months, and RingsFX fortnightly. Most recently, RK was updated on October 24, 2026 and RingsFX 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.*