# RK-006 — RK-006 Master Hub Manager > Manager app for RK006 Master Hub, handling MIDI, CV/Gate, and configurations. (iPhone/iPad app by Gerrit Dijkstra.) - Source: https://appshunter.io/ios/app/rk-006/id1516602717 (this page in markdown: same URL + `.md`) - Developer: [Gerrit Dijkstra](https://appshunter.io/developer/437476213) - Category: Music, Entertainment - Price: Free - Rating: 5.00/5 from 9 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 13.0 · 3 MB - Languages: English - Released: 2020-06-06 - Data updated: 2026-07-31 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/rk-006/id1516602717/reviews.md ## What is RK? This is the manager-app for the RK006 Master Hub. The RK006 features a 12 bus(yes, 12x16 channel MIDI Handling) MIDI Interface and and ultra stable MIDI clock generator. It can MIDI merge from it's two TRS-A MIDI Inputs and even add four self-hosted USBMIDI devices to the stream. It is able to connect your iOS device not only to MIDI but also act as a CV/Gate source with control straight from your DAW. Add extensive MIDI filters and even built-in polychaining to make this the go-to tool for any setup. This app is an iOS port from the online webMIDI portal. It allows you to design and save configurations in the RK006. Via this app you can setup presets which can handle event filtering, clock processing and RK006 port output modes (MIDI/Gate/CV) Some review snippets: "The RK006 is a game changer, making sync, MIDI and signal processing easy, even without a DAW." (juno.co.uk) "Retrokits prove themselves invaluable once again to our increasingly complex and confusing desktop hardware setups." (gearnews.com) "Incredibly versatile hub for MIDI, USB and modular, and probably the only MIDI interface you’ll ever need in or out of the studio." (Sound on Sound) ## Key features - RK006 Master Hub management - MIDI, CV/Gate control - Preset design and saving - Event filtering - Clock processing - Output mode configuration ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/rk-006/id1516602717/reviews.md ### 5/5 — Retrokits is UNDERRATED BRILLIANCE *2025-07-14, version 2.09* Everything this company makes, wether it be hardware or apps are absolutely some of the best mini midi/audio products on the market. A small boutique company producing absolute gems. They hit the nail on the head with everything that I’ve tried! RK-008, RK-006, TRS and DIN5 dongles; have been game changers in my setup. Give this company your money and support small businesses innovating and modernizing the features we need and want. Portable and studio setups rejoice!!!! Thanks Retrokits! ### 5/5 — Retrokits is top notch in every way possible! *2024-01-14, version 1.9* What a great company & products! Highly recommended! ### 3/5 — Not Currently working ios14 *2020-09-28* Great app for the rk006 but it currently crashs on open on ios14 ## Frequently asked questions about RK ### What is RK-006? RK-006 is a manager app for the RK006 Master Hub, a device featuring a 12-bus MIDI interface, stable MIDI clock generator, and CV/Gate output capabilities. ### Can RK-006 be used without a DAW? Yes, the RK-006 Master Hub can handle sync, MIDI, and signal processing easily, even without a DAW, as noted by reviews. ### What platforms does RK-006 support? RK-006 is available for iPhone, iPad, and iPod, as indicated by its supported devices list. ### How often is RK-006 updated? The latest version of RK-006 is 2.09, and it was last updated on April 19, 2025, suggesting regular updates. ### What is the user sentiment for RK-006? Reviews suggest RK-006 is considered a game-changer and incredibly versatile, proving invaluable for complex setups. ### Is RK-006 free to use? Yes, RK-006 is available for free and does not have any in-app purchases or advertisements. ### What kind of MIDI handling does RK-006 offer? RK-006 supports 12x16 channel MIDI handling, MIDI merging from two TRS-A inputs, and can add four self-hosted USB MIDI devices. ### Does RK-006 have ads? No, RK-006 is ad-free, meaning you can manage your RK006 Master Hub without any interruptions from advertisements. ## Version history (last 5 releases) ### 2.09 — 2025-04-19 In this update: * A small change to the RK006 MIDI filters: They now also apply to ports set to gate mode. * Opening the RK002 / RK006 manual links have been fixed. ### 2.07 — 2024-05-30 More per port midi filtering available and a fix on gate/cv modes ### 2.0 — 2024-01-18 The new 2.0 version adds more specific filtering ont each of the 5 available filter blocks. If you target a filter on specific MIDI channels you can now choose which specific MIDI Channel Message to filter out (notes, controllers, pitchbend, program change or aftertouch). ### 1.9 — 2023-12-23 -More USB Id's added for easier MIDI filter creation. -Recognise the RK008 as BT MIDI Interface for controlling the RK006 wirelessly ### 1.8 — 2023-06-21 -Added more USB ID's for filter targets. -Added more options for per port start/stop messages/ -You can also configure the RK006 through the WIDI BT dongle. ## Apps similar to RK | App | Rating | Price | Category | | --- | --- | --- | --- | | [M8C](https://appshunter.io/ios/app/m8c/id6746388495) | 5.0 (11) | Free | Music | | [RingsFX](https://appshunter.io/ios/app/ringsfx/id6478013769) | 4.9 (25) | $14.99 | Music | | [apeMatrix](https://appshunter.io/ios/app/apematrix/id1378343729) | 4.6 (82) | $14.99 | Music | | [ID700](https://appshunter.io/ios/app/id700/id1482698043) | 4.8 (125) | $12.99 | Music | | [Mass - MIDI Generator](https://appshunter.io/ios/app/mass-midi-generator/id6498471263) | 5.0 (10) | $9.99 | Music | | [Troublemaker](https://appshunter.io/ios/app/troublemaker/id1180892130) | 4.6 (64) | $8.99 | Music | ## More apps by Gerrit Dijkstra - [RK-004](https://appshunter.io/ios/app/rk-004/id1184337550) - [RK-601](https://appshunter.io/ios/app/rk-601/id6449847140) All apps by Gerrit Dijkstra: https://appshunter.io/developer/437476213 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-31.*