# Midiflow — MIDI Router and Processor > App-to-app MIDI router and processor with advanced filtering and remapping. (iPhone/iPad app by Johannes Doerr.) - Source: https://appshunter.io/ios/app/midiflow/id879915554 (this page in markdown: same URL + `.md`) - Developer: [Johannes Doerr](https://appshunter.io/developer/622204117) - Category: Music, Productivity - Price: $7.99 with in-app purchases - Rating: 4.00/5 from 39 App Store ratings · 119 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 4 MB - Languages: American English - Released: 2014-06-22 - Data updated: 2026-08-31 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/midiflow/id879915554/reviews.md ## What is Midiflow? Midiflow allows you to send MIDI from app to app in a similar way to what you already do with audio. That way, you can sync apps with each other or send MIDI parts from a sequencer app to different synth apps. You can also route the MIDI from your keyboard to apps and assign different key zones to them. Different settings can be stored as a preset, recalled later and inserted into another preset. Furthermore, all MIDI transfer can be monitored in order to find problems or just to learn what MIDI is doing (normally) behind the scenes. Important news: There is a full documentation on the Midiflow website now! HOW DOES IT WORK? Midiflow allows you to create multiple routings. Each routing receives MIDI data on its source and sends it to its destination. The selectable sources and destinations include your CoreMIDI compatible MIDI interface and other apps if they provide a virtual MIDI port. You can also create custom ports that can be used by other apps to receive data from Midiflow or send data to it. A routing also has a modifier which allows you to filter data or modify it. That way, you can transpose notes, limit them to a key range, change the MIDI channel of the incoming data, etc. (see the feature list below). LIST OF FEATURES + MIDI clock – specify tempo and your apps will be in sync + Channel filtering and remapping + Velocity filtering – a routing is only active for notes in a given velocity range + Note shift – shift all notes by a given number of half-tone steps + Note remapping – shift each note individually + Velocity remapping – apply a velocity curve, transform to fixed velocity, or specify the map value by value. In the latter case, you can also export the mapping to the clipboard, edit it in another app like Apple Numbers, and paste it back in Midiflow + Filtering out Clock or dividing the tempo into subdivisions + Filtering out SysEx + Connect to other iPads/iPhones via Bluetooth MIDI (iOS8 or higher) + Save a configuration as a preset, which can be recalled later or inserted into another preset + Custom virtual MIDI ports, which can be selected in other apps as a source or destination + Control aspects of Midiflow via MIDI. For example, select presets or control the clock with any MIDI command + Launch your synth apps from Midiflow (works with an increasing number of apps) + Sharing your configurations ADDITIONAL FEATURES (available as an In-app purchase) + Filtering and remapping of controllers – transform (a) the controller type, e.g. from CC1 to pitch-bend or note value to CC1, and (b) transform the value in several ways: as a linear remapping from an input range to an output range, as a curve, or as a value by value list. In the latter case, you can also export the mapping to the clipboard, edit it in another app like Apple Numbers, and paste it back in Midiflow. This allows you to create very sophisticated remappings. + Controller conditions – adjust your routings depending on other MIDI messages. This allows you to create sophisticated behavior within your setup by switching routings on and off. DOES MIDIFLOW WORK WITH MY SYNTH APPS? Midiflow works with every app that has a correct MIDI implementation. In the best case, it has an own virtual MIDI port and can be configured so that it receives MIDI only on that port. Unfortunately, some apps don't have that, but can at least be restricted to one MIDI channel. In that case, you can send to that channel on the global MIDI port "Network Session 1". If you can't select a channel either, then the app won't work with Midiflow. There is a tutorial video on www.midiflow.com that explains this in more detail. ## Key features - App-to-app MIDI routing - MIDI clock synchronization - Channel filtering and remapping - Note and velocity manipulation - Custom virtual MIDI ports - Preset saving and recall - Controller filtering and remapping (in-app purchase) ## Pricing and in-app purchases Base price: $7.99. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Controller Remapping | $3.99 | one-time | | Controller Conditions | $2.99 | one-time | | Send Controller On Load | $1.99 | one-time | ## What do users think of Midiflow? Overall sentiment: mixed **Pros** - 👍 Comprehensive MIDI routing - 💡 Flexible MIDI manipulation - 🚀 Powerful functionality - ✨ Intuitive interface (for some) - ✅ Works in background - 🛠️ Good for complex setups - 🔄 Constantly updated (historically) - 📚 Well-documented - 💡 Re-maps MIDI messages - 💡 Splits/layers sounds - 💡 Controls external gear - 💡 Essential for MIDI setups - 💡 Connects old to new MIDI - 💡 Solves MIDI keyboard issues - 💡 Ultimate MIDI command center - 💡 Great for live performance - 💡 Swiss Army knife of MIDI - 💡 Breathes life into synths - 💡 Best MIDI workflow reroute - 💡 Solves MIDI problems - 💡 Useful for live sound - 💡 Easy to use - 💡 Essential MIDI tool - 💡 Inspires creativity - 💡 Professional and complete - 💡 Missing link for MIDI - 💡 Elegant and useful - 💡 Incredible potential - 💡 Excellent MIDI app - 💡 Solid live MIDI solution - 💡 Fantastic MIDI router - 💡 Great product - 💡 Very useful - 💡 Nicely done interface - 💡 Brilliant MIDI software - 💡 Outstanding app - 💡 Good stuff - 💡 Easy routing - 💡 Powerful utility - 💡 Very versatile - 💡 Works flawlessly **Cons** - 🐛 Frequent crashes - 🐛 App doesn't open - 🐛 App closes immediately - 🐛 Bugs and quirks - 🐛 Unreliable for live use - 🐛 Layout issues - 🐛 Navigation problems - 🐛 No response from support - 🐛 Forum is dead/locked - 🐛 In-app purchases complex - 🐛 Does not work with AUM - 🐛 Pricing too complicated - 🐛 Note off velocities ignored - 🐛 Crashes during editing - 🐛 Edits lost after crash - 🐛 Backup song lost - 🐛 Does not work with GarageBand - 🐛 MIDI splitter issues - 🐛 No back/cancel button - 🐛 Crashes when searching devices - 🐛 Not working with iOS 14 - 🐛 Not working with iOS 15 - 🐛 Not working with iOS 16 - 🐛 Inconsistent MIDI implementation - 🐛 Some IAPs not in bundle - 🐛 Overpriced - 🐛 Interface a mess - 🐛 Not logical - 🐛 Does not record to GarageBand - 🐛 Does not work with SampleTank in background - 🐛 Remapping doesn't work - 🐛 Bluetooth connectivity crashes - 🐛 CC mapping issues - 🐛 Does not pass release velocity - 🐛 App appears abandoned - 🐛 Disingenuous standalone description - 🐛 Requires further payment - 🐛 Support is impossible - 🐛 No acknowledgment of help requests - 🐛 Forum sign-up prevents requests - 🐛 Ignored questions on forum - 🐛 Rip off - 🐛 Wasted money - 🐛 Can't do what I want - 🐛 Not compatible with iOS 8/10 - 🐛 No dark mode - 🐛 Some MIDI messages blocked/morphed - 🐛 Remapping adds code, doesn't replace - 🐛 Limited usefulness - 🐛 Many IAPs - 🐛 Some apps don't work - 🐛 No MIDI input selection in SampleTank - 🐛 Fixed MIDI channels in Korg iPolysix - 🐛 Does not work with Arturia iMini/iProphet - 🐛 Needs to be universal app - 🐛 Some functions need buying - 🐛 Stopped using it - 🐛 App shutdown on iPad 2 - 🐛 Doesn't search nearby devices - 🐛 Force closes on remapping - 🐛 GUI problems - 🐛 $11 dollars wasted - 🐛 App doesn't load after paid updates - 🐛 No return button - 🐛 Layout issues on iPhone - 🐛 Filter out Note Off messages missing - 🐛 Frequent crashes while editing - 🐛 Mapped CCs dropped during performance - 🐛 Incomplete standalone app - 🐛 No AUv3 plugin version **Commonly reported bugs** - Frequent crashes while editing CC map - Mapped CCs dropped during performance - App does not open on iOS 10 - Layout issues on iPhone 11 (no 'Done' button) - App stops working, opens for 2 seconds then closes - Bug in Velocity remapping: 'Reset curve' makes screen blank - Note Off messages have vel value = 0 - App simply doesn't start after paid updates - No 'Done' or 'Back' button visible in menus - App crashes when editing a song and saving - Edits lost after crash - Backup song lost after crash - App crashes when trying to remap - App crashes on first note when Roli Seaboard is connected - App closes when searching for nearby devices - App closes when selecting 'find nearby devices' or 'advertise device' - App doesn't work with iOS 14 - App doesn't work with iOS 15 - App doesn't work with iOS 16 - App crashes on iPad 5 after update - App closes immediately after starting - No back or cancel button, stuck in menus - CC control mapping issues (e.g., CC7 dropped) - Bluetooth connectivity crashes the app - Program Change to MIDI note remapping not working - App doesn't search for nearby devices - App force closes when remapping - GUI problems with returning to main page - App crashes on first note - App doesn't load after paid updates - No return button - Layout issues on iPhone - Filter out Note Off messages functionality missing - Frequent crashes while editing - Mapped CCs dropped during performance - Note off velocities are ignored - App doesn't open - App closes immediately - App doesn't work with SampleTank in background - Remapping doesn't work properly - MIDI messages blocked or morphed - Remapping adds code instead of replacing - Fixed MIDI channels in Korg iPolysix - Does not work with Arturia iMini/iProphet - App shutdown on iPad 2 **Most requested features** - AUv3 plugin version - Mass sharing of songs - Dark mode - Ability to map multiple notes from one key press - Individual transpose for split zones - More MIDI features controllable by external hardware ## Recent user reviews (10 of 119) All indexed reviews: https://appshunter.io/ios/app/midiflow/id879915554/reviews.md ### 1/5 — Apps impossible to connect in midi *2026-07-31* This app that is not free, pretending to connect apps between them, didn't work for me. None of my apps containing midi would appear when i used the search console. I don't know if there is a list or whatever. Didn't work for me. ### 5/5 — 唯一的功能全面midi路由转换软件 *2026-04-03* 非常好用. very good. 希望作者能开发出AUv3插件版. i hope there is an AUv3 version. ### 3/5 — Let down by poor support *2026-02-27* The software appears to be comprehensive, with few other apps working on iOS 15 filling this need. Although the standalone app is a disingenuous description, its not complete and requires further payment for other key aspects. Unfortunately trying to get support on how to use it is impossible. There’s no acknowledgment of requests for help by email. Signing up to the forum does not allow requests to be made and there are a significant number of very good questions completely ignored on the forum. Get it if you know what you’re doing otherwise look elsewhere. ### 1/5 — Não funciona!!! *2026-01-18* Porque a loja fica mantendo esse aplicativo ativo se ele não funciona mais. Comprei essa semana, gastei R$ 40 e não funciona. Favor devolver o dinheiro investido. ### 1/5 — Funktionslos *2025-12-03* Ich habe keine Funktion entdecken können, auch nicht mit kostenpflichtigem add-on. Besitze ein iPad Air von 2025. ### 2/5 — Frequent crashes *2025-11-15* Good features, but the app crashed several times while editing the CC map, and some of the mapped CCs are dropped during performance, making it overall unreliable for live usage. ### 1/5 — Not working after in app purchases *2025-09-11* Just did 2 in app purchases and app stopped working after that ### 1/5 — Rip off *2025-03-18* Does not work as advertised and support appears to be non-existent. ### 1/5 — Nem abre *2025-03-09* Diz que é compatível com iOS 8 mas no iOS 10 sequer abre. 40 pratas gastas para nada. ### 4/5 — Note On 0 zu Note Off fehlt noch *2025-01-31* Gute App, allerdings vermisse ich noch einen Note ON mit Velocity 0 zu Note OFF Translator. Viele iPad Apps kränkeln leider an dieser Stelle und interpretieren Note ONs mit Velocity 0 nicht als Note OFF. Oder habe ich‘s nur übersehen…? ## Frequently asked questions about Midiflow ### What does Midiflow do? Midiflow acts as a MIDI router and processor, allowing you to send MIDI data between different applications on your device. This enables features like synchronizing apps with each other, sending MIDI from sequencer apps to synth apps, and routing MIDI from a keyboard with custom key zones. ### What are the key features of Midiflow? Key features include MIDI clock synchronization for tempo matching, channel filtering and remapping, velocity filtering, note shifting and remapping, and the ability to create custom virtual MIDI ports for other apps. You can also save and recall configurations as presets. ### Is Midiflow free to use? The core functionality of Midiflow is available for free. However, advanced features such as filtering and remapping of controllers are available as an in-app purchase, offering more sophisticated MIDI manipulation capabilities. ### What are the use cases for Midiflow? Midiflow is useful for synchronizing multiple music apps, sending MIDI data from a sequencer to various synth apps, assigning different key zones on a MIDI keyboard to specific apps, and generally managing and processing MIDI signals between different software instruments and controllers. ### What devices is Midiflow compatible with? Midiflow is designed for iOS devices. It supports connecting to other iPads/iPhones via Bluetooth MIDI, which requires iOS 8 or higher. It also works with CoreMIDI compatible MIDI interfaces. ## Version history (last 5 releases) ### 2.2.20 — 2024-05-08 Compatibility improvements for recent iOS versions ### 2.2.19 — 2021-03-22 Stability improvements ### 2.2.18 — 2021-02-23 Stability improvements ### 2.2.17 — 2020-09-29 Compatibility with iOS 14 ### 2.2.15 — 2018-09-27 - Fixed issue with remappings of type "message" ## Apps similar to Midiflow | App | Rating | Price | Category | | --- | --- | --- | --- | | [OCTACHRON MIDI Drum Sequencer](https://appshunter.io/ios/app/octachron-midi-drum-sequencer/id1453137215) | 4.5 (104) | $9.99 | Music | | [Xequence 2](https://appshunter.io/ios/app/xequence-2/id1464669442) | 4.6 (65) | $19.99 | Music | | [SWAM Violin](https://appshunter.io/ios/app/swam-violin/id1458132239) | 4.1 (14) | $29.99 | Music | | [SampleTank](https://appshunter.io/ios/app/sampletank/id464783893) | 2.7 (107) | $24.99 | Music | | [MidiMixer for AUM Auv3 Plugin](https://appshunter.io/ios/app/midimixer-for-aum-auv3-plugin/id1542209150) | 4.7 (26) | $9.99 | Music | | [Quantiloop Pro - Live Looper](https://appshunter.io/ios/app/quantiloop-pro-live-looper/id1156213359) | 4.9 (201) | $14.99 | Music | ## More apps by Johannes Doerr - [iMIDIPatchbay](https://appshunter.io/ios/app/imidipatchbay/id622204114) - [English is Easy – Learn vocabulary with pictures and sound](https://appshunter.io/ios/app/english-is-easy-learn-vocabulary-with-pictures-and-sound/id1056841728) - [Midiflow Keyboard (Audiobus)](https://appshunter.io/ios/app/midiflow-keyboard-audiobus/id1092870508) - [Midiflow Splitter (Audiobus)](https://appshunter.io/ios/app/midiflow-splitter-audiobus/id1104669188) - [Midiflow Limiter (Audiobus)](https://appshunter.io/ios/app/midiflow-limiter-audiobus/id1107244412) All apps by Johannes Doerr: https://appshunter.io/developer/622204117 --- *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 2026-08-31.*