# MIDI Check - Diagnose Tool — Check-up your MIDI Connection

> Diagnose and manage MIDI connections and messages on iOS devices. (iPhone/iPad app by DejaWorks LTD.)

- Source: https://appshunter.io/ios/app/midi-check-diagnose-tool/id1235759917 (this page in markdown: same URL + `.md`)
- Developer: [DejaWorks LTD](https://appshunter.io/developer/1051410230)
- Category: Music, Productivity
- Price: $1.99 (on sale, was $2.99)
- Rating: 4.00/5 from 4 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.3 · 35 MB
- Languages: American English
- Released: 2017-05-16
- Data updated: 2026-07-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/midi-check-diagnose-tool/id1235759917/reviews.md

## What is MIDI Check?

*Diagnose The Problem & Find the Solution*

Current Features:
+ See/detect, hardware/virtual  active MIDI connections.
+ See all incoming messages.
+ Send test notes on/off and control messages.
+ MIDI Channel filter: Eliminate messages comes from unwanted MIDI channels.
+ MIDI Message filter: Eliminate unwanted messages (e.g. Note on, Note off, Pitch wheel etc.)
+ MIDI System Exclusive filter: Eliminate MIDI Clock and many other  unwanted MIDI messages.
+ MIDI Delta-Time Added: See the time spent between messages
+ Record Incoming MIDI messages in background mode
+ 100% vectoriel cristal clear gorgeous  user interface.
+ Slide the glass through the face, activate the desired filter with a gesture.


**NOTE**
Yamaha Bluetooth MD-BT01 users -> According to Yamaha user manual; all MIDI related application should be closed before bluetooth midi connection. Run the MIDI Check after connection established. If not you'll not be able to see the Yamaha midi connection on the app. This is not an application's issue. Because Yamaha use own BT protocol.

Upcoming Features:
- Music keyboard improvement.
- Custom preset message send possibility.

## Key features

- Detect active MIDI connections
- View incoming MIDI messages
- Send test MIDI notes and control messages
- Filter MIDI channels and messages
- Filter MIDI System Exclusive messages
- Record MIDI messages in background mode

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/midi-check-diagnose-tool/id1235759917/reviews.md

### 1/5 — No instructions

*2021-12-28*

Good thing this only cost $2. There are no instructions and nothing indicates that it’s getting a midi signal whether Bluetooth or wired even though I am getting a signal with Midi Wrench. Basically useless for me.

## Frequently asked questions about MIDI Check

### What does MIDI Check do?

MIDI Check helps you diagnose and manage your MIDI connections. It allows you to see active hardware and virtual MIDI connections, monitor all incoming messages, and filter out unwanted data.

### Can MIDI Check record MIDI messages?

Yes, MIDI Check can record incoming MIDI messages in background mode. This feature allows you to capture MIDI data even when the app is not actively in the foreground.

### How does MIDI Check handle unwanted MIDI messages?

MIDI Check offers robust filtering capabilities. You can filter messages by MIDI channel, specific message types (like Note On/Off), and even MIDI System Exclusive messages, including MIDI Clock.

### Is MIDI Check compatible with Yamaha Bluetooth MD-BT01?

Yes, but users of the Yamaha Bluetooth MD-BT01 need to follow specific steps. According to Yamaha's manual, all other MIDI applications should be closed before establishing the Bluetooth MIDI connection. Run MIDI Check after the connection is established to ensure it's detected.

### What is the user interface like in MIDI Check?

MIDI Check features a 100% vectoriel, crystal clear, and gorgeous user interface. You can interact with it by sliding your finger across the screen to activate desired filters with gestures.

### What devices does MIDI Check support?

MIDI Check is supported on iPhone, iPad, and iPod. It is designed to work across a range of Apple mobile devices.

### How often is MIDI Check updated?

The latest version of MIDI Check is 2.0.8, last updated on June 30, 2020. While updates may not be frequent, the app is stable and functional for its intended purpose.

### Does MIDI Check have ads?

No, MIDI Check does not contain advertisements. The app is ad-free, providing an uninterrupted user experience.

## Version history (last 5 releases)

### 2.0.8 — 2020-06-30

This update covers some major changes.
+Dark mode is available for iOS13 users. 
+UI Optimisation:  Especially for iPhone  X and other devices.
+Send MIDI message: To all selected (or single) output destinations.
+Receive MIDI message: From all selected (or single) input sources
+Bug fix: No more crash while incoming MIDI messages.
+Timestamp is added,  Delta time is removed.
+MIDI Send tab is renewed.
+Now everything is faster than before.

### 1.7.3 — 2018-06-07

+ Visual improvements for iPad and iPhone Plus devices.
+ Fix: Background mode back again.

### 1.7.0 — 2018-06-05

+NEW "System Exclusive" message filter added. 
+Now MIDI Clock can be filtered, no more crazy scrolling!
+DeltaTime column added. Now, you can see the time difference between the MIDI notes and messages.
+Design optimised for iPhone X compatibility.

### 1.6.6 — 2017-10-11

+ MIDI Channel filter added: Eliminate messages comes from unwanted MIDI channels.
+ MIDI Message filter added: Eliminate unwanted channel and control messages (e.g. Note on, Note off, Pitch wheel etc.)
+ iOS 11 Compatibility updated.

### 1.3.9 — 2017-05-25

+ MIDI Device Connection Info & Tips tab has been added. Some devices need some tips to connect in ease, now it's available in the MIDI Check!
+ Piano keyboard stability improved. (Rarely it could stick on a pressed note, fixed.)

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All apps by DejaWorks LTD: https://appshunter.io/developer/1051410230

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*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 2026-07-04.*