# MIDI Wrench

> MIDI Monitor & MIDI Controller

Canonical page: [https://chrome-stats.com/d/id589243566](https://chrome-stats.com/d/id589243566)

## Overview

- **ID:** `id589243566`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Christian Schoenebeck d/b/a Crudebyte
- **Category:** Music
- **Rating:** 4.60 / 5 (71 ratings)
- **Version:** 1.4
- **Last updated:** 2020-05-05
- **First published:** 2013-01-11
- **Size:** 21 MB
- **Data as of:** 2026-09-25
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/midi-wrench/id589243566)
- **Website:** [https://crudebyte.com/mobile/midi\_wrench/](https://crudebyte.com/mobile/midi_wrench/)
- **Privacy policy:** [https://crudebyte.com/mobile/privacy/](https://crudebyte.com/mobile/privacy/)

## Description

MIDI Wrench is the Swiss Army Knife for your daily MIDI tasks on iOS. Connect MIDI keyboards, sound expanders, or any CoreMIDI device using Apple adapters, and even Bluetooth LE MIDI. Visualize incoming MIDI events in real time, view all attached CoreMIDI devices and virtual ports, and diagnose MIDI setups quickly.

Send Note On/Off and Control Change messages via the virtual keyboard and on-screen controls, which automatically reflect device values. Fully configurable on-screen controls, event filtering, one-tap copy to clipboard, and a privacy-first, ad-free experience. Works with both hardware and software MIDI sources, with no data collection.

## Rankings

- #154,214 — Overall

## Review summary

MIDI Wrench is praised as a fast, lightweight, free MIDI diagnostic tool that shows real-time MIDI messages across diverse I/O and networks, helping users troubleshoot data flow and CC values. Reviewers love its simple UI and reliability for testing across devices. Major drawbacks are lack of audio output, occasional connection drops, and a desire for more features (patchbay, routing, ranges). Some note maintenance/compatibility expectations. Overall, it excels as a practical debugging aid for iPad-based MIDI workflows.

### Pros

- Excellent real-time MIDI data visibility for troubleshooting across multiple I/O setups (USB, Bluetooth, Wi‑Fi, virtual MIDI) and networks.
- Lightweight, fast, and simple to use with a clean interface and readable numeric readouts.
- Useful as a cross-device MIDI monitor that helps verify MIDI flow, CC values, and routing behavior.
- Includes practical latency/monitoring capabilities (echo feature) for testing timing.
- Free to use, making it an accessible diagnostic tool.

### Cons

- No built-in audio output; no sound from the piano keys, which makes testing audio paths harder.
- Occasional connection drops or background wake issues requiring relaunch.
- Feature set is limited; users want more (MIDI patchbay, key ranges/scales, USB/network MIDI out).
- Perceived maintenance concerns and compatibility updates for newer iOS versions.
- Primarily oriented toward iPad MIDI workflows, with limited use for other setups.

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Source: [Chrome-Stats](https://chrome-stats.com/d/id589243566)