MIDIWriter

MIDIWriter

Turn Text into MIDI/Sound Tool

2 ratings
3 reviews
$0.99

Details

  • Released
  • Updated
  • April 25, 2012
  • July 4, 2026

Features

MIDIWriter video #1 for iPhone
MIDIWriter screenshot #2 for iPhone
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MIDIWriter screenshot #4 for iPhone
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MIDIWriter screenshot #6 for iPhone
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About

This app transforms keyboard input into musical notes and sounds. Type characters to instantly generate MIDI messages, or input phrases to create musical sequences with adjustable tempo and looping. It includes a built-in sound engine and supports external MIDI devices and apps.

Text to MIDI conversion
Built-in General MIDI sound engine
Phrase playback with tempo control
Drum mode with multiple kits
External MIDI output
Hardware keyboard support
Wi-Fi MIDI networking
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What's New in MIDIWriter

2.0.1

July 4, 2026

Minor bugs have been fixed.

User reviews

Glad it’s Only 99 cents

This is a great idea, and it could be very useful if it worked better and was recognized by more music apps, like AUM. My MIDI keyboard has a limited number of buttons and other controls on it, so this would be useful for sending program change and other MIDI messages.

The description says the last support for this thing was 4 years ago. Another reviewer said it looks like it was put up here and then forgotten; I agree. It’s too bad; this app is a good idea that didn’t pan out...
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Not quite fun enough to be a toy

A buck isn't much money, but I don't think I got a dollar's worth of pleasure out of this. There's no way of knowing what note will get played when a key is depressed, and no way to specify or control that. Also, the app starts in a mode in which each key typed produces a note (again, you get no control of the note's duration), but if keyboard focus is ever once given to the text field, you're stuck in a "batch" mode from then on, and can't get back to the key-by-key mode.

It's sort of a pity, because — viewed as a proof of concept exercise — it's actually a potentially interesting idea, and might allow the use of an external bluetooth keyboard (for instance) to quickly audition the sounds of a MIDI synthesizer, without either setting up any external MIDI hardware, nor using the on-screen keyboard within the synthesizer app. As it is, it seems that the developer just got something more-or-less working, and then "threw it out there" to see if anybody would pay for it. Well, I did pay for it, but would encourage you not to.

To summarize, it's not all that much fun to play with after the first 20 seconds or so, when it's been established that typing a key can, in fact, cause a sound to be played. And although the fun value is limited, the app's use for more than that is non-existant.
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Umm...

Very little documentation, no way to adjust settings, holding a key sends a rapid signal instead of a sustain. I tried this with animoog, and the number keys gave me middle notes while EVERY OTHER KEY was at the high end of the scale — so there really isn't much range for this.

Fancy idea, but not really executed well. Hope they develop it more.
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Developer apps

FAQ

How does MIDIWriter turn text into music?

MIDIWriter converts each character you type into MIDI note messages. These messages are then interpreted by its built-in sound engine or can be sent to external MIDI-compatible apps or devices, producing sound based on the character's code.

What instruments are available in MIDIWriter?

MIDIWriter features a built-in General MIDI sound engine with 128 instruments and 9 drum kits. This allows for a wide variety of sounds directly within the app without needing external sound modules.

Can I play MIDIWriter on my Mac?

Yes, MIDIWriter supports MIDI Network Session over Wi-Fi. You can connect your iPhone or iPad to your Mac and use MIDIWriter to control CoreMIDI-compatible sound generators remotely on your Mac.

Does MIDIWriter have ads?

No, MIDIWriter does not contain advertisements. It is a paid application that offers an ad-free experience for its users.

What is the price of MIDIWriter?

MIDIWriter is available for a one-time purchase of $0.99. This grants you full access to all its features without any additional in-app purchases or subscriptions.

What devices does MIDIWriter support?

MIDIWriter is designed for both iPhone and iPad, supporting both portrait and landscape orientations. It also offers full support for light and dark modes.

How often is MIDIWriter updated?

The latest version of MIDIWriter is 2.0, released on February 3, 2026. While the release date is in the future, indicating potential for updates, historical update frequency is not detailed.

What is the age rating for MIDIWriter?

MIDIWriter has an age rating of 4+. This indicates it is suitable for children and adults, with no mature content present in the application.