MIDIWriter vs MF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MIDIWriter
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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[[ A STRANGE MUSIC TOOL FOR MANIAC MUSIC LOVERS! ]] MIDIWriter is a unique app that converts keyboard input into MIDI note messages. Each character you type instantly produces sound. You can also enter a phrase and play it back as a sequence with adjustable tempo and loop options. KEY FEATURES: Built-in Sound Engine: No external app required! MIDIWriter includes a built-in General MIDI sound engine with 128 instruments and 9 drum kits. Just type and hear the sound immediately. Phrase Playback: Enter any text and play it as a musical sequence. Adjust the tempo (1-480 BPM), enable loop mode, and let your words become music. Space characters can be used as rests. Drum Mode: Switch to drum mode to play percussion sounds. Choose from 9 GM drum kits including Standard, Room, Power, Electronic, 808/909, Jazz, Brush, and Orchestral. MIDI Output: Send MIDI to other apps or external devices. Configure MIDI channel (1-16), program change (0-127), and destination. Works with Virtual MIDI and MIDI Network Session. Can be used simultaneously with the built-in sound engine. Keyboard Support: Use the on-screen software keyboard, or connect a Bluetooth/USB hardware keyboard for a real typing experience. Supports Japanese input with proper IME handling. MIDI Network Session: Connect to Mac or other iOS devices over Wi-Fi to control CoreMIDI-compatible sound generators remotely. Dark Mode & Rotation: Full support for light and dark modes. Works in portrait and landscape orientations on both iPhone and iPad. Note: Playback stops when the app goes to background. Using the Built-in Sound: Simply launch MIDIWriter and start typing. Each key produces a unique sound based on its character code. Enable drum mode in Settings for percussion sounds. Using with External MIDI Apps (Virtual MIDI): 1. Open a CoreMIDI sound generator app. 2. In MIDIWriter Settings, turn on "MIDI Output" and select the destination. 3. Type any key to hear sound from the external app. Using with Mac (MIDI Network Session): 1. Connect iPhone and Mac to the same Wi-Fi network. 2. Open MIDIWriter on iPhone. 3. On Mac, open "Audio MIDI Setup" and configure Network MIDI. 4. Connect your iPhone to the session. 5. Open a CoreMIDI app on Mac and select the network session as MIDI input. 6. Type on MIDIWriter to play sounds on Mac. Credits: Built-in sound engine uses "GeneralUser GS" SoundFont by S. Christian Collins. https://schristiancollins.com/generaluser.php
MF
This app is a digital recreation of a classic analog lowpass filter effect pedal. It allows users to add dynamic motion and warm, vibrant tones to various audio sources like guitars, vocals, and synthesizers.
- Analog 4-pole lowpass filter emulation
- Envelope follower for dynamic motion
- Processes guitar, voice, and synths
- AUv3 effects plugin
- Warm and vibrant sound quality
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The MF-101S Lowpass Filter is a re-invention of Moog Music’s classic Moogerfooger MF-101 analog effects pedal. The hardware MF-101 Lowpass Filter, introduced in 1998, contained two complete modular functions: a classic, all-analog 4-pole Lowpass Filter paired with an envelope follower to impart dynamic motion to the filtered sound. Designed by Bob Moog and his engineering team, the MF-101 was a direct descendant of the original Moog modular synthesizers, adapted to process, modulate, and play with inputs ranging from guitar, voice, and synthesizer to any imaginable audio source. The MF-101 Lowpass Filter has been meticulously recreated as the MF-101S, capturing not only the warm and vibrant sound of the original, but also the organic way in which the parameters interact to create a musical playing experience. The MF-101S is an AUv3 effects plug-in that requires a compatible host or DAW to function.
Screenshots
Verdict
The clearest difference is review sentiment: MF at 50% against MIDIWriter's 0%. MF also leads on rating (4.6 vs 1.5) and update cadence (monthly vs every 35 months). MIDIWriter's advantage is price ($0.99 vs $14.99). On ads, in-app purchases, monetization model and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
MIDIWriter costs $0.99 and MF $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
MF holds the better App Store score, 4.6 against 1.5. Both are backed by a comparable volume of ratings — 2 and 9 respectively. Written reviews point the same way: 0% of MIDIWriter's written reviews are positive against 50% of MF's.
MIDIWriter ships an update every 35 months, MF monthly. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.
| Parameter | MIDIWriter | MF |
|---|---|---|
| Price | $0.99 — better | $14.99 |
| Rating | 1.5 (2 ratings) | 4.6 (9 ratings) — better |
| Positive reviews | 0.0% of reviews | 50.0% of reviews — better |
| Number of ratings | 2 | 9 — better |
| Update frequency | Every 35 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 31 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Masayuki Akamatsu | Moog Music Inc. |
Customer experience
MIDIWriter
MF
In-app purchases
MIDIWriter
No in-app purchases
MF
No in-app purchases









