Comparison

MIDI MACHINE vs HarmoTuner

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

MIDI MACHINE

Features
Read full description

MIDI MACHINE is a fast, playful performance tool built for generating MIDI melodies on the fly. At the heart of MIDI MACHINE are two creative states: SPARK and STRUCTURE. SPARK mode is all about discoveryβ€”rapidly generating fresh melodic ideas and happy accidents. 17 randomized melodic rows drawn from an vast internal library, everything is locked to your chosen key. Each melody is sliced into 10 playable parts, letting you remix and reshape ideas in real time without ever hitting a creative wall. STRUCTURE mode lets you compose and perform with intention and move seamlessly between key pairs to trigger chords. Additionally, genre-based chord-progression suggestions form a real progression from a selected genre, so you can play a coherent sequence. This mode is designed to serve users with and without knowledge of music theory. "Super inspiring tool for sketching melodies quickly, whether you’re in the studio or on the move with a minimal setup. You just start playing around and happy accidents happen."
— early user feedback Core Features * 17 MIDI melody rows per set, automatically harmonized to your chosen key * Each melody split into 10 playable tiles for real-time triggering of your favorite sounds * SPARK mode for instant idea generation and exploration * STRUCTURE mode for fixed chords mapped across key pairs, built in arpeggiator and chord group suggestions * Keep randomizing to generate endless new melodic combinations while keeping your settings * SAVE and recall full sets, including patterns, tempo, and performance modes (SPARK) * Note mode: trigger melodic sequences step-by-step * Chord mode: play full harmonies instantly * Loop ON / OFF: continuously cycle note sequences * Hold OFF: slide across tiles for fluid, continuous runs * Hold ON: trigger full sequences with a single tap * Repeat ON / OFF: retrigger tiles rhythmically (1/4 to 1/64) for pattern creation * Fixed velocity option for consistent dynamics * Edit individual tile MIDI sequences * Reverse entire rows * Octave shift up or down * Double or halve playback speed (Note mode) (STRUCTURE) * Group: Genre-based chord-progression suggestions. Highlights/labels tiles on the grid that form a real progression from the selected genre. * Arp: Turns a held chord into a rolling sequence of individual notes. β€’ Style – 16 note-order patterns (Up, Down, Converge, Pinky Up, Random, etc.). β€’ Rate – Speed of each note: 1/4 to 1/64, relative to BPM. β€’ Groove – Straight (default) or Swing 8/16/32 for a more human rhythmic feel. * Hold OFF: slide across tiles for fluid, continuous runs * Hold ON: trigger full sequences with a single tap * Add automatic Bass Note to each chord * Repeat ON / OFF: retrigger tiles rhythmically (1/4 to 1/64) for pattern creation * Fixed velocity option for consistent dynamics Performance Controls * Global pitch shift in semitones for instant transposition of the entire set * Adjustable BPM with tap tempo and fine control * Flexible visible row count (5–17) for compact or expanded layouts * Scrollable row view with FIRST ROW selection MIDI MACHINE is built for musicians who want a different approach to creating ideasβ€”fast, intuitive, and a little unpredictable. Whether you're sketching melodies or experimenting with generative patterns, it keeps everything playful, unique, and fun."

About

HarmoTuner

Features
Read full description

HarmoTuner is a tuner and metronome designed to help ensembles explore harmony through just intonation. Alongside precise single-note tuning, HarmoTuner lets you choose a target chord and compare the current position of each chord tone with its just-intonation target. Use it for individual long-tone practice or for shaping intonation and resonance in wind bands, orchestras, chamber groups, and other ensembles. CHORD TUNING Choose a target from 96 chords, including C, Am, G7, and CM7. HarmoTuner detects up to four input tones and displays a separate gauge for each role in the chord, such as the root, third, fifth, and seventh. In addition to the deviation from equal temperament, a target marker shows where each tone sits in just intonation. You can also find possible chords by selecting the note names you hear, making it easy to choose a target even when you do not know the chord symbol. SINGLE-NOTE TUNER View the note name, frequency, and deviation in cents from the selected reference in real time. β€’ Adjustable A4 reference pitch β€’ Equal temperament, just intonation, Pythagorean tuning, and meantone temperament β€’ Adjustable input sensitivity and lock sensitivity β€’ Lock indicator for a stable pitch β€’ Reference tone with selectable note and octave β€’ Analysis display for waveform and harmonic content Use it not only for tuning an instrument, but also for long tones and for checking the stability of embouchure and breath support. METRONOME Set the tempo, meter, and subdivision, then follow the beat through sound and visual feedback. β€’ 30–300 BPM β€’ Meters from 1/4 to 10/4 β€’ Quarter-note, eighth-note, triplet, and sixteenth-note subdivisions β€’ Tap tempo β€’ Tempo marking display β€’ Optional screen-edge beat flash Practice intonation and tempo without switching between apps. THREE FOCUSED MODES Open Tuner, Chord, or Metronome directly from its own tab. HarmoTuner remembers your most recently used mode and settings, so you can get back to practice quickly. PRIVACY All microphone input is analyzed on your device. HarmoTuner does not save recordings, transmit audio to external servers, or collect personal information.

Screenshots

MIDI MACHINE4 screens
HarmoTuner4 screens

Verdict

The call

The clearest difference is in-app purchases: HarmoTuner at none against MIDI MACHINE's 1. On price, update cadence, ads and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. MIDI MACHINE sells 1 one-off in-app purchase. HarmoTuner asks for nothing beyond the download.

UpkeepUpdate frequency

MIDI MACHINE ships an update weekly, HarmoTuner every 2 weeks. The most recent releases landed on September 19, 2026 and September 28, 2026 respectively.

Scorecard1 real difference Β· 5 level
MIDI MACHINE versus HarmoTuner: the parameters behind the verdict, then further details
ParameterMIDI MACHINEHarmoTuner
PriceFreeFree
Update frequencyWeekly β€” betterEvery 2 weeks
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.617.0 β€” better
Further details β€” not scored
Size52 MB1 MB
Age rating4+4+
DeveloperNiklas KoellnerShunsuke Hosomi

In-app purchases

1 purchases

MIDI MACHINE

One-time1
  • MIDI MACHINE Pro$4.99
None

HarmoTuner

No in-app purchases

Questions

Is MIDI MACHINE free?
MIDI MACHINE is free to download, with in-app purchases available.
Is HarmoTuner free?
HarmoTuner is free to download, with no in-app purchases.
Do MIDI MACHINE or HarmoTuner have ads?
Neither MIDI MACHINE nor HarmoTuner shows ads.
Which is updated more often, MIDI MACHINE or HarmoTuner?
MIDI MACHINE ships an update weekly, and HarmoTuner every 2 weeks. Most recently, MIDI MACHINE was updated on September 19, 2026 and HarmoTuner on September 28, 2026.

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