Comparison

Chord NOTE vs MelodySlotMachine

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

Head to head
About

Chord NOTE

This app helps songwriters find chords that match melodies and provides tools for creating chord progressions. It also includes a scale library and can display vocal pitch to aid in composition.

Highlights
  • Chord finding for melodies
  • Chord Progression function
  • Scale library
  • Vocal pitch display
  • Key finding
  • iPad Split View/Slide Over support
Read full description

Chord NOTE is a Songwriter’s assistant tool. It assists in finding the right chords to match a melody or musical phrase. And it has great Chord Progression function and Scale library. Chord NOTE supports Slide Over and Split View on iPad, and provides the appropriate display and operation for iPhone and iPad. You wrote new melody came into your mind, but you could not apply some chords for your melody… At a time like this, you can get guides to find some chords that match your melody by Chord NOTE. If you have composed some songs already, you know almost melody and chord have some same notes. Because the main part of melody is made up of constituent notes of chord in most cases. In the same way, you’ll be able to find Key to match your melody by Chord NOTE. So Chord NOTE is very useful for finding the chord and key. If you record your singing melody, you can display the pitch of your voice. And you can sketch your songs by Chord Progression function. Chord Progression function will provide numerous features for you. Chord NOTE supports widening the imagination of your wings for real composer. Advanced Option : Chord NOTE works fine without this option. However, when you’ll buy this low price add-on, you can use more Chords and Scales. It will provide a complete set usually. You can read full function description at support page. http://therootage.com/iphone/chord-note-en/

About

MelodySlotMachine

Create new melody combinations by rearranging variations using slot dials. This AI-powered tool analyzes musical structure to generate new compositions, aiding composers in projects requiring many variations. Explore next-generation music production and consumption.

Highlights
  • Dial-based melody variation selection
  • Grid tile operation for timeline visualization
  • Melody shuffle via device shake
  • Song and part selection
  • AI-driven musical structure analysis
  • Next-generation music creation
Features
Read full description

Melody Slot Machine is an application developed by RIKEN towards the integration of music and AI. You can create new melody combinations by rearranging melody variations using slot dials. When the composer composes melody variations, the structure of the melody is analyzed using a theory of music known as generative theory of tonal music (GTTM). Even if the melody switches to another variation in the middle, the structure will not be disrupted. You can expand the possibilities of composition with Melody Slot Machine. - Dial operation By rotating the dials similar to a slot machine, you can select a melody from multiple variations. The dial scrolls to the left as the performance progresses, and the leftmost dial on the screen represents the score of the performance currently being played. - Grid tile operation The horizontal grid tiles below the dials show the dial changes throughout the song. Swipe up to expand and use the elongated grid tile. - Melody shuffle When you shake your iPhone, all the dials rotate simultaneously, similar to when you pull the lever on a slot machine and stop at a random combination. - Song selection / Part switching You can select a song by pressing the musical note button. For songs containing multiple parts, you can press the button to switch between parts. - Development history The Music Information Intelligence Team, part of the RIKEN Center for Advanced Intelligence Project, is exploring potential new ways of creating and listening to music using AI. The Melody Slot Machine is an example of next-generation music production and consumption in which AI automatically analyzes the structure of a melody and resynthesizes a new melody using the obtained structure. We aim to support composers in projects that require many variations, such as in movies and games. The app is available to the public to gauge the overall interest in such a method of music creation. We ask that users the app who are prompted to fill out a questionnaire to please submit their responses. We plan to add songs in the future. If you are interested in the app and technology, please contact us at the support URL.

Screenshots

Chord NOTE4 screens
MelodySlotMachine4 screens

Verdict

The call

The clearest difference is price: MelodySlotMachine at Free against Chord NOTE's $2.99. MelodySlotMachine also leads on rating (5.0 vs 3.0) and in-app purchases (none vs 1). Chord NOTE's advantage is ratings volume (3 vs 1). On ads 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

CostPrice · In-app purchases · Ads · Monetization

MelodySlotMachine is free to download; Chord NOTE costs $2.99 up front. Chord NOTE sells 1 one-off in-app purchase. MelodySlotMachine asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

MelodySlotMachine holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

UpkeepUpdate frequency

Chord NOTE ships an update every 2 months, MelodySlotMachine weekly. The most recent releases landed on October 17, 2026 and October 15, 2026 respectively.

Scorecard7 real differences · 3 level
Chord NOTE versus MelodySlotMachine: the parameters behind the verdict, then further details
ParameterChord NOTEMelodySlotMachine
Price$2.99Free — better
Rating3.0 (3 ratings)5.0 (1 ratings) — better
Positive reviews61.5% of reviews—
Number of ratings3 — better1
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.111.4 — better
Further details — not scored
Size31 MB192 MB
Age rating4+4+
DeveloperHidenori Matsuokanewforestar co,.ltd

Customer experience

Chord NOTE

All ratings3 ratings
Positive33.3%
Neutral33.3%
Negative33.3%
Written reviews13 reviews
Positive61.5%
Neutral23.1%
Negative15.4%

MelodySlotMachine

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Chord NOTE

One-time1
  • Advanced Option$1.99
None

MelodySlotMachine

No in-app purchases

Questions

Is Chord NOTE free?
Chord NOTE costs $2.99, and also offers in-app purchases.
Is MelodySlotMachine free?
MelodySlotMachine is free to download, with no in-app purchases.
Which has better reviews, Chord NOTE or MelodySlotMachine?
MelodySlotMachine is rated higher. Chord NOTE averages 3.0 out of 5 from 3 ratings, while MelodySlotMachine averages 5.0 from 1 ratings.
Do Chord NOTE or MelodySlotMachine have ads?
Neither Chord NOTE nor MelodySlotMachine shows ads.
Which is updated more often, Chord NOTE or MelodySlotMachine?
Chord NOTE ships an update every 2 months, and MelodySlotMachine weekly. Most recently, Chord NOTE was updated on October 17, 2026 and MelodySlotMachine on October 15, 2026.

Other comparisons