Chord NOTE vs Post
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Chord finding for melodies
- Chord Progression function
- Scale library
- Vocal pitch display
- Key finding
- iPad Split View/Slide Over support
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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/
Post
This app provides tools for analyzing post-tonal music, including pitch-class set and tone row calculations. It helps users identify Forte names, normal forms, prime forms, and relationships within musical sets.
- PC Set Calculator
- Subset/Superset Calculator
- Matrix Calculator
- Forte name analysis
- Normal form calculation
- Prime form identification
- Tone row analysis
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The Post-Tonal Tool Kit is designed to be a one-stop app for pitch-class and tone row analysis of post-tonal music. Features include a PC Set Calculator, a Subset/Superset Calculator, and a Matrix Calculator. –This app is perfect for the music theory student analyzing post-tonal music. –This app is also designed for the classroom and pedagogical uses. * With an Apple Dock Connector the screen can be projected in the classroom. * Analytical assignments can be designed to incorporate the features of the app that highlight relationships within sets and rows. The PC Set Calculator analyzes sets ranging from three to twelve pitches and provides: * Forte name * Normal form * Prime form * IC Vector * Z-Mate * Tn Invariance * TnI Invariance The calculator also will provide the inversion and complement sets with all the above information and all sets can be analyzed for subset and superset relationships (a very handy tool when analyzing Webern!). **WHAT’S NEW!!!** The Matrix Calculator will generate a matrix with any number of pitches up to twelve. The rows are numbered using the Straus/Roig-Francoli system (Introduction to Post-Tonal Theory/ Understanding Post-Tonal Music), where the P and I row labels correspond to the starting pitch class. Any number of pitch classes within the matrix can be highlighted and the selected set then sent back into the PC Set Calculator. This feature is extremely helpful when comparing trichords, tetrachords, and hexachords!
Screenshots
Verdict
The clearest difference is rating: Post at 4.3 against Chord NOTE's 3.0. Post also leads on in-app purchases (none vs 1) and chart position (#196 vs unranked). Chord NOTE's advantage is review sentiment (62% vs 50%) and price ($2.99 vs $4.99). On ratings volume, update cadence, 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
Chord NOTE costs $2.99 and Post $4.99 up front. Chord NOTE sells 1 one-off in-app purchase. Post asks for nothing beyond the download.
Post holds the better App Store score, 4.3 against 3.0. Both are backed by a comparable volume of ratings — 3 and 6 respectively. Written reviews complicate that: 62% of Chord NOTE's written reviews are positive against 50% of Post's, so the app with the better star average is not the one people write more warmly about.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 7, 2026 and August 9, 2026 respectively.
| Parameter | Chord NOTE | Post |
|---|---|---|
| Price | $2.99 — better | $4.99 |
| Rating | 3.0 (3 ratings) | 4.3 (6 ratings) — better |
| Positive reviews | 61.5% of reviews — better | 50.0% of reviews |
| Number of ratings | 3 | 6 — better |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Best chart rank | — | #196 — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 18.1 | 10.0 — better |
| Further details — not scored | ||
| Size | 31 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Hidenori Matsuoka | A Squared Applications |
Customer experience
Chord NOTE
Post
In-app purchases
Chord NOTE
- Advanced Option$1.99
Post
No in-app purchases









