# Rotinsky — Serial composition calculator

> Serial composition calculator for hexachordal rotational arrays. (iPhone/iPad app by BJ Brooks.)

- Source: https://appshunter.io/ios/app/rotinsky/id1563850655 (this page in markdown: same URL + `.md`)
- Developer: [BJ Brooks](https://appshunter.io/developer/457276446)
- Category: Music, Music, Education
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.4 · 3 MB
- Languages: English
- Released: 2021-04-20
- Data updated: 2026-08-26
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/rotinsky/id1563850655/reviews.md

## What is Rotinsky?

The Rotinsky app is a Hexachordal Rotational Array calculator. The rotational arrays that are calculated are the Prime α, β, γ, δ; Retrograde γ, δ; Inversion γ, δ; and the Inversion of the retrograde γ, δ.

The app will allow for t and e substitution for 10 and 11 as well as eight display of integers, note names with flats or note names with sharps.

## Key features

- Hexachordal Rotational Array calculator
- Prime α, β, γ, δ arrays
- Retrograde γ, δ arrays
- Inversion γ, δ arrays
- Inversion of retrograde γ, δ arrays
- t and e substitution for 10 and 11
- Integer, flat, or sharp note name display

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/rotinsky/id1563850655/reviews.md

### 5/5 — A good start

*2021-12-18*

What are your plans with this app? Printing? Ability to play a row? Search? (i.e., “find rows with C-D-C#…”)

## Frequently asked questions about Rotinsky

### What is Rotinsky used for?

Rotinsky is a calculator for serial composition, specifically for generating hexachordal rotational arrays. It helps composers explore prime, retrograde, and inversion forms of musical series.

### What musical concepts does Rotinsky support?

Rotinsky supports hexachordal rotational arrays, including prime (α, β, γ, δ), retrograde (γ, δ), inversion (γ, δ), and inversion of retrograde (γ, δ). It also handles 't' and 'e' substitutions for 10 and 11.

### Can Rotinsky display notes with sharps or flats?

Yes, Rotinsky offers eight display options, including integers, note names with flats, and note names with sharps. This allows users to choose their preferred notation.

### What devices is Rotinsky available on?

Rotinsky is available for iPhone, iPad, and iPod. It is designed for iOS devices.

### How often is Rotinsky updated?

The latest version of Rotinsky is 1.1, which was last updated on January 26, 2022. The app was initially released on April 20, 2021.

### Does Rotinsky have ads?

No, Rotinsky does not contain advertisements. It is a completely ad-free application.

### What is the age rating for Rotinsky?

Rotinsky has an age rating of 4+. This indicates it is suitable for users of all ages.

### Is Rotinsky free to use?

Yes, Rotinsky is available for free. There are no costs associated with downloading or using the application.

## Version history (last 2 releases)

### 1.1 — 2022-01-26

Update to work on the new iOS.

### 1.0 — 2021-04-21

No release notes.

## Apps similar to Rotinsky

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Synthy](https://appshunter.io/ios/app/synthy/id6450637444) | 5.0 (1) | Free | Music |
| [Abstract Clock Tracks](https://appshunter.io/ios/app/abstract-clock-tracks/id1632353370) | 4.2 (5) | $1.99 | Music |
| [Impro Master](https://appshunter.io/ios/app/impro-master/id1552035106) | 4.6 (46) | Free | Music |

## More apps by BJ Brooks

- [Tap The Matrix 2](https://appshunter.io/ios/app/tap-the-matrix-2/id1561469759)
- [Sound or Sight](https://appshunter.io/ios/app/sound-or-sight/id6740222470)

All apps by BJ Brooks: https://appshunter.io/developer/457276446

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*