# iSequence HD vs CalmusNotation

The clearest difference is review sentiment: iSequence HD at 77% against CalmusNotation's 0%. iSequence HD also leads on ratings volume (33 vs 5). CalmusNotation's advantage is in-app purchases (none vs 8) and rating (4.4 vs 4.2). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. iSequence HD sells 8 one-off in-app purchases. CalmusNotation asks for nothing beyond the download.

CalmusNotation holds the better App Store score, 4.4 against 4.2. That said, the two scores are not equally well evidenced: iSequence HD has 33 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 77% of iSequence HD's written reviews are positive against 0% of CalmusNotation's, so the app with the better star average is not the one people write more warmly about.

iSequence HD ships an update every 3 months, CalmusNotation every 4 months. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | iSequence HD | CalmusNotation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (33 ratings)](https://appshunter.io/ios/app/isequence-hd/id369873168/reviews) | **[4.4 (5 ratings)](https://appshunter.io/ios/app/calmusnotation/id993026661/reviews)** |
| Number of ratings | **33** | 5 |
| Positive reviews | **76.6% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 156 MB | 294 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [BeepStreet](https://appshunter.io/developer/321412321) | [Erki-tonlist sf](https://appshunter.io/developer/929321904) |

## What reviewers say

### iSequence HD

[App page](https://appshunter.io/ios/app/isequence-hd/id369873168)

Create professional music on your iPad with an intuitive 8-track sequencer, a vast library of instruments, and flexible mixing with DSP effects. Record, edit, and arrange loops, beats, and melodies in real-time, controlling every aspect of your music project.

**Highlights:** 8-track sequencer, 160+ built-in instruments, Custom instrument sampler, Real-time recording and automation, Step sequencer and FX editor, Flexible mixer with DSP effects, Wi-Fi file sharing

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Funny farm bank | $1.99 | one-time |
| Chiptunes bank | $1.99 | one-time |
| Acoustic bank | $2.99 | one-time |
| Electro/house bank | $2.99 | one-time |
| Trance waves | $2.99 | one-time |
| Loops vol.1 | $2.99 | one-time |
| Loops vol.2 | $2.99 | one-time |
| Beat elements bank | $2.99 | one-time |

**What reviewers like**

- 🚀 Powerful sequencer
- 👍 Intuitive interface
- 🎨 Great sound quality
- 💰 Good value for money
- 🎶 Excellent for music creation

**What reviewers complain about**

- 🐛 Crashes and stability issues
- 🔇 Limited audio export options
- 🔒 Lack of Audiobus/Inter-App Audio support
- 🔢 Limited track count
- 🔀 Difficulty with time signatures and polyrhythms

**Reported bugs**

- Crashes on startup or during use
- Issues with sample loading and playback
- Inconsistent behavior with certain features
- Compatibility problems with newer iOS versions

**Requested features**

- Expanded track count
- More effects and sound design capabilities
- Audiobus and Inter-App Audio integration
- Improved sample import and management
- Support for more time signatures and rhythms


### CalmusNotation

[App page](https://appshunter.io/ios/app/calmusnotation/id993026661)

Create and visualize musical compositions using AI-powered graphical notation. This app leverages advanced AI, inspired by NASA's Lisp programming, to generate original music based on user input and can display music from other compatible apps for live performance.

**Highlights:** AI-powered music composition, Graphical notation display, Real-time performance visualization, Lisp-based AI engine, User input-driven music creation, Integration with CalmusComposer and CalmusPlay

**In-app purchases:** none


## Frequently asked questions

### Is iSequence HD free?

iSequence HD is free to download, with in-app purchases available.

### Is CalmusNotation free?

CalmusNotation is free to download, with no in-app purchases.

### Which has better reviews, iSequence HD or CalmusNotation?

CalmusNotation is rated higher. iSequence HD averages 4.2 out of 5 from 33 ratings, while CalmusNotation averages 4.4 from 5 ratings.

### Do iSequence HD or CalmusNotation have ads?

Neither iSequence HD nor CalmusNotation shows ads.

### Which is updated more often, iSequence HD or CalmusNotation?

iSequence HD ships an update every 3 months, and CalmusNotation every 4 months. Most recently, iSequence HD was updated on October 14, 2026 and CalmusNotation on October 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*