# Simply Read Notes vs CTCB OnDemand

The clearest difference is update cadence: CTCB OnDemand at every 5 weeks against Simply Read Notes's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Simply Read Notes sells 8 in-app purchases, starting at $0.99 per 7 days and CTCB OnDemand sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Simply Read Notes ships an update every 3 months, CTCB OnDemand every 5 weeks. The most recent releases landed on September 18, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Simply Read Notes | CTCB OnDemand |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/simply-read-notes/id6505057767/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 101 MB | 110 MB |
| Requires iOS | **15.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Frederic Nagler](https://appshunter.io/developer/1693577034) | [Counter Terrorism Certification Board Pte Ltd](https://appshunter.io/developer/1895109584) |

## What reviewers say

### Simply Read Notes

[App page](https://appshunter.io/ios/app/simply-read-notes/id6505057767)

Master music notation with this comprehensive educational tool. It offers guided learning and customizable exercises to improve your sight-reading skills across various clefs and difficulty levels. Daily challenges and progress tracking help you become an ace note reader.

**Highlights:** Guided learning program, Customizable manual exercises, Multiple clef support, Daily challenges, Progressive difficulty adaptation, Three language options for notes

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Subscription Weekly | $0.99 | per 7 days |
| Pro Subscription Monthly | $2.99 | per month |
| Pro Subscription Yearly | $29.99 | per year |
| Small Gem Pack | $0.99 | one-time |
| Raise Gem Limit | $2.99 | one-time |
| Medium Gem Pack | $4.99 | one-time |
| Large Gem Pack | $9.99 | one-time |
| Full version | $9.99 | one-time |


### CTCB OnDemand

[App page](https://appshunter.io/ios/app/ctcb-ondemand/id6762985900)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Terrorism Fundamentals | $59.00 | one-time |
| Second Generation CPTED | $59.00 | one-time |
| TVRA course | $59.00 | one-time |
| Investigative Interview | $59.00 | one-time |
| Kidnap, Ransom and Extortion | $59.00 | one-time |
| Physical Detection Systems | $59.00 | one-time |
| Physical Access Control System | $59.00 | one-time |
| Physical Security Concepts | $59.00 | one-time |
| Perimeter Intrusion Detection | $59.00 | one-time |
| CCTV & Video Surveillance | $59.00 | one-time |


## Frequently asked questions

### Is Simply Read Notes free?

Simply Read Notes is free to download, with in-app purchases available.

### Is CTCB OnDemand free?

CTCB OnDemand is free to download, with in-app purchases available.

### Do Simply Read Notes or CTCB OnDemand have ads?

Neither Simply Read Notes nor CTCB OnDemand shows ads.

### Which is updated more often, Simply Read Notes or CTCB OnDemand?

Simply Read Notes ships an update every 3 months, and CTCB OnDemand every 5 weeks. Most recently, Simply Read Notes was updated on September 18, 2026 and CTCB OnDemand on September 20, 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.*