# Challenge Multiplication vs Notra

The clearest difference is in-app purchases: Challenge Multiplication at none against Notra's 2. Challenge Multiplication also leads on device support (3 vs 1). Notra's advantage is update cadence (every 10 days vs every 9 months). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Notra sells 2 in-app purchases, starting at $8.99 per month. Challenge Multiplication asks for nothing beyond the download.

Challenge Multiplication ships an update every 9 months, Notra every 10 days. The most recent releases landed on October 5, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Challenge Multiplication | Notra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 10 days** |
| Size | 18 MB | 56 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Cyril ANDRE](https://appshunter.io/developer/1652227485) | [Eclozion](https://appshunter.io/developer/6774210829) |

## What reviewers say

### Challenge Multiplication

[App page](https://appshunter.io/ios/app/challenge-multiplication/id6743617103)

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

**In-app purchases:** none


### Notra

[App page](https://appshunter.io/ios/app/notra-ai-study-notes/id6803191039)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Notra Pro Monthly | $8.99 | per month |
| Notra Pro Yearly | $59.99 | per year |


## Frequently asked questions

### Is Challenge Multiplication free?

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

### Is Notra free?

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

### Do Challenge Multiplication or Notra have ads?

Neither Challenge Multiplication nor Notra shows ads.

### Which is updated more often, Challenge Multiplication or Notra?

Challenge Multiplication ships an update every 9 months, and Notra every 10 days. Most recently, Challenge Multiplication was updated on October 5, 2026 and Notra on October 11, 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.*