# N21NA vs 11+ Selective Thinking Skills

The clearest difference is in-app purchases: N21NA at none against 11+ Selective Thinking Skills's 4. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 11+ Selective Thinking Skills sells 4 in-app purchases, starting at $4.99 per month. N21NA asks for nothing beyond the download.

## The numbers

| Metric | N21NA | 11+ Selective Thinking Skills |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Size | 46 MB | 26 MB |
| Requires iOS | 13.4 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Network YwentyOne International, Inc](https://appshunter.io/developer/1376697534) | [FLY SKY PTY LTD](https://appshunter.io/developer/1838696534) |

## What reviewers say

### N21NA

[App page](https://appshunter.io/ios/app/n21na/id1128499897)

**In-app purchases:** none


### 11+ Selective Thinking Skills

[App page](https://appshunter.io/ios/app/11-plus-selective-thinking-skills/id6776193330)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Thinking Skills Pro | $4.99 | per month |
| Thinking Skills Full Access | $6.99 | per 7 days |
| Thinking Skills Pro | $14.99 | per year |
| Thinking Skills Full Access | $79.99 | one-time |


## Frequently asked questions

### Is N21NA free?

N21NA is free to download, with no in-app purchases.

### Is 11+ Selective Thinking Skills free?

11+ Selective Thinking Skills is free to download, with in-app purchases available.

### Do N21NA or 11+ Selective Thinking Skills have ads?

Neither N21NA nor 11+ Selective Thinking Skills shows ads.

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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.*