# Dear Aunt Sally vs 11+ Selective Thinking Skills

The clearest difference is in-app purchases: Dear Aunt Sally at none against 11+ Selective Thinking Skills's 4. 11+ Selective Thinking Skills's advantage is iOS requirement (13.0 vs 16.0). On price, ads and device support 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. Dear Aunt Sally asks for nothing beyond the download.

## The numbers

| Metric | Dear Aunt Sally | 11+ Selective Thinking Skills |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/dear-aunt-sally/id1577087345/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Free | — |
| Size | 17 MB | 26 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Neil Rohan](https://appshunter.io/developer/1522614743) | [FLY SKY PTY LTD](https://appshunter.io/developer/1838696534) |

## What reviewers say

### Dear Aunt Sally

[App page](https://appshunter.io/ios/app/dear-aunt-sally/id1577087345)

This app teaches the order of operations (PEMDAS) using interactive modes. It helps students and programmers understand mathematical expression solving step-by-step, with a quiz feature for practice.

**Highlights:** Step-by-step expression analysis, Shunt Yard algorithm explanation, SOLVE mode for freehand entry, QUIZ mode with random expression generation, Stack/Queue dynamics visualization, Customizable quiz parameters

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

**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 Dear Aunt Sally free?

Dear Aunt Sally 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 Dear Aunt Sally or 11+ Selective Thinking Skills have ads?

Neither Dear Aunt Sally nor 11+ Selective Thinking Skills shows ads.

---

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