# WTR Notebook vs 11x13

The clearest difference is price: 11x13 at Free against WTR Notebook's $4.99. 11x13 also leads on update cadence (every 2 weeks vs every 2 months). WTR Notebook's advantage is in-app purchases (none vs 2) and iOS requirement (11.0 vs 15.6). On ads and device support there is nothing between them.

11x13 is free to download; WTR Notebook costs $4.99 up front. 11x13 sells 2 in-app purchases, starting at $0.99 per month. WTR Notebook asks for nothing beyond the download.

WTR Notebook ships an update every 2 months, 11x13 every 2 weeks. The most recent releases landed on October 14, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | WTR Notebook | 11x13 |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 14 MB | 3 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Digitalt Hjarta AB](https://appshunter.io/developer/886129484) | [Matthias Hennemeyer](https://appshunter.io/developer/352918135) |

## What reviewers say

### WTR Notebook

[App page](https://appshunter.io/ios/app/wtr-notebook/id1019261013)

**Features:** macOS Compatibility

**In-app purchases:** none


### 11x13

[App page](https://appshunter.io/ios/app/11x13/id1345978316)

This app offers daily math practice to improve number familiarity and overcome math reservations. It focuses on basic arithmetic operations with visual progress tracking through charts and grids. Daily practice sessions can enhance fundamental mathematical skills.

**Highlights:** Daily math practice, Basic arithmetic operations, Progress visualization, Personalized calculation levels, Leaderboard integration, Number range grids

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Everything – monthly | $0.99 | per month |
| Everything | $5.99 | one-time |


## Frequently asked questions

### Is WTR Notebook free?

WTR Notebook costs $4.99, with no in-app purchases.

### Is 11x13 free?

11x13 is free to download, with in-app purchases available.

### Do WTR Notebook or 11x13 have ads?

Neither WTR Notebook nor 11x13 shows ads.

### Which is updated more often, WTR Notebook or 11x13?

WTR Notebook ships an update every 2 months, and 11x13 every 2 weeks. Most recently, WTR Notebook was updated on October 14, 2026 and 11x13 on October 12, 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.*