# LadderTouchLite vs PeterJohn NumPy

The clearest difference is price: LadderTouchLite at Free against PeterJohn NumPy's $9.99. PeterJohn NumPy's advantage is update cadence (every 2 weeks vs every 2 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

LadderTouchLite is free to download; PeterJohn NumPy costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

LadderTouchLite ships an update every 2 months, PeterJohn NumPy every 2 weeks. The most recent releases landed on October 15, 2026 and August 14, 2026 respectively.

## The numbers

| Metric | LadderTouchLite | PeterJohn NumPy |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[4.7 (226 ratings)](https://appshunter.io/ios/app/laddertouchlite/id405695274/reviews)** | — |
| Number of ratings | **226** | — |
| Positive reviews | 88.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 6 MB | 222 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Motonari Hibi](https://appshunter.io/developer/386737172) | [Yasushi Obata](https://appshunter.io/developer/899977114) |

## What reviewers say

### LadderTouchLite

[App page](https://appshunter.io/ios/app/laddertouchlite/id405695274)

Learn the fundamentals of ladder logic, a graphical programming language, through interactive examples and quizzes. This app allows you to explore its mechanisms and test your comprehension with prepared exercises.

**Highlights:** Learn ladder logic basics, Execute prepared sample programs, Test understanding with questions, Control input signals, Utilize virtual outputs and internal memory, Configure timers and counters

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

**In-app purchases:** none


### PeterJohn NumPy

[App page](https://appshunter.io/ios/app/peterjohn-numpy/id1662896316)

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

**In-app purchases:** none


## Frequently asked questions

### Is LadderTouchLite free?

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

### Is PeterJohn NumPy free?

PeterJohn NumPy costs $9.99, with no in-app purchases.

### Do LadderTouchLite or PeterJohn NumPy have ads?

Neither LadderTouchLite nor PeterJohn NumPy shows ads.

### Which is updated more often, LadderTouchLite or PeterJohn NumPy?

LadderTouchLite ships an update every 2 months, and PeterJohn NumPy every 2 weeks. Most recently, LadderTouchLite was updated on October 15, 2026 and PeterJohn NumPy on August 14, 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.*