# LessonPad vs K

The clearest difference is price: K at Free against LessonPad's $15.99. K also leads on iOS requirement (14.0 vs 17.6). LessonPad's advantage is update cadence (every 6 weeks vs every 5 months). On ads, in-app purchases and device support there is nothing between them.

K is free to download; LessonPad costs $15.99 up front. Neither carries in-app purchases, so what you see is what you pay.

LessonPad ships an update every 6 weeks, K every 5 months. The most recent releases landed on September 21, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | LessonPad | K |
| --- | --- | --- |
| Price | $15.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 5 months |
| Size | 22 MB | 1 MB |
| Requires iOS | 17.6 | **14.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Newton Japan Inc.](https://appshunter.io/developer/286525140) | [SHIGERU OKADA](https://appshunter.io/developer/478571276) |

## What reviewers say

### LessonPad

[App page](https://appshunter.io/ios/app/lessonpad/id509685435)

**Features:** macOS Compatibility

**In-app purchases:** none


### K

[App page](https://appshunter.io/ios/app/k-kalc/id1557032391)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LessonPad free?

LessonPad costs $15.99, with no in-app purchases.

### Is K free?

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

### Do LessonPad or K have ads?

Neither LessonPad nor K shows ads.

### Which is updated more often, LessonPad or K?

LessonPad ships an update every 6 weeks, and K every 5 months. Most recently, LessonPad was updated on September 21, 2026 and K on May 16, 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.*