# Leapsy vs Kern

The clearest difference is in-app purchases: Leapsy at none against Kern's 3. Leapsy also leads on iOS requirement (12.4 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Kern sells 3 in-app purchases, starting at $3.99 per month. Leapsy asks for nothing beyond the download.

Leapsy ships an update every 5 weeks, Kern every 3 weeks. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Leapsy | Kern |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/kern-remember-what-you-read/id6777347570/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 30 MB | 23 MB |
| Requires iOS | **12.4** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Accent Languages](https://appshunter.io/developer/1733209739) | [Quantum IT](https://appshunter.io/developer/1650178784) |

## What reviewers say

### Leapsy

[App page](https://appshunter.io/ios/app/leapsy/id6478531600)

**Features:** macOS Compatibility

**In-app purchases:** none


### Kern

[App page](https://appshunter.io/ios/app/kern-remember-what-you-read/id6777347570)

This app helps you retain knowledge from books you've read by creating interactive flashcards. It uses spaced repetition to resurface information as it begins to fade, supporting both fiction and non-fiction content. Review your library offline and see an honest picture of what you remember.

**Highlights:** Spaced repetition flashcards, Supports fiction and non-fiction, Offline review capability, Interactive cards, No account required, Book fading visualization

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kern Plus (Monthly) | $3.99 | per month |
| Kern Plus (Annual) | $39.99 | per year |
| Unlock One Book | $1.99 | one-time |


## Frequently asked questions

### Is Leapsy free?

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

### Is Kern free?

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

### Do Leapsy or Kern have ads?

Neither Leapsy nor Kern shows ads.

### Which is updated more often, Leapsy or Kern?

Leapsy ships an update every 5 weeks, and Kern every 3 weeks. Most recently, Leapsy was updated on October 25, 2026 and Kern on October 31, 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.*