# Kusari vs Eishun

The clearest difference is iOS requirement: Kusari at 15.1 against Eishun's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Kusari sells 1 in-app purchase, starting at $29.99 per month and Eishun sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Kusari ships an update every 10 days, Eishun every 9 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Kusari | Eishun |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 123 MB | 6 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RYUTA ABE](https://appshunter.io/developer/1895880547) | [Starcrown Inc](https://appshunter.io/developer/1082624152) |

## What reviewers say

### Kusari

[App page](https://appshunter.io/ios/app/kusari/id6764690812)

This app uses behavioral economics to build a daily English learning habit. It employs a commitment device where users risk losing money if they miss their daily tasks, encouraging consistent practice through financial stakes rather than willpower. Daily activities include reading, shadowing, and AI conversation, taking 15-20 minutes.

**Highlights:** Commitment device with financial stakes, Daily reading, shadowing, and AI conversation, 15-20 minute daily tasks, Behavioral economics principles applied, Dynamic skill level adjustment (CEFR A1-C2), Tiered pricing based on daily achievement

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kusari Monthly | $29.99 | per month |


### Eishun

[App page](https://appshunter.io/ios/app/eishun-quick-english/id6766726944)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Eishun Pro | $3.99 | one-time |


## Frequently asked questions

### Is Kusari free?

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

### Is Eishun free?

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

### Do Kusari or Eishun have ads?

Neither Kusari nor Eishun shows ads.

### Which is updated more often, Kusari or Eishun?

Kusari ships an update every 10 days, and Eishun every 9 days. Most recently, Kusari was updated on October 31, 2026 and Eishun 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.*