# Kusari vs いつでも英語脳

The clearest difference is price: Kusari at Free against いつでも英語脳's $2.99. Kusari also leads on update cadence (every 10 days vs every 6 weeks) and iOS requirement (15.1 vs 18.0). いつでも英語脳's advantage is in-app purchases (none vs 1). On review sentiment, ads and device support there is nothing between them.

Kusari is free to download; いつでも英語脳 costs $2.99 up front. Kusari sells 1 in-app purchase, starting at $29.99 per month. いつでも英語脳 asks for nothing beyond the download.

Kusari ships an update every 10 days, いつでも英語脳 every 6 weeks. The most recent releases landed on October 7, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Kusari | いつでも英語脳 |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 6 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 123 MB | 8 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [RYUTA ABE](https://appshunter.io/developer/1895880547) | [Yodai Kadokawa](https://appshunter.io/developer/6798598113) |

## 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 |


### いつでも英語脳

[App page](https://appshunter.io/ios/app/id6798598111)

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

**In-app purchases:** none


## Frequently asked questions

### Is Kusari free?

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

### Is いつでも英語脳 free?

いつでも英語脳 costs $2.99, with no in-app purchases.

### Do Kusari or いつでも英語脳 have ads?

Neither Kusari nor いつでも英語脳 shows ads.

### Which is updated more often, Kusari or いつでも英語脳?

Kusari ships an update every 10 days, and いつでも英語脳 every 6 weeks. Most recently, Kusari was updated on October 7, 2026 and いつでも英語脳 on October 29, 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.*