# いつでも英語脳 vs Sumflash

The clearest difference is price: Sumflash at Free against いつでも英語脳's $2.99. いつでも英語脳's advantage is in-app purchases (none vs 1) and ads (none vs shown). On update cadence, device support and iOS requirement there is nothing between them.

Sumflash is free to download; いつでも英語脳 costs $2.99 up front. Sumflash sells 1 in-app purchase, starting at $1.99 per month. いつでも英語脳 asks for nothing beyond the download.

いつでも英語脳 ships an update every 6 days, Sumflash every 3 days. The most recent releases landed on October 19, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | いつでも英語脳 | Sumflash |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 days | **Every 3 days** |
| Size | 8 MB | 14 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Yodai Kadokawa](https://appshunter.io/developer/6798598113) | [Toru Fukui](https://appshunter.io/developer/1888097145) |

## What reviewers say

### いつでも英語脳

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Sumflash

[App page](https://appshunter.io/ios/app/sumflash-mental-math-flash/id6816003975)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Monthly) | $1.99 | per month |


## Frequently asked questions

### Is いつでも英語脳 free?

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

### Is Sumflash free?

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

### Do いつでも英語脳 or Sumflash have ads?

Sumflash shows ads; いつでも英語脳 does not.

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

いつでも英語脳 ships an update every 6 days, and Sumflash every 3 days. Most recently, いつでも英語脳 was updated on October 19, 2026 and Sumflash on October 6, 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.*