# Creta Class vs こくご水族館

The clearest difference is iOS requirement: Creta Class at 13.0 against こくご水族館's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Creta Class sells 10 in-app purchases, starting at $14.99 per month and こくご水族館 sells 11 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Creta Class ships an update fortnightly, こくご水族館 every 10 days. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Creta Class | こくご水族館 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (92 ratings)](https://appshunter.io/ios/app/creta-class/id1583359669/reviews)** | — |
| Number of ratings | **92** | — |
| Positive reviews | 64.4% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 10 days** |
| Monetization | Free with in-app purchases | — |
| Size | 200 MB | 35 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AMAZING EDTECH PTE. LTD.](https://appshunter.io/developer/1597060777) | [Kosuke Mawatari](https://appshunter.io/developer/1489564137) |

## What reviewers say

### Creta Class

[App page](https://appshunter.io/ios/app/creta-class/id1583359669)

This math program for children aged 3-8 offers a fun and engaging way to learn. Developed by experts, it features a systematic curriculum with interactive lessons, animations, and exercises. AI-powered personalized learning paths ensure kids acquire essential math skills and competencies.

**Highlights:** AI-powered personalized learning paths, Interactive lessons and exercises, Systematic curriculum for ages 3-8, Develops logical reasoning and problem-solving, Bite-sized daily sessions, Ad-free and safe environment

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan for Old  User | $14.99 | per month |
| Monthly Plan | $14.99 | per month |
| Monthly Plan for  Referral | $14.99 | per month |
| Monthly Plan | $18.99 | per month |
| 月間プラン | $30.99 | per month |
| Yearly Plan for Old User | $399.99 | per year |
| Yearly Plan | $399.99 | per year |
| 1 Unit-DF | $18.99 | one-time |
| 1 Unit | $18.99 | one-time |
| 1 Unit | $34.99 | one-time |


### こくご水族館

[App page](https://appshunter.io/ios/app/id6800643489)

**Features:** macOS Compatibility

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| すべての単元 遊び放題(月額) | $1.99 | per month |
| すべての単元 遊び放題(年額) | $19.99 | per year |
| どこにかいてある?① ぜんぶあそぶ | $0.99 | one-time |
| どこにかいてある?② ぜんぶあそぶ | $0.99 | one-time |
| かせんをさがそう ぜんぶあそぶ | $0.99 | one-time |
| ひらがなさがし ぜんぶあそぶ | $0.99 | one-time |
| ひらがな聞き取り ぜんぶあそぶ | $0.99 | one-time |
| カタカナ聞き取り ぜんぶあそぶ | $0.99 | one-time |
| 1ねんせいの漢字 ぜんぶあそぶ | $0.99 | one-time |
| 2ねんせいの漢字 ぜんぶあそぶ | $0.99 | one-time |
| よみとり① ぜんぶあそぶ | $0.99 | one-time |


## Frequently asked questions

### Is Creta Class free?

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

### Is こくご水族館 free?

こくご水族館 is free to download, with in-app purchases available.

### Do Creta Class or こくご水族館 have ads?

Neither Creta Class nor こくご水族館 shows ads.

### Which is updated more often, Creta Class or こくご水族館?

Creta Class ships an update fortnightly, and こくご水族館 every 10 days. Most recently, Creta Class was updated on November 7, 2026 and こくご水族館 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.*