# HTMLの教科書 vs Oracle Java SE 21 Developer

The clearest difference is price: Oracle Java SE 21 Developer at Free against HTMLの教科書's $1.99. HTMLの教科書's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Oracle Java SE 21 Developer is free to download; HTMLの教科書 costs $1.99 up front. Oracle Java SE 21 Developer sells 1 one-off in-app purchase. HTMLの教科書 asks for nothing beyond the download.

## The numbers

| Metric | HTMLの教科書 | Oracle Java SE 21 Developer |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 4 days |
| Size | 21 MB | 201 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Creatopia Inc.](https://appshunter.io/developer/1523447963) | [CHOI SEONGMIN](https://appshunter.io/developer/6772332527) |

## What reviewers say

### HTMLの教科書

[App page](https://appshunter.io/ios/app/html/id6739200605)

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

**In-app purchases:** none


### Oracle Java SE 21 Developer

[App page](https://appshunter.io/ios/app/oracle-java-se-21-developer/id6785110070)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $4.99 | one-time |


## Frequently asked questions

### Is HTMLの教科書 free?

HTMLの教科書 costs $1.99, with no in-app purchases.

### Is Oracle Java SE 21 Developer free?

Oracle Java SE 21 Developer is free to download, with in-app purchases available.

### Do HTMLの教科書 or Oracle Java SE 21 Developer have ads?

Neither HTMLの教科書 nor Oracle Java SE 21 Developer shows ads.

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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.*