# 進数・補数変換 vs Oracle Java SE 21 Developer

The clearest difference is in-app purchases: 進数・補数変換 at none against Oracle Java SE 21 Developer's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Oracle Java SE 21 Developer sells 1 one-off in-app purchase. 進数・補数変換 asks for nothing beyond the download.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 2, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 進数・補数変換 | Oracle Java SE 21 Developer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Size | 3 MB | 209 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Manato Abe](https://appshunter.io/developer/1766487879) | [CHOI SEONGMIN](https://appshunter.io/developer/6772332527) |

## What reviewers say

### 進数・補数変換

[App page](https://appshunter.io/ios/app/id6702007723)

**Features:** macOS Compatibility

**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 進数・補数変換 free?

進数・補数変換 is free to download, 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 進数・補数変換 or Oracle Java SE 21 Developer have ads?

Neither 進数・補数変換 nor Oracle Java SE 21 Developer shows ads.

### Which is updated more often, 進数・補数変換 or Oracle Java SE 21 Developer?

進数・補数変換 ships an update weekly, and Oracle Java SE 21 Developer weekly. Most recently, 進数・補数変換 was updated on October 2, 2026 and Oracle Java SE 21 Developer on October 9, 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.*