# SkillStack vs 進数ノック

The clearest difference is update cadence: 進数ノック at daily against SkillStack's every 3 weeks. SkillStack's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. SkillStack sells 7 in-app purchases, starting at $5.99 per month and 進数ノック sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

SkillStack ships an update every 3 weeks, 進数ノック daily. The most recent releases landed on October 17, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | SkillStack | 進数ノック |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Size | 50 MB | 6 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MINATRY](https://appshunter.io/developer/1893323595) | [Hikaru Hakata](https://appshunter.io/developer/6796209163) |

## What reviewers say

### SkillStack

[App page](https://appshunter.io/ios/app/skillstack-it/id6762196789)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム（月額） | $5.99 | per month |
| プレミアム3ヶ月プラン | $17.99 | per 3 months |
| プレミアム（年額） | $59.99 | per year |
| AIクレジット お試し | $1.99 | one-time |
| AIクレジット スタンダード | $2.99 | one-time |
| AIクレジット お得 | $5.99 | one-time |
| AIクレジット プロ | $11.99 | one-time |


### 進数ノック

[App page](https://appshunter.io/ios/app/radixdrill/id6796209161)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告非表示 | $1.99 | one-time |


## Frequently asked questions

### Is SkillStack free?

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

### Is 進数ノック free?

進数ノック is free to download, with in-app purchases available.

### Do SkillStack or 進数ノック have ads?

Neither SkillStack nor 進数ノック shows ads.

### Which is updated more often, SkillStack or 進数ノック?

SkillStack ships an update every 3 weeks, and 進数ノック daily. Most recently, SkillStack was updated on October 17, 2026 and 進数ノック on October 19, 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.*