# Debt Clock vs 化学マスター

The clearest difference is in-app purchases: 化学マスター at none against Debt Clock's 2. 化学マスター also leads on ads (none vs shown). Debt Clock's advantage is iOS requirement (13.0 vs 18.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Debt Clock sells 2 in-app purchases, starting at $1.99 per month. 化学マスター asks for nothing beyond the download.

Debt Clock ships an update every 2 days, 化学マスター every 4 days. The most recent releases landed on September 13, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Debt Clock | 化学マスター |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 4 days |
| Size | 25 MB | 9 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kanta Osumi](https://appshunter.io/developer/1872595837) | [ryo otsuka](https://appshunter.io/developer/6788628020) |

## What reviewers say

### Debt Clock

[App page](https://appshunter.io/ios/app/debt-clock/id6758671250)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン（月額） | $1.99 | per month |
| プレミアムプラン（年額） | $14.99 | per year |


### 化学マスター

[App page](https://appshunter.io/ios/app/id6788745347)

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

**In-app purchases:** none


## Frequently asked questions

### Is Debt Clock free?

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

### Is 化学マスター free?

化学マスター is free to download, with no in-app purchases.

### Do Debt Clock or 化学マスター have ads?

Debt Clock shows ads; 化学マスター does not.

### Which is updated more often, Debt Clock or 化学マスター?

Debt Clock ships an update every 2 days, and 化学マスター every 4 days. Most recently, Debt Clock was updated on September 13, 2026 and 化学マスター on September 12, 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.*