# X秒ぴったりチャレンジ vs Inner Clock Master

The clearest difference is device support: X秒ぴったりチャレンジ at 3 against Inner Clock Master's 1. X秒ぴったりチャレンジ also leads on iOS requirement (12.0 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

X秒ぴったりチャレンジ ships an update every 5 days, Inner Clock Master every 4 days. The most recent releases landed on September 9, 2026 and May 19, 2026 respectively.

## The numbers

| Metric | X秒ぴったりチャレンジ | Inner Clock Master |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 4 days** |
| Size | 34 MB | 19 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [KnotNest](https://appshunter.io/developer/1813321541) | [Ryoma Yanagimoto](https://appshunter.io/developer/1681944215) |

## What reviewers say

### X秒ぴったりチャレンジ

[App page](https://appshunter.io/ios/app/x-and/id6746489861)

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

**In-app purchases:** none


### Inner Clock Master

[App page](https://appshunter.io/ios/app/inner-clock-master/id6757979617)

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

**In-app purchases:** none


## Frequently asked questions

### Is X秒ぴったりチャレンジ free?

X秒ぴったりチャレンジ is free to download, with no in-app purchases.

### Is Inner Clock Master free?

Inner Clock Master is free to download, with no in-app purchases.

### Do X秒ぴったりチャレンジ or Inner Clock Master have ads?

Neither X秒ぴったりチャレンジ nor Inner Clock Master shows ads.

### Which is updated more often, X秒ぴったりチャレンジ or Inner Clock Master?

X秒ぴったりチャレンジ ships an update every 5 days, and Inner Clock Master every 4 days. Most recently, X秒ぴったりチャレンジ was updated on September 9, 2026 and Inner Clock Master on May 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.*