# Inner Clock Master vs One Second Challenge

The clearest difference is update cadence: Inner Clock Master at every 4 days against One Second Challenge's every 6 weeks. On price, ads, in-app purchases and device support there is nothing between them.

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

Inner Clock Master ships an update every 4 days, One Second Challenge every 6 weeks. The most recent releases landed on September 22, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Inner Clock Master | One Second Challenge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 6 weeks |
| Size | 19 MB | 1 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ryoma Yanagimoto](https://appshunter.io/developer/1681944215) | [THEJ KUMAR SIDDHOTAM ARULRAJ](https://appshunter.io/developer/1781177167) |

## What reviewers say

### Inner Clock Master

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

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

**In-app purchases:** none


### One Second Challenge

[App page](https://appshunter.io/ios/app/one-second-challenge/id6768998129)

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

**In-app purchases:** none


## Frequently asked questions

### Is Inner Clock Master free?

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

### Is One Second Challenge free?

One Second Challenge is free to download, with no in-app purchases.

### Do Inner Clock Master or One Second Challenge have ads?

Neither Inner Clock Master nor One Second Challenge shows ads.

### Which is updated more often, Inner Clock Master or One Second Challenge?

Inner Clock Master ships an update every 4 days, and One Second Challenge every 6 weeks. Most recently, Inner Clock Master was updated on September 22, 2026 and One Second Challenge on September 10, 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.*