# Old Japanese Clock vs CheckTimeYo

The clearest difference is price: CheckTimeYo at Free against Old Japanese Clock's $3.99. CheckTimeYo also leads on update cadence (every 6 weeks vs every 3 months). Old Japanese Clock's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.4). On ads and in-app purchases there is nothing between them.

CheckTimeYo is free to download; Old Japanese Clock costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Old Japanese Clock ships an update every 3 months, CheckTimeYo every 6 weeks. The most recent releases landed on September 22, 2026 and December 2, 2025 respectively.

## The numbers

| Metric | Old Japanese Clock | CheckTimeYo |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/old-japanese-clock/id852909242/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Paid | — |
| Size | 9 MB | 12 MB |
| Requires iOS | **15.0** | 17.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Takafumi AMANO](https://appshunter.io/developer/581065340) | [Masayoshi Ueda](https://appshunter.io/developer/1688525453) |

## What reviewers say

### Old Japanese Clock

[App page](https://appshunter.io/ios/app/old-japanese-clock/id852909242)

Convert between modern and historical Japanese timekeeping systems. Explore fixed and temporal hour systems used from the Nara to Edo eras. Useful for historical document analysis and recreating ancient Japanese lifestyles.

**Highlights:** Converts between modern and old Japanese time, Fixed hour system with six types, Temporal hour system with seven types, Supports Engishiki, Guchureki, and more, Useful for historical document analysis, Aids in adjusting Japanese clocks (Wadokei)

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

**In-app purchases:** none


### CheckTimeYo

[App page](https://appshunter.io/ios/app/checktimeyo/id6504262821)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Old Japanese Clock free?

Old Japanese Clock costs $3.99, with no in-app purchases.

### Is CheckTimeYo free?

CheckTimeYo is free to download, with no in-app purchases.

### Do Old Japanese Clock or CheckTimeYo have ads?

Neither Old Japanese Clock nor CheckTimeYo shows ads.

### Which is updated more often, Old Japanese Clock or CheckTimeYo?

Old Japanese Clock ships an update every 3 months, and CheckTimeYo every 6 weeks. Most recently, Old Japanese Clock was updated on September 22, 2026 and CheckTimeYo on December 2, 2025.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*